personality test \n faceup/facedown prediction of number of cards, weird, cato related, personality type presentation \n bob hummer \n personality test \n bob hummer \n personality quest \n lorenz schär \n strike out \n steve beam \n personalized personality test \n steve beam \n the randomized lie detector \n steve beam
1945
3 pets
Bob Hummer

Personality Test

VariationsAlso published here

1945


1



hummer's 18 card mystery \n spectator takes eighteen cards and turns over the top two cards and cuts the pile, that step is repeated as often as he likes, then the performer takes the cards behind his back and divines the amount of reversed cards, see collected secrets for links to variations \n bob hummer \n hummer's 18 card mystery \n bob hummer
1946
face up face down mysteries
Bob Hummer

Hummer's 18 Card Mystery

Also published here

1946


1



hummer's swindle \n spectator takes sixteen cards and turns over the top two cards and cuts the pile behind his back, that step is repeated as often as he likes, then the performer takes the cards behind his back and without looking reverses all cards back in order \n bob hummer \n hummer's swindle \n bob hummer
1946
face up face down mysteries
Bob Hummer

Hummer's Swindle

Also published here

1946


2



the lonely card \n cato routine, cards turned face up, performer takes packet behind back and reverses all cards except selection \n bob hummer \n the lonely card \n bob hummer \n return of the lonely card \n peter duffie \n robin robertson \n which way? \n peter a. mcdonald \n der "sex"test \n ronald a. wohl (ravelli) \n return of the lonely card \n peter duffie \n robin robertson \n fingertip sensitivity \n roberto giobbi \n bob hummer \n fingertip sensitivity \n roberto giobbi \n bob hummer
1946
face up face down mysteries
Bob Hummer

The Lonely Card

Variations Which Way? (Peter A. McDonald, 1950)
 Der "Sex"Test (Ronald A. Wohl (Ravelli), 1956)
 Return of the Lonely Card (Peter Duffie, Robin Robertson, 2002)
 Return of the Lonely Card (Peter Duffie, Robin Robertson, 2004)
 Fingertip Sensitivity (Roberto Giobbi, Bob Hummer, 2006)
 Fingertip Sensitivity (Roberto Giobbi, Bob Hummer, 2006)
Also published here

1946


2



the little moonies \n cato routine, cards with moon faces printed on them, one way they are smiling held the other way the are sad, spectator marks two cards on the pack and cuts them in the deck, performer takes cards behind back, all moons are in smiling orientation except marked two \n bob hummer \n the little moonies \n bob hummer \n the little moonies \n bob hummer
1946
face up face down mysteries
Bob Hummer

The Little Moonies

Also published here

1946


3



the stubborn card \n no. 46 \n bob hummer
1950
scarne on card tricks
Bob Hummer

The Stubborn Card

1950


81



color scheme \n no. 47, cards mixed face up/down, spectator separates face up/down, as well as red/black \n oscar weigle \n still scheming \n peter duffie \n color scheme \n oscar weigle
1950
scarne on card tricks
Oscar Weigle

Color Scheme

VariationsAlso published here

1950


83



which way? \n almost the same as lonley card \n peter a. mcdonald \n the lonely card \n bob hummer
1950
hokus pokus
Peter A. McDonald

Which Way?

Inspired by

1950


35



hummer's reversal mystery \n cato trick, magician can name correctly number of face up cards after cut and turn over procedure. oscar weigle variation: colors are also separated \n bob hummer \n oscar weigle \n the little moonies \n bob hummer \n stitches in time \n stephen tucker
1956
mathematics, magic and mystery
Bob Hummer, Oscar Weigle

Hummer's Reversal Mystery

Variations

1956


17



the little moonies \n cato trick, uses cards with drawing of either smiling/frowning face. two cards are marked on the back and after mixing, shown to be the only ones frowning while other cards are smiling \n bob hummer \n hummer's reversal mystery \n bob hummer \n oscar weigle \n the little moonies \n bob hummer
1956
mathematics, magic and mystery
Bob Hummer

The Little Moonies

Inspired byAlso published here

1956


19



der "sex"test \n eight cards, cato under table, only queen among jacks and kings ends up reversed \n ronald a. wohl (ravelli) \n the lonely card \n bob hummer
1956
hokus pokus
Ronald A. Wohl (Ravelli)

Der "Sex"Test

Inspired by

1956


444



hummer addition \n spectator reverses some cards, below table magician reverses more so named total is achieved, as kicker all are one color \n harry lorayne \n face up prediction \n bob hummer \n hummer addition \n harry lorayne
1965
my favorite card tricks
Harry Lorayne

Hummer Addition

Inspired byAlso published here

1965


30



all but one \n cato red black separation routine, p. 241 for further reference \n robert page \n p. 240 for variation by walter setty \n the lonely card \n bob hummer
1968
the pallbearers review vol. 14
Robert Page

All But One

Related to

Aug. 1968


197



paradox papers \n paper with numbers in a 4x4 grid is folded into small square, edges cut off, then all even numbers are one way and the odds another, application with cards, steve shimm suggestion, tapestry handling, see also p. 521 for gene nielson handling, h. e. dudeney \n martin gardner \n foldover notes \n karl fulves \n disparity \n ramón riobóo \n news test \n edmund rowland \n paper folding note \n karl fulves \n paradox papers \n martin gardner \n wraparound \n karl fulves \n henry dudeny puzzle from "modern puzzles" (1926) \n paradox redux \n philip t. goldstein \n folding numbers \n jack avis \n the core \n pit hartling
1971
the pallbearers review vol. 58
Martin Gardner

Paradox Papers

Inspired by Henry Dudeny puzzle from "Modern Puzzles" (1926)
Related toVariationsAlso published here

