Riichi Book 1: Difference between revisions

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* At two pairs, either pair can be turned into a triplet safely. This leads to an acceptance of 4 tiles.
* At two pairs, either pair can be turned into a triplet safely. This leads to an acceptance of 4 tiles.
* At three pairs, any pair can be turned into a triplet, but it was already safe to turn pairs into triplets at two pairs. This leads to an acceptance of 6 tiles.
* At three pairs, any pair can be turned into a triplet, but it was already safe to turn pairs into triplets at two pairs. This leads to an acceptance of 6 tiles.
Going from 1 -> 2 adds four tiles of acceptance, while 2 -> 3 only adds two tiles. If the third pair can be [[pon]]'d easily, such as a [[yakuhai]] pair in the early game, then having three pairs is fine.
Pairs can be combined with joints to form complex joints (e.g. 45 is a ryanmen, 445 is a ryanmen+pair. The latter counts as a pair and a joint).


===Perfect shanten===
===Perfect shanten===
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