Carromboard Puzzle

نویسنده

  • Yuval Filmus
چکیده

There is a table with four coins in the positions north, east, south and west, and the player’s goal is to get them all in the same orientation, i.e. all heads or all tails. The player never sees the coins but will be informed as soon as he has reached his goal. A move consists of the player mentioning one or more positions in which the coins will then be turned over; the complication is that, prior to each move, the table is rotated by a multiple of 90◦; the multiple remains unknown to the player and may vary from move to move.

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تاریخ انتشار 2009