Shanten: Difference between revisions

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*If a hand has >= 6 blocks: +1 shanten  
*If a hand has >= 6 blocks: +1 shanten  
*If a hand does not have a pair: +1 shanten  
*If a hand does not have a pair: +1 shanten  
** If a hand has 4 groups + 0 pairs: Set to tenpai
** If a hand has 4 groups + 0 paira: Set to tenpai


For "blocks" = (taatsu/pairs/groups). This is identical to the above calculation, but assumes all hands have a pair, then adds +1 shanten if it doesn't actually have a pair. This generalization works in all cases except when a hand in tenpai is waiting on a pair, which is why the "4 groups + 0 pair = tenpai" exception is present.
For "blocks" = (taatsu/pairs/groups). This is identical to the above calculation, but assumes all hands have a pair, then adds +1 shanten if it doesn't actually have a pair. This generalization works in most cases; notable exceptions include hands with 3 groups + 1 taatsu + 2 isolated tiles (which is 1-shanten), or 4 groups + 1 lone tile (which is tenpai).


=== Chiitoitsu ===
=== Chiitoitsu ===
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