July 1971


429



hummer  4 \n four cards mixed face up face down by spectator, values of face up cards predicted, cato \n charles hudson \n number hummer \n robert e. neale
1972
epilogue
Charles Hudson

Hummer  4

Related to

Nov. 1972


150



number hummer \n four cards mixed face up face down by spectator, values of face up cards divined or predicted \n robert e. neale \n hummer  4 \n charles hudson \n toddler \n philip t. goldstein \n robert e. neale \n "baby hummer" (charles hudson, linking ring)
1973
the pallbearers review vol. 58
Robert E. Neale

Number Hummer

Inspired byRelated to

Feb. 1973


600



color scheme \n with faceup/facedown mix of twenty cards behind spectator's back \n oscar weigle \n color scheme \n oscar weigle \n addenda \n karl fulves \n further ideas \n martin gardner \n clayton rawson \n this is it \n bob hummer
1974
the pallbearers review vol. 910
Oscar Weigle

Color Scheme

Related toVariationsAlso published here

Apr. 1974


724



addenda \n handling variation \n karl fulves \n color scheme \n oscar weigle
1974
the pallbearers review vol. 910
Karl Fulves

Addenda

Inspired by

Apr. 1974


725



further ideas \n \n martin gardner \n clayton rawson \n color scheme \n oscar weigle
1974
the pallbearers review vol. 910
Martin Gardner, Clayton Rawson

Further Ideas

Inspired by

Apr. 1974


726



type casting \n faceup/facedown prediction of number of cards, weird, cato related \n karl fulves \n 54 \n karl fulves \n personality test \n bob hummer
1979
four color problems
Karl Fulves

Type Casting

Related toAlso published here

1979


23



symbolike \n two sets of esp cards are placed faceup and face down into a pile and are further mixed, when divided into two piles both have same amount of face up cards, when assembled again five esp cards are faceup and five facedown \n howard a. adams
1979
oicufesp
Howard A. Adams

Symbolike

1979

OICUFESP
(Issue 2  ten MORE brand new esp card miracles)

3



esp oil water \n with cards face up and face down \n howard a. adams
1979
oicufesp
Howard A. Adams

ESP Oil Water

1979

OICUFESP
(Issue 2  ten MORE brand new esp card miracles)

6



esp baby hummer \n card that ends up as only reversed card in packet after mixing procedure is prediction \n nick trost
1979
esp card magic
Nick Trost

ESP Baby Hummer

1979


2



lone impromptu \n cards mixed faceup and facedown, performer rightens them behind back except for selection \n karl fulves \n the lonely card \n bob hummer
1980
color quik
Karl Fulves

Lone Impromptu

Inspired by

1980


29



hummer's 18 card mystery \n spectator takes eighteen cards and turns over the top two cards and cuts the pile, that step is repeated as often as he likes, then the performer takes the cards behind his back and divines the amount of reversed cards \n bob hummer \n still scheming \n peter duffie \n informant \n karl fulves \n 37 threes \n karl fulves \n the rule for red \n karl fulves \n hummer's 18 card mystery \n bob hummer \n fingertip sensitivity \n roberto giobbi \n bob hummer \n fingertip sensitivity \n roberto giobbi \n bob hummer
1980
bob hummer's collected secrets
Bob Hummer

Hummer's 18 Card Mystery

Related toVariationsAlso published here

1980


7



hummer's swindle \n spectator takes sixteen cards and turns over the top two cards and cuts the pile behind his back, that step is repeated as often as he likes, then the performer takes the cards behind his back and without looking reverses all cards back in order \n bob hummer \n hummer's swindle \n bob hummer
1980
bob hummer's collected secrets
Bob Hummer

Hummer's Swindle

Also published here

1980


7



the lonely card \n cato routine, cards turned face up, performer takes packet behind back and reverses all cards except selection \n bob hummer \n all but one \n robert page \n lone impromptu \n karl fulves \n the lonely card \n bob hummer
1980
bob hummer's collected secrets
Bob Hummer

The Lonely Card

Related toVariationsAlso published here

1980


7



the little moonies \n cato routine, cards with moon faces printed on them, one way they are smiling held the other way the are sad, spectator marks two cards on the pack and cuts them in the deck, performer takes cards behind back, all moons are in smiling orientation except marked two \n bob hummer \n the little moonies \n bob hummer
1980
bob hummer's collected secrets
Bob Hummer

The Little Moonies

Also published here

1980


8



personality test \n faceup/facedown prediction of number of cards, weird, cato related, personality type presentation \n bob hummer \n type casting \n karl fulves \n triple humdinger \n peter duffie \n personality test \n bob hummer
1980
bob hummer's collected secrets
Bob Hummer

Personality Test

Related toVariationsAlso published here

1980


14



power play \n instruction game ten card poker deal \n karl fulves
1980
bob hummer's collected secrets
Karl Fulves

Power Play

1980


63



sum hummer \n ace to ten packet, mixed face up and down by spectator, number of reversed cards and their total predicted, cato principle \n charles hudson \n a couple of pages \n harry lorayne \n sum hummer explored \n richard vollmer
1982
best of friends
Charles Hudson

Sum Hummer

Variations

1982


105



the royal computer \n kings and queens are given to spectator for cato procedure, two card turned over, two previous selections \n charles hudson \n spur of the moment \n harry lorayne
1982
best of friends
Charles Hudson

The Royal Computer

Variations

1982


109



the dating game \n no. 3, spectator turns cards over, at the end only a kingqueen pair is faceup \n karl fulves \n odd color out \n karl fulves
1984
more selfworking card tricks
Karl Fulves

The Dating Game

Inspired by

1984


4



odd color out \n no. 19, cards shuffled faceup/facedown via cato by spectator, two selections made, performer handles cards and all faceup cards are red with a black selection and vice versa \n karl fulves \n the dating game \n karl fulves
1984
more selfworking card tricks
Karl Fulves

Odd Color Out

Variations

1984


27



immer bereit, anruf genügt! \n pinup girl cards, sixteen cards, list with numbers, chosen card/girl eventually divined with layout on table \n bob hummer \n rudolf braunmüller
1984
intermagic
Bob Hummer, Rudolf Braunmüller

Immer bereit, Anruf genügt!

