

glowball Regular user Nashville TN 200 Posts 
Deck of 124 blank cards numbered one through 124. Spectator randomly picks any five cards. The magician picks one of those five cards as Target and has spectator put it in their pocket. Then the magician arranges other four cards in a sequence that his assistant can decipher to determine the Target card.
ENCODING (magician) calculation synopsis: mod five on all five cards to determine 15 value (if zero make it 5) position of the Target card. Then Target (1 thru 124) value plus constant 5 then minus the 15 value then divide by constant 5 (round down) to get the 124 value to rearrange the four remaining cards. DECODING (assistant) calculation synopsis: Mod five on the four cards giving 15 value. Look at four cards sequence and determine the 124 value then multiply that by constant 5 then add 1 then subtract the 15 value. Adjust up by 1 for each of 4 cards passed or hit. This arrives at the Target card number. Details about the 124 number used by both the encoding and decoding calculations: Note that there are 24 combinations that the four cards can be arranged in and if say 16 is the combination number this means to use the 16th combination. Here is how we figure that combination: A. there are four groups of six combinations B. those four groups are 16, 712, 1318, 1924 C. the 16 falls in the 1318 group which is the third group this means that the first of the four signal cards must be the third highest. Now for the other three cards they use the standard Fitch Cheney signaling sequence of 16 using the low medium high technique to pinpoint which one of the six by: LMH=1 LHM=2 MLH=3 MHL=4 HLM=5 HML=6 so in our example 16 is the 4th number within the 1318 range therefore the remaining three cards must signal the number 4 therefore the 3 numbers must be in medium high, low, order in our example of 16. Note that the 124 number is NOT the target number but is used to help calculate the target number. Note that instead of blank cards numbered one through 124 you could use three regular decks and write in big numbers on their backs: redback cards 152 blue Back cards 53104 green back cards (only 20) 105124 or instead of carrying a fat deck you could have a random spectator call out five numbers in that range (1124) and you the magician write those numbers on a large pad (so all can see) and work from there. Note that mathematicians have referred to or described the 124 trick but in terms that are difficult for nonmathematicians to understand therefore I Larry Finley and brother David Finley have tried to state this in a way that an average magician can understand and do this trick. I have also written a spreadsheet that can serve as the assistant on a cell phone thereby allowing the magician to do this 124 trick anytime without having a human assistant. According to my research mathematicians who have written about this 124 version: Elwyn Berlekamp (deseased) Stein Kulseth Gadiel Seroussi Michael Kleber and wife Jessica Polito Bill Cheney Norman Do Ravi Vakil Colm Mulcahy Tsai Simonson Tara Holm Art Benjamin Persi Diaconis Note according to my research Michael and Jessica are the first I can find to actually perform the 124 version before live audiences in 20012002. I know there is another large thread about the Fitch Cheney etc tricks but I wanted to share a very specific solution to the 124 variant here. 
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