123 entries in Cards / Principles / Binary / CATO & Parity
  
Creators Title Comments & References Year Source Page AA Categories
Bob Hummer Personality Test face-up/face-down prediction of number of cards, weird, CATO related, personality type presentation
VariationsAlso published here 1945 3 Pets 1
Bob Hummer Hummer's 18 Card Mystery 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
Also published here 1946 Face Up Face Down Mysteries 1
Bob Hummer Hummer's Swindle 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
Also published here 1946 Face Up Face Down Mysteries 2
Bob Hummer The Lonely Card CATO routine, cards turned face up, performer takes packet behind back and reverses all cards except selection
VariationsAlso published here 1946 Face Up Face Down Mysteries 2
Bob Hummer The Little Moonies 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
Also published here 1946 Face Up Face Down Mysteries 3
Bob Hummer The Stubborn Card No. 46
1950 Scarne on Card Tricks 81
Oscar Weigle Color Scheme No. 47, Cards mixed face up/down, spectator separates face up/down, as well as red/black
VariationsAlso published here 1950 Scarne on Card Tricks 83
Bob Hummer, Oscar Weigle Hummer's Reversal Mystery CATO trick, magician can name correctly number of face up cards after cut and turn over procedure. Oscar Weigle variation: colors are also separated
Variations 1956 Mathematics, Magic And Mystery 17
Bob Hummer The Little Moonies 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
Inspired byAlso published here 1956 Mathematics, Magic And Mystery 19
Harry Lorayne Hummer Addition spectator reverses some cards, below table magician reverses more so named total is achieved, as kicker all are one color
Inspired by 1965 My Favorite Card Tricks 30
Robert Page All But One CATO red black separation routine, p. 241 for further reference
Related to Aug. 1968 The Pallbearers Review Vol. 1-4 (Vol. 3 No. 10) 197
Martin Gardner Paradox Papers 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
Inspired by
  • Henry Dudeny puzzle from "Modern Puzzles" (1926)
Related toVariationsAlso published here
July 1971 The Pallbearers Review Vol. 5-8 (Vol. 6 No. 9) 429
Charles Hudson Hummer - 4 four cards mixed face up face down by spectator, values of face up cards predicted, CATO
Related to 1972 Epilogue (Issue 16) 150
Robert E. Neale Number Hummer four cards mixed face up face down by spectator, values of face up cards divined or predicted
Inspired byRelated to Feb. 1973 The Pallbearers Review Vol. 5-8 (Vol. 8 No. 4) 600
Oscar Weigle Color Scheme with face-up/face-down mix of twenty cards behind spectator's back
Related toVariationsAlso published here Apr. 1974 The Pallbearers Review Vol. 9-10 (Vol. 9 No. 6) 724
Karl Fulves Addenda handling variation
Inspired by Apr. 1974 The Pallbearers Review Vol. 9-10 (Vol. 9 No. 6) 725
Martin Gardner, Clayton Rawson Further Ideas
Inspired by Apr. 1974 The Pallbearers Review Vol. 9-10 (Vol. 9 No. 6) 726
Karl Fulves Type Casting face-up/face-down prediction of number of cards, weird, CATO related
Related toAlso published here 1979 Four Color Problems 23
Howard A. Adams Symbolike two sets of ESP cards are placed face-up 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 face-up and five face-down
1979 OICUFESP (Issue 2 - ten MORE brand new esp card miracles) 3
Howard A. Adams ESP Oil Water with cards face up and face down
1979 OICUFESP (Issue 2 - ten MORE brand new esp card miracles) 6
Karl Fulves Lone Impromptu cards mixed face-up and face-down, performer rightens them behind back except for selection
Inspired by 1980 Color Quik 29
Bob Hummer Hummer's 18 Card Mystery 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
Related toVariationsAlso published here 1980 Bob Hummer's Collected Secrets 7
Bob Hummer Hummer's Swindle 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
Also published here 1980 Bob Hummer's Collected Secrets 7
Bob Hummer The Lonely Card CATO routine, cards turned face up, performer takes packet behind back and reverses all cards except selection
Related toVariationsAlso published here 1980 Bob Hummer's Collected Secrets 7