Jan. 1984


119



clubbed \n in one half selection turns over, in other half all cards from the same suit are found reversed \n aldo colombini
1985
the trapdoor — volume one
Aldo Colombini

Clubbed

1985


187



paradox papers \n no. 9, paper with numbers in a 4x4 grid is folded into small square, edges cut off, then all even numbers are one way and the odds another, application with card values on paper or card layout (chosen card turned over is only oddcolored at the end) \n martin gardner \n paradox papers \n martin gardner
1985
selfworking paper magic
Martin Gardner

Paradox Papers

Also published here

1985


18



hummer addition \n spectator reverses some cards, below table magician reverses more so named total is achieved, as kicker all are one color \n harry lorayne \n hummer addition \n harry lorayne
1987
intermagic
Harry Lorayne

Hummer Addition

Also published here

Oct. 1987


38



toddler \n packet mixed faceup/facedown, values added up is force number \n philip t. goldstein \n robert e. neale \n "baby hummer" (charles hudson, linking ring) \n number hummer \n robert e. neale
1989
fifth
Philip T. Goldstein, Robert E. Neale

Toddler

Inspired by "Baby Hummer" (Charles Hudson, Linking Ring)
Variations

1989


3



parity prophet \n cards dealt in pairs, one turned over, again dealt in pairs, cards on both side of reversed card are mates or predicted, gemini twins relation \n karl fulves \n magnetic force \n karl fulves \n parity prediction \n reinhard müller
1993
rigmarole
Karl Fulves

Parity Prophet

Related toVariations

1993


45



principles and deceptions \n "an easy trip through the arithmetical principles of card magic  part 4"
 two unique principles of bob hummer
 principle one
 principle two (cato) \n peter duffie
1993
profile
Peter Duffie

Principles and Deceptions

Oct. 1993


6



card prediction \n faceup cards after cato mixing added, card at that position in rest of deck predicted \n peter duffie
1993
profile
Peter Duffie

Card Prediction

Dec. 1993


5



basic hummer \n four cards, selection is only one reversed after some procedure \n unknown \n "baby hummer" (charles hudson, linking ring) \n basic hummer \n unknown
1993
card file

Basic Hummer

Inspired by "Baby Hummer" (Charles Hudson, Linking Ring)
Also published here

1993


72



beyond hummer \n four cards, selection is only one reversed after some procedure \n persi diaconis \n beyond hummer \n persi diaconis
1993
card file
Persi Diaconis

Beyond Hummer

Also published here

1993


74



day one \n date chosen by choosing some faceup and facedown cards from grid layout, looked up in diary, card noted there predicted, tapestry \n karl fulves \n three card tricks \n mel bennett
1994
crooked tales
Karl Fulves

Day One

Variations

1994


35



triumph with math \n tapestry layout and foldover \n karl fulves
1994
crooked tales
Karl Fulves

Triumph With Math

1994


39



foldover notes \n \n karl fulves \n paradox papers \n martin gardner
1994
crooked tales
Karl Fulves

Foldover Notes

Related to

1994


40



moves and removes \n marker moved on 3x3 layout, final card predicted, with 4x4 "sixteen card version" on p. 30 \n simon aronson \n martin gardner presents (1993), p. 149
1995
simply simon
Simon Aronson

Moves and Removes

Related to Martin Gardner Presents (1993), p. 149

1995


19



pasteboard detection \n mathematical, cato \n peter duffie
1996
apocalypse
Peter Duffie

Pasteboard Detection

May 1996


2645



still scheming \n play it straight triumph type of effect with cato procedure, use half a deck \n peter duffie \n color scheme \n oscar weigle \n hummer's 18 card mystery \n bob hummer
1997
effortless card magic
Peter Duffie

Still Scheming

Inspired by

1997


144



paradox redux \n  "dot com  tricks and stunts with numbers"
tapestry parity principle, credit information, 4x4 number matrix, 19 or 61 \n philip t. goldstein \n paradox papers \n martin gardner
1998
the fine print
Philip T. Goldstein

Paradox Redux

Inspired by

1998


247



cutrate hummer \n  "dot com  tricks and stunts with numbers"
twenty cards spread, about five are reversed, spectator remembers one and turns it over, something done behind back by performer, selection located and other reversed cards are now aces \n karl fulves \n hofzinser + math \n karl fulves
1998
the fine print
Karl Fulves

CutRate Hummer

Variations

1998


285



intuitive \n cards with colored spots and numbers, some selected, a prediction is matched \n peter duffie \n triple humdinger \n peter duffie
1998
five times five — scotland
Peter Duffie

Intuitive

Related to

1998


54



solohummer \n packet mixed with cato procedure by spectator under table, one card remembered, performer sorts all except selection \n david solomon \n "hummer outdone" (ken simmons, choice effects no. 5) \n ed marlo version in ibidem #12
1998
onyx
David Solomon

SoloHummer

Inspired by "Hummer Outdone" (Ken Simmons, Choice Effects No. 5)
Related to Ed Marlo version in Ibidem #12

Apr. 1998


3



letter perfect \n spectator mixes stack of alphabet cards face up/down, the face down cards spell his/her name \n david regal
1999
closeup & personal
David Regal

Letter Perfect

1999


88



37 threes \n  "dot com  tricks and stunts with numbers"
small packet, spectator cuts and turns over pairs, then two red threes are only reversed cards, comedy prediction is shown to fit \n karl fulves \n informant \n karl fulves \n hummer's 18 card mystery \n bob hummer
1999
the fine print
Karl Fulves

