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