Tile efficiency: Difference between revisions

Tile efficiency (view source)

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 A hand's [[shanten]] measures how far a hand is from [[tenpai]]. A hand that is 1-shanten is 1-away from tenpai, a hand in 2-shanten is 2-away from tenpai, and so on.
-[[Ukeire]], or tile acceptance, measures how many tiles can be used to reduce a hand's shanten. A hand may have a tile acceptance of 40 tiles, meaning that there are 40 different tiles ''that can be drawn'' to advance the hand. The hand may have 10, 14, 16 distinct ''types'' of tiles that improve the hand, but "tile acceptance of 40" means there are 40 tiles that can physically be drawn.
+[[Ukeire]], or tile acceptance, measures how many tiles can be used to reduce a hand's shanten. For example:
+{{mjt: 123456m23p78p99s1z}} Accepts: {{mjt:14p69p}} to enter tenpai
+Assuming no tiles have been discarded, this hand's tile acceptance is 16 tiles (4 types * 4 copies/type = 16). If two 1-pin have been discarded, the effective tile acceptance is reduced to 14 tiles.
 Note: when measuring tile acceptance in actual games, it is important to note the amount of tiles actually available. Any tile discarded, used in your hand, used in an opponents call, or in the dora indicators can no longer be drawn, which affects the hand's tile acceptance. For example, a 67-pin ryanmen joint normally has an acceptance of 8 (four 5-pins; four 8-pins). If all four 5-pin and three of the 8-pin are discarded, the wait effectively has an acceptance of 1 tile.