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Riichi: Difference between revisions
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When a riichi declarer holds three identical tiles and draws the fourth after the riichi announcement, he may form an [[Kan|ankan]] from these tiles instead of discarding the fourth. The hand composition and the possible winning tiles may not change: It is not allowed to declare kan if, for some possible winning tile, any of the three identical tiles may be interpreted as part of a shuntsu or part of the pair. | When a riichi declarer holds three identical tiles and draws the fourth after the riichi announcement, he may form an [[Kan|ankan]] from these tiles instead of discarding the fourth. The hand composition and the possible winning tiles may not change: It is not allowed to declare kan if, for some possible winning tile, any of the three identical tiles may be interpreted as part of a shuntsu or part of the pair. | ||
Example 1: | |||
:{{#mjt: | :{{#mjt:3444m778899s333z}} Illegal kan: {{#mjt:4m}} Legal kan: {{#mjt:3z}}. | ||
It is not allowed to kan the fours. The manzu tiles may either be interpreted as a 3-4 [[Ryanmen|ryanmen]] wait and a 4-4 pair, or as a 4-man ankou with a 3-man [[tanki]] wait. A kan call would alter the wait just for a 3-man tanki. For a legal kan declaration, the three identical tiles would have to be an ankou in any interpretation. Had the player drawn a west wind, he would have been allowed to kan it. | It is not allowed to kan the fours. The manzu tiles may either be interpreted as a 3-4 [[Ryanmen|ryanmen]] wait and a 4-4 pair, or as a 4-man ankou with a 3-man [[tanki]] wait. A kan call would alter the wait just for a 3-man tanki. For a legal kan declaration, the three identical tiles would have to be an ankou in any interpretation. Had the player drawn a west wind, he would have been allowed to kan it. | ||
Example 2: | |||
:{{#mjt:111m222333p5678s}} | :{{#mjt:111m222333p5678s}} Legal kan: {{#mjt:1m}} {{#mjt:2p}} or {{#mjt:3p}}. | ||
In this example, none of the waits are affected by any of the kan possibilities. The waiting tiles are completely unrelated to any of the existing triplets in this hand. Therefore, it is acceptable to call kan during riichi here. | |||
=== Furiten === | === Furiten === | ||