N. Ethier, S. et A. Levin, David, On the fundamental theorem of card counting, with application to the game of trente et quarante, Advances in applied probability , 37(1), 2005, pp. 90-107
A simplified proof of Thorp and Walden's fundamental theorem of card counting is presented, and a corresponding central limit theorem is established. Results are applied to the casino game of trente et quarante, which was studied by Poison and De Morgan.