New top story on Hacker News: The Kruskal Count Card Trick 3 https://ift.tt/2I9ytdL
The cards below were ordered by shuffling a deck of cards and then dealing them out. Click on any card in the first row. Whatever number is on this card move this many cards to the right and click the new card, treating Ace as a 1 and face cards as 5, and wrapping around to the left side of the next row. Repeat from the card just clicked. I magically know that you will (usually) end up on the 'trap' card, indicated by a thick border. The two deck version is successful over 95% of the time. To reshuffle and play again hit the reload button on your browser.
The victim shuffles a deck thoroughly, then secretly picks a number between 1 and 10. The cards are dealt out slowly and steadily, face up, the victim's first key card being the one at the position they choose in advance. The value of this card determines how many to deal out to the next key card, e.g., if the key card is a 4 victim counts off four cards, the last being the new key card. Royal cards count 5. The process is repeated as often as is possible. Eventually they will get a key card (perhaps the last card in the deck) which is not followed by enough cards to get to another one; this last key card is the one they remember. No matter how steadily the victim deals, with no pauses to give any hints as to which cards are key cards, you successfully identify their last key card. For many people, this trick grows more mysterious with repetition.
Kruskal's counting procedure goes as follows. The subject shuffles a deck of cards as many times as he likes. He mentally chooses a (secret) number between one and ten. The subject turns the cards of the deck face up one at a time, slowly, and places them in a pile. As he turns up each card he decreases his secret number by one and he continues to count this way till he reaches zero. The card just turned up at the point when the count reaches zero is called the first key card and its value is called the first key number. Here the value of an Ace is one, face cards are assigned the value five, and all other cards take their numerical value. The subject now starts the count over, using the first key number to determine where to stop the count at the second key card. He continues in this fashion, obtaining successive key cards until the deck is exhausted. The last key card encountered, which we call the tapped card, is the card to be “guessed” by the magician.
The cards below were ordered by shuffling a deck of cards and then dealing them out. Click on any card in the first row. Whatever number is on this card move this many cards to the right and click the new card, treating Ace as a 1 and face cards as 5, and wrapping around to the left side of the next row. Repeat from the card just clicked. I magically know that you will (usually) end up on the 'trap' card, indicated by a thick border. The two deck version is successful over 95% of the time. To reshuffle and play again hit the reload button on your browser.
The victim shuffles a deck thoroughly, then secretly picks a number between 1 and 10. The cards are dealt out slowly and steadily, face up, the victim's first key card being the one at the position they choose in advance. The value of this card determines how many to deal out to the next key card, e.g., if the key card is a 4 victim counts off four cards, the last being the new key card. Royal cards count 5. The process is repeated as often as is possible. Eventually they will get a key card (perhaps the last card in the deck) which is not followed by enough cards to get to another one; this last key card is the one they remember. No matter how steadily the victim deals, with no pauses to give any hints as to which cards are key cards, you successfully identify their last key card. For many people, this trick grows more mysterious with repetition.
Kruskal's counting procedure goes as follows. The subject shuffles a deck of cards as many times as he likes. He mentally chooses a (secret) number between one and ten. The subject turns the cards of the deck face up one at a time, slowly, and places them in a pile. As he turns up each card he decreases his secret number by one and he continues to count this way till he reaches zero. The card just turned up at the point when the count reaches zero is called the first key card and its value is called the first key number. Here the value of an Ace is one, face cards are assigned the value five, and all other cards take their numerical value. The subject now starts the count over, using the first key number to determine where to stop the count at the second key card. He continues in this fashion, obtaining successive key cards until the deck is exhausted. The last key card encountered, which we call the tapped card, is the card to be “guessed” by the magician.
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