Bob Hummer The Little Moonies 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
Also published here 1980 Bob Hummer's Collected Secrets 8
Bob Hummer Personality Test face-up/face-down prediction of number of cards, weird, CATO related, personality type presentation
Related toVariationsAlso published here 1980 Bob Hummer's Collected Secrets 14
Karl Fulves Power Play instruction game ten card poker deal
1980 Bob Hummer's Collected Secrets 63
Charles Hudson Sum Hummer Ace to Ten packet, mixed face up and down by spectator, number of reversed cards and their total predicted, CATO principle
Variations 1982 Best of Friends 105
Charles Hudson The Royal Computer Kings and Queens are given to spectator for CATO procedure, two card turned over, two previous selections
Variations 1982 Best of Friends 109
Karl Fulves The Dating Game No. 3, spectator turns cards over, at the end only a King-Queen pair is face-up
Inspired by 1984 More Self-Working Card Tricks 4
Karl Fulves Odd Color Out No. 19, cards shuffled face-up/face-down via CATO by spectator, two selections made, performer handles cards and all face-up cards are red with a black selection and vice versa
Variations 1984 More Self-Working Card Tricks 27
Aldo Colombini Clubbed in one half selection turns over, in other half all cards from the same suit are found reversed
1985 The Trapdoor — Volume One (Issue 11) 187
Martin Gardner Paradox Papers 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 odd-colored at the end)
Also published here 1985 Self-Working Paper Magic 18
Philip T. Goldstein, Robert E. Neale Toddler packet mixed face-up/face-down, values added up is force number
Inspired by
  • "Baby Hummer" (Charles Hudson, Linking Ring)
Variations
1989 Fifth 3
Karl Fulves Parity Prophet 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
1993 Rigmarole (Issue 4) 45
Peter Duffie Principles and Deceptions "An Easy Trip Through The Arithmetical Principles Of Card Magic - Part 4"
  • Two Unique Principles of Bob Hummer
  • Principle One
  • Principle Two (CATO)
1993 Profile (Issue 16) 6
Peter Duffie Card Prediction face-up cards after CATO mixing added, card at that position in rest of deck predicted
1993 Profile (Issue 17) 5
Unknown Basic Hummer four cards, selection is only one reversed after some procedure
Inspired by
  • "Baby Hummer" (Charles Hudson, Linking Ring)
Also published here
1993 Card File 72
Persi Diaconis Beyond Hummer four cards, selection is only one reversed after some procedure
Also published here 1993 Card File 74
Karl Fulves Day One date chosen by choosing some face-up and face-down cards from grid layout, looked up in diary, card noted there predicted, tapestry
Variations 1994 Crooked Tales 35
Karl Fulves Triumph With Math tapestry layout and foldover
1994 Crooked Tales 39
Karl Fulves Foldover Notes
Related to 1994 Crooked Tales 40
Simon Aronson Moves and Removes marker moved on 3x3 layout, final card predicted, with 4x4 "Sixteen Card Version" on p. 30
Related to
  • Martin Gardner Presents (1993), p. 149
1995 Simply Simon 19
Peter Duffie Pasteboard Detection mathematical, CATO
May 1996 Apocalypse Vol. 16-20 (Vol. 19 No. 5) 2645
Peter Duffie Still Scheming Play it Straight Triumph type of effect with CATO procedure, use half a deck
Inspired by 1997 Effortless Card Magic 144
Philip T. Goldstein Paradox Redux "Dot Com - Tricks and stunts with numbers"
tapestry parity principle, credit information, 4x4 number matrix, 19 or 61
Inspired by 1998 The Fine Print (Issue 8) 247
Karl Fulves Cut-Rate Hummer "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
Variations 1998 The Fine Print (Issue 9) 285
Peter Duffie Intuitive cards with colored spots and numbers, some selected, a prediction is matched
Related to 1998 Five Times Five — Scotland 54
David Regal Letter Perfect Spectator mixes stack of alphabet cards face up/down, the face down cards spell his/her name
1999 Close-Up & Personal 88
Karl Fulves 37 Threes "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
Related to 1999 The Fine Print (Issue 10) 348
Unknown Basic Hummer Baby Hummer, four cards flipped face up and down, end with selection being the only one reversed.
