The now-famous card trick known as ``Kruskal's Principle'', or the ``Kruskal Count'' among professional card magicians, originated with the physicist Kruskal, of Princeton University [see 2, p. 274]. The trick runs as follows. The dealer asks the player to silently pick a number from 1 to 10, call it . This number becomes the player's first ``secret'' card. From this point onward, there is no more communication between the dealer and the player. The dealer now begins dealing cards, face up, and when the 'th card comes up, its face value, say , determines that the next ``secret'' card is cards further into the deck. The player keeps track of his new secret cards , etc. The dealer continues to deal cards, and at some point stops to announce that she has magically reached one of the player's secret cards.
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