In no-limit or pot-limit poker,
 a player's M-ratio (also called "M number", "M factor"[1] or just "M") is a measure 🗝  of
 the health of a player's chip stack as a function of the cost to play each round. In
 simple 🗝  terms, a player can sit passively in the game, making only compulsory bets, for
 M laps of the dealer button 🗝  before running out of chips. A high M means the player can
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