Related toAlso published here 1999 Cunning Card Miracles 37
Persi Diaconis Beyond Hummer Variation on Basic Hummer
Also published here 1999 Cunning Card Miracles 39
Tom Craven Hummer - Odd Back Basic Hummer, but selected card is reversed and also odd-backed
Also published here 1999 Cunning Card Miracles 41
Tom Craven Hummer Clean-up Clean-up for Baby Hummer (1 2 3 4 turnover)
Also published here 1999 Cunning Card Miracles 44
Doug Canning Canning's Baby Hummer Baby Hummer using six cards
Also published here 1999 Cunning Card Miracles 45
Karl Fulves Hofzinser + Math Aces shuffled reversed into packet, another card chosen, face-up/face-down mix, all cards right except a chosen Ace but selection instead
Inspired byRelated to 2000 Latter Day Secrets (Issue 3) 55
Karl Fulves Symmetry comment on the Fujiwara effect, two card location
Inspired by
  • "Automatic Ace Triumph" (Kuniyasu Fujiwara, Genii, May 2000)
2000 Latter Day Secrets (Issue 3) 56
Karl Fulves Place The Aces twenty-card packet mixed face-up/face-down, all cards right except Aces
2000 Latter Day Secrets (Issue 3) 56
Tom Craven Hummer Clean-Up four cards, selection is only one reversed after some procedure
Inspired by
  • "Baby Hummer" (Charles Hudson, Linking Ring)
Also published here
2000 Card File Two 69
Tom Craven Hummer - Odd Back selection also has odd back
Inspired by
  • "Baby Hummer" (Charles Hudson, Linking Ring)
Also published here
2000 Card File Two 70
Doug Canning Canning's Baby Hummer with six cards
Inspired by
  • "Baby Hummer" (Charles Hudson, Linking Ring)
Also published here
2000 Card File Two 72
Karl Fulves Tomorrow's Card No. 47, eight cards shuffled face-up/face-down, number of reversed cards and their identity predicted
Inspired by
  • "Baby Hummer" (Charles Hudson, Linking Ring)
2001 New Self-Working Card Tricks 67
Karl Fulves, Bob Hummer Psychic Map 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 face-up cards are red and vice versa
2001 New Self-Working Card Tricks 104
Harry Lorayne Darn! I Couldn't... four Tens on table, three cards on each, CATO ("leave or reverse"), Aces are only cards reversed cards in the end
Related to
  • "Automatic Ace Triumph" (Kuniyasu Fujiwara, Genii, May 2000)
Variations
2001 Personal Collection 485
Harry Lorayne A Couple of Pages sixteen cards mixed face up and down by spectator, number of reversed cards and their total predicted
Inspired by 2001 Personal Collection 489
Harry Lorayne Symbiotic sixteen cards shuffled face-up/face-down, Aces are only cards reversed at the end, faro
2001 Personal Collection 493
Harry Lorayne Spur of the Moment two selections are only reversed cards in packet after CATO procedure
Inspired by 2001 Personal Collection 495
Harry Lorayne Another Moment CATO procedure with twelve-card packet, reversed cards at end are known, or total predicted, or...
2001 Personal Collection 499
Reinhard Müller Surprise Ace Triumph Aces shuffled reversed into packet, face-up/face-down mix, all cards right except the Queens
Inspired by
  • "Automatic Ace Triumph" (Kuniyasu Fujiwara, Genii, May 2000)
Related to
2001 Latter Day Secrets (Issue 5) 139
Peter Duffie Triple Humdinger face-up/face-down prediction of number of cards in packet, three predictions
Inspired byRelated to 2001 Cards By All Means 16
Jim Steinmeyer Automatic Poker ten cards are "mixed" by spectator, then red-black separated or poker deal, Pseudo-CATO
Related to 2002 Impuzzibilities 23
Karl Fulves The Rule For Red different handling than CATO, switching two cards
Inspired by 2002 Latter Day Secrets (Issue 7) 262
Peter Duffie, Robin Robertson Hummer Principle (CATO) explanation and credit information
2003 Card Conspiracy — Vol. 1 108
Peter Duffie, Robin Robertson Thought Process selection ends up reversed in packet
Variations 2003 Card Conspiracy — Vol. 1 109
Roy Walton CATO By Numbers simplified