37 Threes

Related to

1999


348



basic hummer \n baby hummer, four cards flipped face up and down, end with selection being the only one reversed. \n unknown \n basic hummer \n unknown \n baby hummer \n charles hudson
1999
cunning card miracles

Basic Hummer

Related toAlso published here

1999


37



beyond hummer \n variation on basic hummer \n persi diaconis \n beyond hummer \n persi diaconis
1999
cunning card miracles
Persi Diaconis

Beyond Hummer

Also published here

1999


39



hummer  odd back \n basic hummer, but selected card is reversed and also oddbacked \n tom craven \n hummer  odd back \n tom craven
1999
cunning card miracles
Tom Craven

Hummer  Odd Back

Also published here

1999


41



hummer cleanup \n cleanup for baby hummer (1 2 3 4 turnover) \n tom craven \n hummer cleanup \n tom craven
1999
cunning card miracles
Tom Craven

Hummer Cleanup

Also published here

1999


44



canning's baby hummer \n baby hummer using six cards \n doug canning \n canning's baby hummer \n doug canning
1999
cunning card miracles
Doug Canning

Canning's Baby Hummer

Also published here

1999


45



hofzinser + math \n aces shuffled reversed into packet, another card chosen, faceup/facedown mix, all cards right except a chosen ace but selection instead \n karl fulves \n cutrate hummer \n karl fulves \n surprise ace triumph \n reinhard müller \n automatic ace triumph \n kuniyasu fujiwara
2000
latter day secrets
Karl Fulves

Hofzinser + Math

Inspired byRelated to

2000


55



symmetry \n comment on the fujiwara effect, two card location \n karl fulves \n automatic ace triumph \n kuniyasu fujiwara
2000
latter day secrets
Karl Fulves

Symmetry

Related to

2000


56



place the aces \n twentycard packet mixed faceup/facedown, all cards right except aces \n karl fulves
2000
latter day secrets
Karl Fulves

Place The Aces

2000


56



hummer cleanup \n four cards, selection is only one reversed after some procedure \n tom craven \n "baby hummer" (charles hudson, linking ring) \n hummer cleanup \n tom craven
2000
card file two
Tom Craven

Hummer CleanUp

Inspired by "Baby Hummer" (Charles Hudson, Linking Ring)
Also published here

2000


69



hummer  odd back \n selection also has odd back \n tom craven \n "baby hummer" (charles hudson, linking ring) \n hummer  odd back \n tom craven
2000
card file two
Tom Craven

Hummer  Odd Back

Inspired by "Baby Hummer" (Charles Hudson, Linking Ring)
Also published here

2000


70



canning's baby hummer \n with six cards \n doug canning \n "baby hummer" (charles hudson, linking ring) \n canning's baby hummer \n doug canning
2000
card file two
Doug Canning

Canning's Baby Hummer

Inspired by "Baby Hummer" (Charles Hudson, Linking Ring)
Also published here

2000


72



automatic ace triumph \n handsoff, dealing procedure, sixteen cards, parity \n kuniyasu fujiwara \n automatic ace triumph \n kuniyasu fujiwara \n hofzinser + math \n karl fulves \n symmetry \n karl fulves \n darn! i couldn't... \n harry lorayne \n surprise ace triumph \n reinhard müller \n two for the road \n peter duffie \n robin robertson \n rollover aces \n nick trost \n red and black routine \n nick trost \n really! \n harry lorayne
2000
genii
Kuniyasu Fujiwara

Automatic Ace Triumph

Related toVariationsAlso published here

May 2000


19



tomorrow's card \n no. 47, eight cards shuffled faceup/facedown, number of reversed cards and their identity predicted \n karl fulves \n "baby hummer" (charles hudson, linking ring)
2001
new selfworking card tricks
Karl Fulves

Tomorrow's Card

Inspired by "Baby Hummer" (Charles Hudson, Linking Ring)

2001


67



psychic map \n no. 69, fifteen cards in matrix layout on table, some are turned over, covered with newspaper, performer reaches underneath and adjusts, when newspaper is removed all faceup cards are red and vice versa \n karl fulves \n bob hummer
2001
new selfworking card tricks
Karl Fulves, Bob Hummer

Psychic Map

2001


104



darn! i couldn't... \n four tens on table, three cards on each, cato ("leave or reverse"), aces are only cards reversed cards in the end \n harry lorayne \n incredible flush control \n harry lorayne \n darn! i couldn't \n harry lorayne \n automatic ace triumph \n kuniyasu fujiwara
2001
personal collection
Harry Lorayne

Darn! I Couldn't...

Related toVariationsAlso published here

2001


485



a couple of pages \n sixteen cards mixed face up and down by spectator, number of reversed cards and their total predicted \n harry lorayne \n sum hummer \n charles hudson
2001
personal collection
Harry Lorayne

A Couple of Pages

Inspired by

2001


489



symbiotic \n sixteen cards shuffled faceup/facedown, aces are only cards reversed at the end, faro \n harry lorayne
2001
personal collection
Harry Lorayne

Symbiotic

2001


493



spur of the moment \n two selections are only reversed cards in packet after cato procedure \n harry lorayne \n the royal computer \n charles hudson
2001
personal collection
Harry Lorayne

Spur of the Moment

Inspired by

2001


495



another moment \n cato procedure with twelvecard packet, reversed cards at end are known, or total predicted, or... \n harry lorayne
2001
personal collection
Harry Lorayne

Another Moment

2001


499



surprise ace triumph \n aces shuffled reversed into packet, faceup/facedown mix, all cards right except the queens \n reinhard müller \n hofzinser + math \n karl fulves \n automatic ace triumph \n kuniyasu fujiwara
2001
latter day secrets
Reinhard Müller

