Sekinin barai: Difference between revisions

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→‎Sekinin barai for yakuman: Extracted a section of liablility judgement

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 : {{#mjt:8s}}, last: {{#mjt:777'z}}, formers: {{#mjt:55'5z}} {{#mjt:1'23p}} {{#mjt:6'66z}}
 : Shimocha feeds the last set of dragon-tile triplet, he becomes the liable player.
-<!--
-: {{#mjt:1234m}}, last: {{#mjt:666'6z}}, formers: {{#mjt:5'55z}} {{#mjt:77'7z}}
-: Although the hand is already daisangen even without daiminkan of hatsu, toimen still becomes the liable player.
-: {{#mjt:99m57s}}, last: {{#mjt:0550z}}, formers: {{#mjt:666'z}} {{#mjt:77'7z}}
-: Last dragon-tile triplet is an ankan. Nobody is liable to this hand.
--->
 ==== Daisuushi ====
 If a player has called three mentsu of [[kazehai|wind tiles]] calls for a koutsu/kantsu of the fourth wind type, upgrading their hand to an apparent daisuushii,  the player who dealt into the fourth wind call is deemed liable for full payment if the calling player later wins the hand.
 : {{#mjt:5p}}, last: {{#mjt:22'2z}}, formers: {{#mjt:1'11z}} {{#mjt:4'44z}} {{#mjt:333"z}}
-: Toimen becomes liable with confirming the fourth wind-tile triplet.
+: Toimen becomes liable player with confirming the fourth wind-tile triplet.
+=== Judgement of liability ===
+A misunderstanding happens frequently when the last required set was melded with a daiminkan, since this seems to suggest that such liability should no longer be applied, due to the fact that the yakuman already exists even without daiminkan. To understand how liability works with "the responsibility of completing an ensured yakuman", it is better to switch to opponent's view: if a yakuman is ensured in opponent's view, the relationship of liability will be established.
+'''Example''':
+Supposing a player completed a daisangen, and the hand looks like the following one in his view:
+: {{#mjt:1234m}}, last: {{#mjt:666'6z}}, second: {{#mjt:5'55z}}, first: {{#mjt:77'7z}} (Main perspective)
+Toimen becomes the liable player as the fact that he becomes the feeder of last sangenpai set. But one may try to point out that a yakuman is already completed before this daiminkan happens, which looks like in main perspective's view:
+: {{#mjt:1234m666z}}, second: {{#mjt:5'55z}}, first: {{#mjt:77'7z}} (Main perspective)
+Though such proposing is incorrect. The point is, any of other opponents can never know the actual combination of main perspective's hand. In opponent's view, it actually look like:
+: {{#mjt:0000000z}}, second: {{#mjt:5'55z}}, first: {{#mjt:77'7z}} (Opponent's view)
+It is apparently not an "ensured" yakuman (although it may probably be):
+:1. The hand doesn't suggest he "must" have a concealed triplet of hatsu: (This also suggests why kamicha, the feeder of second require set "haku", doesn't need to be liable for the yakuman hand.)
+:: {{#mjt:1234m111z}} {{#mjt:5'55z}} {{#mjt:77'7z}}
+:2. The hand may finally go like this afterwards since the player can discard hatsu and switch his ready tiles (even though this highly seems to not happen):
+:: {{#mjt:12345m66z}} {{#mjt:5'55z}} {{#mjt:77'7z}}
+In this case, since the daiminkan of hatsu finally confirmed an "ensured" daisangen hand in other's view and killed the other possible development of being a non-yakuman:
+: {{#mjt:0000z}}, last: {{#mjt:666'6z}}, second: {{#mjt:5'55z}}, first: {{#mjt:77'7z}} (Opponent's perspective)
+The relationship of liability is no-doubt established for toimen, for becoming the feeder of last required set.
+This rule also implies a useful strategy of gameplay:
+* If a melding confirms an ensured yakuman, the opponents should have avoided discarding such tile to get rid of the liability.
+* If a melding doesn't guarantee a yakuman, the opponents can discard it safely without liability.
 === Yakumans without sekinin barai ===
-In general sekinin barai would not apply to other yakumans, due to the fact that yakuman is not ensured even with all sets are melded. To understand how sekinin barai work, it is better to switch into opponent's perspective: if a melding confirms an ensured yakuman, the opponents should have avoided discarding such tile to get rid of the liability; if a melding doesn't guarantee a yakuman, the opponents can discard it safely without liability.
+In general sekinin barai would not apply to other yakumans, due to the fact that yakuman is not ensured even with all required sets are melded. A common point for these yakuman hands is that they both have some limitation of toitsu (the head pair).
 ==== Shousuushi ====
-Supposing there's a melding completed a [[shousuushi]] hand in main perspective:
-: {{#mjt:13s11z}}, last: {{#mjt:4'44z}}, formers: {{#mjt:33'3z}} {{#mjt:2'22z}},
-However kamicha is not liable to this shousuushi hand. In opponent's view, this hand looks like:
-: {{#mjt:0000z}} {{#mjt:4'44z}} {{#mjt:33'3z}} {{#mjt:2'22z}}
-Such pattern doesn't ensure a yakuman since it can be a general hand with toitoi / honitsu / yakuhai:
 : {{#mjt:4456s}} {{#mjt:4'44z}} {{#mjt:33'3z}} {{#mjt:2'22z}}
-Thus shousuushi is not applied with pao rule.
+: Honitsu + possible yakuhai hand. Shousuushi is not ensured.
-Similarily, pao rule is not applied to [[tsuuiisou]], [[chinroutou]] and [[ryuuiisou]]:
 ==== Tsuuiisou ====
 : {{#mjt:2s}} {{#mjt:6'66z}} {{#mjt:3'33z}} {{#mjt:77"7z}} {{#mjt:4'44z}}