M-ratio
Measure of the health of a player's chip stack in poker / From Wikipedia, the free encyclopedia
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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 afford to wait a high number of rounds before making a move. The concept applies primarily in tournament poker; in a cash game, a player can in principle manipulate his M at will, simply by purchasing more chips.
A player with a low M must act soon or be weakened by the inability to force other players to fold with aggressive raises.
The term was named after Paul Magriel.