Surprise Ace Triumph

Inspired byRelated to

2001


139



triple humdinger \n faceup/facedown prediction of number of cards in packet, three predictions \n peter duffie \n personality test \n bob hummer \n intuitive \n peter duffie \n strike out \n steve beam
2001
cards by all means
Peter Duffie

Triple Humdinger

Inspired byRelated to

2001


16



automatic poker \n ten cards are "mixed" by spectator, then redblack separated or poker deal, pseudocato \n jim steinmeyer \n deal three \n jim steinmeyer \n chapter 11  pseudocato \n peter duffie \n robin robertson
2002
impuzzibilities
Jim Steinmeyer

Automatic Poker

Related to

2002


23



the rule for red \n different handling than cato, switching two cards \n karl fulves \n hummer's 18 card mystery \n bob hummer
2002
latter day secrets
Karl Fulves

The Rule For Red

Inspired by

2002


262



tapgac \n "turn any pairs, gather and cut", alternative way of doing hummer's cato
 the tapgac fix
 end notes \n peter duffie \n robin robertson \n tapgac \n peter duffie \n robin robertson
2002
ego
Peter Duffie, Robin Robertson

TAPGAC

Also published here

May 2002


4



chao theory \n redblack separation with letter cards, using tapgac \n peter duffie \n robin robertson \n chao theory \n peter duffie \n robin robertson
2002
ego
Peter Duffie, Robin Robertson

Chao Theory

Also published here

May 2002


5



the royal clans \n redblack separation with procedure and picture cards, using tapgac \n peter duffie \n robin robertson \n the royal clans \n peter duffie \n robin robertson
2002
ego
Peter Duffie, Robin Robertson

The Royal Clans

Also published here

May 2002


7



return of the lonely card \n all reversed except selection after mixing process, using tapgac \n peter duffie \n robin robertson \n return of the lonely card \n peter duffie \n robin robertson \n the lonely card \n bob hummer
2002
ego
Peter Duffie, Robin Robertson

Return of the Lonely Card

Inspired byAlso published here

May 2002


8



princes and peasants \n redblack separation with procedure, using tapgac \n peter duffie \n robin robertson \n princes and peasants \n peter duffie \n robin robertson
2002
ego
Peter Duffie, Robin Robertson

Princes and Peasants

Also published here

May 2002


9



deduction production \n selection and rest of fourofakind eventually found, using tapgac \n peter duffie \n robin robertson \n deduction production \n peter duffie \n robin robertson
2002
ego
Peter Duffie, Robin Robertson

Deduction Production

Also published here

May 2002


10



two for the road \n after packet mixing process only five cards are faceup  a previously selected poker hand, then fulves's riffle shuffle control after which position of first selection is announced, second stabbed to
 phase i: tapgac poker
 phase ii: riffle shuffle bored \n peter duffie \n robin robertson \n two for the road \n peter duffie \n robin robertson
2002
ego
Peter Duffie, Robin Robertson

Two for the Road

Also published here

May 2002


12



hummer principle (cato) \n explanation and credit information \n peter duffie \n robin robertson
2003
card conspiracy — vol. 1
Peter Duffie, Robin Robertson

Hummer Principle (CATO)

2003


108



thought process \n selection ends up reversed in packet \n peter duffie \n robin robertson \n cato by numbers \n roy walton
2003
card conspiracy — vol. 1
Peter Duffie, Robin Robertson

Thought Process

Variations

2003


109



cato by numbers \n simplified \n roy walton \n thought process \n peter duffie \n robin robertson \n cato gets married \n peter duffie \n robin robertson
2003
card conspiracy — vol. 1
Roy Walton

CATO By Numbers

Inspired byVariations

2003


110



cato gets married \n kings and queens, in the end a matching pair ends up reversed \n peter duffie \n robin robertson \n cato by numbers \n roy walton \n cato gets married  again \n peter duffie \n robin robertson
2003
card conspiracy — vol. 1
Peter Duffie, Robin Robertson

CATO Gets Married

Inspired byVariations

2003


111



cato gets married  again \n \n peter duffie \n robin robertson \n cato gets married \n peter duffie \n robin robertson
2003
card conspiracy — vol. 1
Peter Duffie, Robin Robertson

Cato Gets Married  Again

Inspired by

2003


112



hummer plays poker \n packet mixed via cato, royal flush shows up at the end \n peter duffie \n robin robertson \n remote control poker \n peter duffie \n robin robertson \n two for the road \n peter duffie \n robin robertson
2003
card conspiracy — vol. 1
Peter Duffie, Robin Robertson

Hummer Plays Poker

Related toVariations

2003


113



remote control poker \n royal flush shows up at the end \n peter duffie \n robin robertson \n hummer plays poker \n peter duffie \n robin robertson \n two for the road \n peter duffie \n robin robertson \n the 20/20 prediction \n nick trost
2003
card conspiracy — vol. 1
Peter Duffie, Robin Robertson

Remote Control Poker

Inspired byRelated toVariations

2003


114



really! \n fourofakind ends up reversed after cato/toac procedure \n harry lorayne \n really! \n harry lorayne \n automatic ace triumph \n kuniyasu fujiwara
2003
genii
Harry Lorayne

Really!

