De Courcy, Ken: The Australian Gambling Game of 31 ©1978 (circa) Supreme Magic Co., Devon, England Softcover, saddle-stitched, 9x10"

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Comments (qr): The magician always wins in this game of "chance"

Contents:

1 Effect: The Ace to Six of each suit are placed on the table, and the Two players turn cards face down alternately and a running total of the pips is maintained. The winner is the one who takes the total to no more than 31. Even after the spectator is told the secret to winning, the magician still wins! Ends with an extra kicker.