Around the Clock. New Twists on Fitch Cheney's Five-Card Trick
Abstract
Fitch Cheney's five-card trick is one of the purest two-person effects in card magic, and it has attracted mathematicians for more than seventy five years. This article retells the effect and its classic method, surveys how far it can be pushed, and presents several new results that matter to performers. We give a version of Cheney's method that needs no fixed first suit and no fixed ``lowest card'': shifting every card one step in rank and one step in suit shifts the display in the same way. A heckler who may swap two neighboring cards of the display defeats every method with a full deck. We show that a 29-card deck is the largest for which such a swap can be corrected, and that the corresponding maximum is 14 cards if any two cards may be swapped. We give simple methods that achieve both bounds. Finally, we make Berlekamp's arithmetic method for the 124-card deck independent of where the numbering starts. We also describe a pocket version with eight cards.
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BibTeX
@misc{levy2026around,
title = {{Around the Clock. New Twists on Fitch Cheney's Five-Card Trick}},
author = {Doron Levy and Yaakov Malinovsky},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.02424},
eprint = {2611.02424},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.02424},
}
RIS
TY - UNPB
TI - Around the Clock. New Twists on Fitch Cheney's Five-Card Trick
AU - Doron Levy
AU - Yaakov Malinovsky
PY - 2026
DA - 2026/11/02
PB - arXiv
DO - 10.48550/arxiv.2611.02424
UR - https://arxiv.org/abs/2611.02424
AB - Fitch Cheney's five-card trick is one of the purest two-person effects in card magic, and it has attracted mathematicians for more than seventy five years. This article retells the effect and its classic method, surveys how far it can be pushed, and presents several new results that matter to performers. We give a version of Cheney's method that needs no fixed first suit and no fixed ``lowest card'': shifting every card one step in rank and one step in suit shifts the display in the same way. A heckler who may swap two neighboring cards of the display defeats every method with a full deck. We show that a 29-card deck is the largest for which such a swap can be corrected, and that the corresponding maximum is 14 cards if any two cards may be swapped. We give simple methods that achieve both bounds. Finally, we make Berlekamp's arithmetic method for the 124-card deck independent of where the numbering starts. We also describe a pocket version with eight cards.
ER -