Riichi: Difference between revisions

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→‎Kan during riichi

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 A player may actually declare riichi with a [[Tenpai|noten hand]].  This is a '''noten riichi''' {{kana|ノテン立直}}, which is highly not advisable.  Of course, computer based play is usually programmed to prevent players from making such a riichi declaration.  If and when the hand results in [[ryuukyoku]], then it is required of the player to reveal the hand to show tenpai.  The noten riichi would naturally show noten; and it is subject to [[chombo]].  Likewise, chombo is applied if a win is called, as the hand's winning status would be verified only to reveal an invalid hand.  Players may escape this dubious position, when another player wins the hand or has committed a chombo penalty.  An [[abortive draw]] may also prevent the chombo penalty, except suucha riichi.
-=== Kan during riichi ===
+=== Kan ===
-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|sequence]] or part of the pair.
+{{main|Kan#Kan during riichi}}
-If a player does declare a kan illegally during riichi, and they call [[ron]] or the game goes to an [[ryuukyoku|exhaustive draw]], then they will be penalized with a [[chombo]] penalty for breaking the rule. If a player is not required to reveal their hand, or if another player wins, they will normally not be penalized.
+Kan during riichi is a discretionary play.  Players must take not of the hand composition to determine, whether the kan is allowable or not.  Disallowable calls either alters the hand's waiting pattern or alters the hand's composition, where tile groupings are changed.  Improper calls are subject to chombo.
-'''Example 1:'''
-:{{#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.
-'''Example 2:'''
-:{{#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.
-'''Example 3:'''
-:{{#mjt:3335666p111456s}} Illegal kan: {{#mjt:36p}}
-Here, the waits are 457p. A kan on 6p would remove the 7p wait, so it is obviously not permitted. A kan on the 3p would not change the waits, however, if the hand was won with 4p, the hand could be interpreted as:
-:{{#mjt:33p}} {{#mjt:345p}} {{#mjt:666p}} {{#mjt:111s}} {{#mjt:456s}}
-In this case, the 3p does not form a [[koutsu|triplet]], but rather a pair and a part of a sequence. A kan on the 3p would remove this potential interpretation of the hand, and is therefore forbidden.
 === Furiten ===