Inspired byAlso published here

June 2003


70



degrees of freedom \n cato, koenig's tapestry, combo to produce royal flush \n john bannon \n folded discovery \n david solomon
2004
dear mr. fantasy
John Bannon

Degrees Of Freedom

Variations

2004


128



origami poker \n cato, koenig's tapestry, combo to produce royal flush \n john bannon
2004
dear mr. fantasy
John Bannon

Origami Poker

2004


144



perfect strangers \n cato, koenig's tapestry, prediction combo with rainbow packet \n john bannon \n imperfect strangers \n robin robertson \n strange but perfect \n jerry k. hartman
2004
dear mr. fantasy
John Bannon

Perfect Strangers

Variations

2004


155



postcards prediction \n cato, koenig's tapestry, prediction combo with postcards instead of playing cards \n gordon bean
2004
dear mr. fantasy
Gordon Bean

Postcards Prediction

2004


158



the works \n explanation of cato principle and the koenig's tapestry fold (dudeney folding)
 first principles
 isolating target cards
 rlues of engagement
 the folding phase \n john bannon \n disparity \n ramón riobóo
2004
dear mr. fantasy
John Bannon

The Works

Related to

2004


159



threedeal royal flush \n different method for flipflop poker \n reinhard müller
2004
semiautomatic card tricks — volume 5
Reinhard Müller

ThreeDeal Royal Flush

2004


77



chapter 11  pseudocato \n intro, cato with turning three instead of two cards over, "cato preserves the faceup/facedown orientation while mixingthe positions. in contrast, pseudocato preserves the relative odd/even alternating positions while mixing their faceup/facedown orientation." \n peter duffie \n robin robertson \n automatic poker \n jim steinmeyer
2004
diamonds from coal
Peter Duffie, Robin Robertson

Chapter 11  PseudoCATO

Related to

2004


92



guessing colors \n selection ends up in oddcolored pile, pseudocato \n peter duffie \n robin robertson
2004
diamonds from coal
Peter Duffie, Robin Robertson

Guessing Colors

2004


92



moving colors \n packet, two selections (one red, one black) end up in oddcolored pile, pseudocato \n peter duffie \n robin robertson
2004
diamonds from coal
Peter Duffie, Robin Robertson

Moving Colors

2004


93



uncertain separation \n after some mixing the cards are eventually sorted either red/black or picture/spots, pseudocato \n peter duffie \n robin robertson \n indeterminate conclusion \n peter duffie \n robin robertson
2004
diamonds from coal
Peter Duffie, Robin Robertson

Uncertain Separation

Variations

2004


95



indeterminate conclusion \n same with two selections ending up in opposite group, pseudocato \n peter duffie \n robin robertson \n uncertain separation \n peter duffie \n robin robertson
2004
diamonds from coal
Peter Duffie, Robin Robertson

Indeterminate Conclusion

Inspired by

2004


97



tapgac \n "turn any pairs, gather and cut", alternative way of doing hummer's cato
 the tapgac fix
 end notes \n peter duffie \n robin robertson \n tapgac \n peter duffie \n robin robertson
2004
diamonds from coal
Peter Duffie, Robin Robertson

TAPGAC

Also published here

2004


120



chao theory \n redblack separation with letter cards, using tapgac \n peter duffie \n robin robertson \n chao theory \n peter duffie \n robin robertson
2004
diamonds from coal
Peter Duffie, Robin Robertson

Chao Theory

Also published here

2004


122



the royal clans \n redblack separation with procedure and picture cards, using tapgac \n peter duffie \n robin robertson \n the royal clans \n peter duffie \n robin robertson
2004
diamonds from coal
Peter Duffie, Robin Robertson

The Royal Clans

Also published here

2004


123



return of the lonely card \n all reversed except selection after mixing process, using tapgac \n peter duffie \n robin robertson \n the lonely card \n bob hummer \n return of the lonely card \n peter duffie \n robin robertson
2004
diamonds from coal
Peter Duffie, Robin Robertson

Return of the Lonely Card

Inspired byAlso published here

2004


124



princes and peasants \n redblack separation with procedure, using tapgac \n peter duffie \n robin robertson \n princes and peasants \n peter duffie \n robin robertson
2004
diamonds from coal
Peter Duffie, Robin Robertson

Princes and Peasants

Also published here

2004


126



deduction production \n selection and rest of fourofakind eventually found, using tapgac \n peter duffie \n robin robertson \n deduction production \n peter duffie \n robin robertson
2004
diamonds from coal
Peter Duffie, Robin Robertson

Deduction Production

Also published here

2004


127



two for the road \n after packet mixing process only five cards are faceup  a previously selected poker hand, then fulves's riffle shuffle control after which position of first selection is announced, second stabbed to
 phase i: tapgac poker
 phase ii: riffle shuffle bored \n peter duffie \n robin robertson \n hummer plays poker \n peter duffie \n robin robertson \n remote control poker \n peter duffie \n robin robertson \n automatic ace triumph \n kuniyasu fujiwara \n two for the road \n peter duffie \n robin robertson
2004
diamonds from coal
Peter Duffie, Robin Robertson

Two for the Road

Inspired byRelated toAlso published here

2004


129



parity prediction \n cards dealt in pairs, one chosen, sandwich with another card put into pile, dealing in pairs again, then sandwiched card is selection \n reinhard müller \n parity prophet \n karl fulves
2004
discoverie
Reinhard Müller

Parity Prediction

Inspired by

2004


121



pseudo hummer \n fooling magicians who know the hummer cato trick \n karl fulves
2005
combo ii
Karl Fulves

Pseudo Hummer

2005


46



raising baby hummer \n selection is reversed, variation with oddcolored back
 offcolor baby hummer \n tom craven \n charles hudson's "baby hummer" in "the linking ring" december, 1967.
2006
semiautomatic card tricks — volume 6
Tom Craven

Raising Baby Hummer

Inspired by Charles Hudson's "Baby Hummer" in "The Linking Ring" December, 1967.