Inspired byVariations 2003 Card Conspiracy — Vol. 1 110
Peter Duffie, Robin Robertson CATO Gets Married Kings and Queens, in the end a matching pair ends up reversed
Inspired byVariations 2003 Card Conspiracy — Vol. 1 111
Peter Duffie, Robin Robertson Cato Gets Married - Again
Inspired by 2003 Card Conspiracy — Vol. 1 112
Peter Duffie, Robin Robertson Hummer Plays Poker packet mixed via CATO, Royal Flush shows up at the end
Related toVariations 2003 Card Conspiracy — Vol. 1 113
Peter Duffie, Robin Robertson Remote Control Poker Royal Flush shows up at the end
Inspired byRelated to 2003 Card Conspiracy — Vol. 1 114
John Bannon Degrees Of Freedom CATO, Koenig's Tapestry, combo to produce royal flush
Variations 2004 Dear Mr. Fantasy 128
John Bannon Origami Poker CATO, Koenig's Tapestry, combo to produce royal flush
2004 Dear Mr. Fantasy 144
John Bannon Perfect Strangers CATO, Koenig's Tapestry, prediction combo with rainbow packet
Variations 2004 Dear Mr. Fantasy 155
William Goodwin Postcards Prediction CATO, Koenig's Tapestry, prediction combo with postcards instead of playing cards
2004 Dear Mr. Fantasy 158
John Bannon The Works explanation of CATO principle and the Koenig's Tapestry fold (Dudeney Folding)
  • First Principles
  • Isolating Target Cards
  • Rlues Of Engagement
  • The Folding Phase
Related to 2004 Dear Mr. Fantasy 159
Reinhard Müller Three-Deal Royal Flush different method for Flip-Flop Poker
2004 Semi-Automatic Card Tricks — Volume 5 77
Peter Duffie, Robin Robertson Chapter 11 - Pseudo-CATO intro, CATO with turning three instead of two cards over, "CATO preserves the face-up/face-down orientation while mixingthe positions. In contrast, Pseudo-CATO preserves the relative odd/even alternating positions while mixing their face-up/face-down orientation."
Related to 2004 Diamonds from Coal 92
Peter Duffie, Robin Robertson Guessing Colors selection ends up in odd-colored pile, pseudo-CATO
2004 Diamonds from Coal 92
Peter Duffie, Robin Robertson Moving Colors packet, two selections (one red, one black) end up in odd-colored pile, pseudo-CATO
2004 Diamonds from Coal 93
Peter Duffie, Robin Robertson Uncertain Separation after some mixing the cards are eventually sorted either red/black or picture/spots, pseudo-CATO
Variations 2004 Diamonds from Coal 95
Peter Duffie, Robin Robertson Indeterminate Conclusion same with two selections ending up in opposite group, pseudo-CATO
Inspired by 2004 Diamonds from Coal 97
Peter Duffie, Robin Robertson TAPGAC "Turn any Pairs, Gather and Cut", alternative way of doing Hummer's CATO
  • The TAPGAC Fix
  • End Notes
2004 Diamonds from Coal 120
Peter Duffie, Robin Robertson Chao Theory red-black separation with letter cards, using TAPGAC
2004 Diamonds from Coal 122
Peter Duffie, Robin Robertson The Royal Clans red-black separation with procedure and picture cards, using TAPGAC
2004 Diamonds from Coal 123
Peter Duffie, Robin Robertson Return of the Lonely Card all reversed except selection after mixing process, using TAPGAC
Inspired by 2004 Diamonds from Coal 124
Peter Duffie, Robin Robertson Princes and Peasants red-black separation with procedure, using TAPGAC
2004 Diamonds from Coal 126
Peter Duffie, Robin Robertson Deduction Production selection and rest of four-of-a-kind eventually found, using TAPGAC
2004 Diamonds from Coal 127
Peter Duffie, Robin Robertson Two for the Road after packet mixing process only five cards are face-up - 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
Inspired by
  • "Automatic Ace Triumph" (Kunyasu Fujiwara, Genii, May 2000)
Related to
2004 Diamonds from Coal 129
Karl Fulves Pseudo Hummer fooling magicians who know the Hummer CATO trick
2005 Combo II 46
Tom Craven Raising Baby Hummer selection is reversed, variation with odd-colored back
  • Off-Color Baby Hummer
Inspired by
  • Charles Hudson's "Baby Hummer" in "The Linking Ring" December, 1967.
