Guessing about Guessing: Practical Strategies for Card Guessing with Feedback

In simple card games, cards are dealt one at a time and the player guesses each sequentially. We study problems where feedback (e.g., correct/incorrect) is given after guess. For decks with repeated values (as in blackjack suits do not matter), optimal strategy differs from “greedy strategy” (of guessing most likely round). Further, both greedy strategies far too complicated for real-time use by human players. Our main results show that heuristics perform close to optimal.