2006


72



total freedom \n five selections found after cato and mixing procedure \n michael powers
2006
power plays
Michael Powers

Total Freedom

2006


128



bummer (bob's hummer) \n  flim flammagic
packet cut off and mixed faceup/facedown, facedown cards are a royal flush, slop shuffle \n bob farmer
2006
genii
Bob Farmer

Bummer (Bob's Hummer)

July 2006


31



wringer \n eight letter cards are used to generate a word via downunder deal which is predicted in form of a picture, imploded cato \n max maven
2006
genii
Max Maven

Wringer

Aug. 2006


76



royal flush \n ten cards are shuffled face up and face down and then divided in two packets, one consists of a royal flush, paritiy \n larry jennings
2006
card college light
Larry Jennings

Royal Flush

2006


27



fingertip sensitivity \n twelve cards are mixed face up and face down, performer holds packet under table and knows how many cards are reversed and they turn out to be from same color, repeated with selection, all cards end up reversed but selection \n roberto giobbi \n bob hummer \n hummer's 18 card mystery \n bob hummer \n the lonely card \n bob hummer
2006
card college light
Roberto Giobbi, Bob Hummer

Fingertip Sensitivity

Inspired by

2006


43



fingertip sensitivity \n twelve cards are mixed face up and face down, performer holds packet under table and knows how many cards are reversed and they turn out to be from same color, repeated with selection, all cards end up reversed but selection \n roberto giobbi \n bob hummer \n hummer's 18 card mystery \n bob hummer \n the lonely card \n bob hummer
2006
card college light
Roberto Giobbi, Bob Hummer

Fingertip Sensitivity

Inspired by

2006


43



sum hummer explored \n packet mixed face up and down by spectator, number of reversed cards and their total predicted, cato principle \n richard vollmer \n sum hummer \n charles hudson \n sum hummer explored \n harry lorayne \n richard vollmer
2007
best of friends — volume iii
Richard Vollmer

Sum Hummer Explored

Inspired byVariations

2007


264



outdoing "hummer outdone" \n twenty cards shuffled faceup/facedown with cato under table by spectator, one remembered, performer rights all except selection under the table, ten double facers \n david solomon
2007
the wisdom of solomon
David Solomon

Outdoing "Hummer Outdone"

2007


167



darn! i couldn't \n four tens on table, three cards on each, cato ("leave or reverse"), aces are only cards reversed cards in the end \n harry lorayne \n darn! i couldn't... \n harry lorayne
2009
genii
Harry Lorayne

Darn! I Couldn't

Also published here

Mar. 2009


19



red and black routine \n routine with ten red and black cards
 cato type routine
 "double separation" (wiersbe)
 "unmatch" (fulves)
 "color scheme" (oscar weigle) \n nick trost \n double separation \n warren wiersbe \n bob hummer \n unmatch \n karl fulves \n "color scheme" (oscar weigle, marketed 1949) \n automatic ace triumph \n kuniyasu fujiwara
2009
subtle card creations — volume 2
Nick Trost

Red and Black Routine

Inspired by

2009


347



another rollover aces \n with grid folding \n nick trost \n rollover aces \n nick trost
2009
subtle card creations — volume 2
Nick Trost

Another RollOver Aces

Inspired by

2009


372



fourfold foresight \n "a/k/a cardzilla's amazing selfworking origami card trick"
tapestry folding with multistage prediction (as in shufflebored) \n john bannon \n origami prediction \n john bannon
2009
six. impossible. things.
John Bannon

FourFold Foresight

Variations

2009


37



faceup/facedown clairvoyant \n spectator mixes cards faceup/facedown under table and reverse counts a number, that number of cards end up reversed \n justin higham
2011
clairvoyant, mental topper and the mindreader's dream
Justin Higham

FaceUp/FaceDown Clairvoyant

2011


22



mathematics in the air \n chapter intro that describes the cato principle and the mathematics behind it, along with tricks \n persi diaconis \n ron graham \n baby hummer \n charles hudson \n hummer's ten card mystery \n bob hummer
2012
magical mathematics
Persi Diaconis, Ron Graham

Mathematics in the Air

Related to

2012


1



baby hummer \n used to demonstrate the cato principle, uses four cards \n charles hudson \n mathematics in the air \n persi diaconis \n ron graham \n basic hummer \n unknown \n baby boom \n reinhard müller
2012
magical mathematics
Charles Hudson

Baby Hummer

Related toVariations

2012


1



hummer's ten card mystery \n original use of the cato principle, based on the 18 card mystery in the original manuscript, magician can name how many face up cards there are after mixing it up \n bob hummer \n "18 card mystery" (bob hummer, faceup / facedown mysteries, 1942) \n mathematics in the air \n persi diaconis \n ron graham
2012
magical mathematics
Bob Hummer

Hummer's Ten Card Mystery

Related toAlso published here "18 Card Mystery" (Bob Hummer, Faceup / Facedown Mysteries, 1942)

2012


4



royal hummer \n cards are mixed face up and face down haphazardly, later all cards are face down except a royal flush \n steve freeman \n back to magic \n persi diaconis \n ron graham
2012
magical mathematics
Steve Freeman

Royal Hummer

Variations

2012


8



back to magic \n end of chapter, describes steve's own variation on steve freeman's handling of royal hummer \n persi diaconis \n ron graham \n royal hummer \n steve freeman
2012
magical mathematics
Persi Diaconis, Ron Graham

Back to Magic

Inspired by

2012


15



origami prediction \n tapestry folding with multistage prediction (as in shufflebored) \n john bannon \n fourfold foresight \n john bannon
2013
high caliber
John Bannon

Origami Prediction

Inspired by

2013


298



disparity \n updated handling of the dudeney parity principle. cards are dealt into a grid on the table as directed by the audience. the cards are reassembled by folding rows and columns onto each other  again controlled by the audience  yet the selections are found reversed in the packet. \n ramón riobóo \n paradox papers \n martin gardner \n the works \n john bannon
2015
semiautomatic card tricks — volume 10
Ramón Riobóo