2006 Semi-Automatic Card Tricks — Volume 6 72
Michael Powers Total Freedom five selections found after CATO and mixing procedure
2006 Power Plays 128
Richard Vollmer Sum Hummer Explored packet mixed face up and down by spectator, number of reversed cards and their total predicted, CATO principle
Inspired byVariations 2007 Best of Friends — Volume III 264
David Solomon Outdoing "Hummer Outdone" twenty cards shuffled face-up/face-down with CATO under table by spectator, one remembered, performer rights all except selection under the table, ten double facers
2007 The Wisdom of Solomon 167
Persi Diaconis, Ron Graham Mathematics in the Air Chapter intro that describes the CATO Principle and the mathematics behind it, along with tricks
Related to 2012 Magical Mathematics 1
Charles Hudson Baby Hummer Used to demonstrate the CATO principle, uses four cards
Related toVariations 2012 Magical Mathematics 1
Bob Hummer Hummer's Ten Card Mystery 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
Related toAlso published here
  • "18 Card Mystery" (Bob Hummer, Face-up / Face-down Mysteries, 1942)
2012 Magical Mathematics 4
Steve Freeman Royal Hummer Cards are mixed face up and face down haphazardly, later all cards are face down except a royal flush
Variations 2012 Magical Mathematics 8
Persi Diaconis, Ron Graham Back to Magic End of chapter, describes Steve's own variation on Steve Freeman's handling of Royal Hummer
Inspired by 2012 Magical Mathematics 15
Ramón Riobóo Disparity 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.
Related to 2015 Semi-Automatic Card Tricks — Volume 10 88
Lewis Jones MatsuNOma Principle Procedure which allows you to perform the petal force by Mitsunobu Matsuyama without a down-under deal.
Related to 2015 Semi-Automatic Card Tricks — Volume 9 81
Harry Lorayne The Top-Level Test twenty cards mixed face-up and face-down including a Royal Flush, Royal Flush is only face-up cards
Inspired by
  • "Really!" (Harry Lorayne, Lecture Notes)
Related to
2015 JawDroppers! 191
Harry Lorayne Incredible Flush Control diamond Royal Flush mixed in twenty-card packet, CATO procedure, at the end the Royal Flush in Spades is reversed
Inspired by 2015 JawDroppers! 195
Harry Lorayne Try This! mixing procedure for CATO
2015 JawDroppers! 198
Harry Lorayne, Richard Vollmer Sum Hummer Explored packet mixed face up and down by spectator, number of reversed cards and their total predicted, CATO principle
Inspired by 2017 JawDroppers! Two 170
Harry Lorayne Three New TOACS TOAC = Turn Over And Cut, all with twelve-card packet
  • Prediction
  • One To Twelve (named value of a suit only reversed at end)
  • Incredible 2-Card Location
2017 JawDroppers! Two 173
Harry Lorayne "That's Impossible!" only four Aces reversed after CATO procedure with sixteen cards
Inspired by
  • "Really!" (Harry Lorayne, Lecture Notes)
2017 JawDroppers! Two 176
Harry Lorayne Eight/Great - Nine/Fine
  • one of eight-card packet remembered (force), found with CATO
  • one of nine-card packet remembered, found with reverse faros
2017 JawDroppers! Two 228
David Solomon Folded Discovery 4x4 matrix layout, folding tapestry, all of one color end up reversed except selection
Inspired by 2018 Solomon's Secrets 31
Harry Lorayne Really! four-of-a-kind ends up reversed after CATO/TOAC procedure
Also published here
  • "Really!" (Harry Lorayne, Lecture Notes)
2018 And Finally! 75
Reinhard Müller Baby Boom with four cards
Inspired by 2020 Semi-Automatic Card Tricks — Volume 12 179
Lorenz Schär Personality Quest face-up/face-down prediction of number of cards, minor variation of Hummer's Personality Test
Inspired by 2020 Semi-Automatic Card Tricks — Volume 12 180
Steve Beam Strike Out face-up/face-down prediction of number of cards
Inspired byRelated to 2020 Semi-Automatic Card Tricks — Volume 12 181
Steve Beam Personalized Personality Test face-up/face-down prediction of number of cards
Inspired by 2020 Semi-Automatic Card Tricks — Volume 12 183
Steve Beam The Randomized Lie Detector face-up/face-down cards to form a number and to find selection
Inspired by 2020 Semi-Automatic Card Tricks — Volume 12 184