Disparity

Related to

2015


88



matsunoma principle \n procedure which allows you to perform the petal force by mitsunobu matsuyama without a downunder deal. \n lewis jones \n pat hand \n steve beam
2015
semiautomatic card tricks — volume 9
Lewis Jones

MatsuNOma Principle

Related to

2015


81



the toplevel test \n twenty cards mixed faceup and facedown including a royal flush, royal flush is only faceup cards \n harry lorayne \n "really!" (harry lorayne, lecture notes) \n another toplevel test \n harry lorayne
2015
jawdroppers!
Harry Lorayne

The TopLevel Test

Inspired by "Really!" (Harry Lorayne, Lecture Notes)
Related to

2015


191



incredible flush control \n diamond royal flush mixed in twentycard packet, cato procedure, at the end the royal flush in spades is reversed \n harry lorayne \n darn! i couldn't... \n harry lorayne
2015
jawdroppers!
Harry Lorayne

Incredible Flush Control

Inspired by

2015


195



try this! \n mixing procedure for cato \n harry lorayne
2015
jawdroppers!
Harry Lorayne

Try This!

2015


198



sum hummer explored \n packet mixed face up and down by spectator, number of reversed cards and their total predicted, cato principle \n harry lorayne \n richard vollmer \n sum hummer explored \n richard vollmer
2017
jawdroppers! two
Harry Lorayne, Richard Vollmer

Sum Hummer Explored

Inspired by

2017


170



three new toacs \n toac = turn over and cut, all with twelvecard packet
 prediction
 one to twelve (named value of a suit only reversed at end)
 incredible 2card location \n harry lorayne
2017
jawdroppers! two
Harry Lorayne

Three New TOACS

2017


173



"that's impossible!" \n only four aces reversed after cato procedure with sixteen cards \n harry lorayne \n "really!" (harry lorayne, lecture notes)
2017
jawdroppers! two
Harry Lorayne

"That's Impossible!"

Inspired by "Really!" (Harry Lorayne, Lecture Notes)

2017


176



eight/great  nine/fine \n  one of eightcard packet remembered (force), found with cato
 one of ninecard packet remembered, found with reverse faros \n harry lorayne
2017
jawdroppers! two
Harry Lorayne

Eight/Great  Nine/Fine

2017


228



folded discovery \n 4x4 matrix layout, folding tapestry, all of one color end up reversed except selection \n david solomon \n degrees of freedom \n john bannon
2018
solomon's secrets
David Solomon

Folded Discovery

Inspired by

2018


31



really! \n fourofakind ends up reversed after cato/toac procedure \n harry lorayne \n "really!" (harry lorayne, lecture notes) \n really impossible toac \n harry lorayne \n really! \n harry lorayne
2018
and finally!
Harry Lorayne

Really!

VariationsAlso published here

2018


75



shy or showoff \n many spectators, each spectator takes four cards, cato principle (baby hummer) \n ramón riobóo \n "baby hummer" (nick trost) \n baby hummer \n charles hudson
2019
second thoughts
Ramón Riobóo

Shy or Showoff

Inspired byRelated to "Baby Hummer" (Nick Trost)

2019


63



cards that manifest themselves \n self working triumph, based on parity principle, cards mixed face up and down restore, leaving only the selected cards reversed \n ramón riobóo \n my packetturnover shuffle \n ramón riobóo
2019
second thoughts
Ramón Riobóo

Cards That Manifest Themselves

Related to

2019


105



baby boom \n with four cards \n reinhard müller \n baby hummer \n charles hudson
2020
semiautomatic card tricks — volume 12
Reinhard Müller

Baby Boom

Inspired by

2020


179



personality quest \n faceup/facedown prediction of number of cards, minor variation of hummer's personality test \n lorenz schär \n personality test \n bob hummer
2020
semiautomatic card tricks — volume 12
Lorenz Schär

Personality Quest

Inspired by

2020


180



strike out \n faceup/facedown prediction of number of cards \n steve beam \n personality test \n bob hummer \n triple humdinger \n peter duffie
2020
semiautomatic card tricks — volume 12
Steve Beam

Strike Out

Inspired byRelated to

2020


181



personalized personality test \n faceup/facedown prediction of number of cards \n steve beam \n personality test \n bob hummer
2020
semiautomatic card tricks — volume 12
Steve Beam

Personalized Personality Test

Inspired by

2020


183



the randomized lie detector \n faceup/facedown cards to form a number and to find selection \n steve beam \n personality test \n bob hummer
2020
semiautomatic card tricks — volume 12
Steve Beam

The Randomized Lie Detector

Inspired by

2020


184



on baby hummer \n chosen ace ends up reversed after performer does some arranging behind his back \n jon racherbaumer \n "baby hummer" (charles hudson, linking ring, dec. 1967)
2020
genii
Jon Racherbaumer

On Baby Hummer

Inspired by "Baby Hummer" (Charles Hudson, Linking Ring, Dec. 1967)

Feb. 2020


47



really impossible toac \n "turn over and cut", fourofakind ends up reversed after cato/toac procedure \n harry lorayne \n really! \n harry lorayne
2020
more jaw droppers!
Harry Lorayne

Really Impossible TOAC

Inspired by

2020


51



every card you take, i'll be watching you \n five cards chosen, spectators mix cards faceup/facedown, only selections end up reversed \n sylvain juzan
2021
every card you take
Sylvain Juzan

Every Card You Take, I'll Be Watching You

2021


14



baby hummer redux \n  exhumations \n jon racherbaumer \n "baby hummer" (charles hudson, the linking ring, dec. 1967)
2022
genii
Jon Racherbaumer

Baby Hummer Redux

Inspired by "Baby Hummer" (Charles Hudson, The Linking Ring, Dec. 1967)

Mar. 2022


39



leave or reverse \n \n steve freeman
2023
genii
Steve Freeman

Leave or Reverse

Jan. 2023


42


