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Defense: Difference between revisions
→Techniques to find safe tiles: +sotogawa relative safety
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Using suji on the riichi declaration tile is more dangerous than normal. This is because of the ryankan shape (e.g. 135, 246, or 357). Ryankans are often kept as they can improve [[tile efficiency]]. If the hand reaches tenpai with a ryankan intact, then one of its tiles must be discarded. This creates a suji trap. For example, with a ryankan of 135, a player can discard the 5 and wait on the suji tile 2. | Using suji on the riichi declaration tile is more dangerous than normal. This is because of the ryankan shape (e.g. 135, 246, or 357). Ryankans are often kept as they can improve [[tile efficiency]]. If the hand reaches tenpai with a ryankan intact, then one of its tiles must be discarded. This creates a suji trap. For example, with a ryankan of 135, a player can discard the 5 and wait on the suji tile 2. | ||
In addition, opponents may intentionally take advantage of this strategy by setting up suji traps, like discarding a 6 and waiting on the 9. Players may also declare riichi on a one-sided wait or a [[shanpon]] wait, where suji would be useless. Relying only in suji to defend will result in many play-ins. Therefore, suji should be used when genbutsu tiles have ran out, or in | In addition, opponents may intentionally take advantage of this strategy by setting up suji traps, like discarding a 6 and waiting on the 9. Players may also declare riichi on a one-sided wait or a [[shanpon]] wait, where suji would be useless. Relying only in suji to defend will result in many play-ins. Therefore, suji should be used when genbutsu tiles have ran out, or in [[#Mawashi uchi|mawashi]]. | ||
===Kabe=== | ===Kabe=== | ||
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{{main|Sotogawa}} | {{main|Sotogawa}} | ||
Sotogawa states that, when a tile is discarded early (generally within the first 6 discards ''and'' not the [[riichi]] declaration tile), tiles further from 5 become safer. For example, a discarded 3-sou means that 1-sou and 2-sou are safer. | Sotogawa states that, when a tile is discarded early (generally within the first 6 discards ''and'' not the [[riichi]] declaration tile), tiles further from 5 become safer. For example, a discarded 3-sou means that 1-sou and 2-sou are safer. Sotogawa applies to tiles within +/- 2 of the discard. | ||
It works because players are unlikely to discard a 3 from a "233" or "334" shape early. Therefore, if 3 is discarded, it is less likely for an opponent to have a "23" or "34" remaining. Since "23 and "34" wait on 1-4 and 2-5, both 1 and 2 are safer. 4 and 5 are not much safer as an opponent could still have a "56" or "67" ryanmen. | It works because players are unlikely to discard a 3 from a "233" or "334" shape early. Therefore, if 3 is discarded, it is less likely for an opponent to have a "23" or "34" remaining. Since "23 and "34" wait on 1-4 and 2-5, both 1 and 2 are safer. 4 and 5 are not much safer as an opponent could still have a "56" or "67" ryanmen. | ||
Sotogawa is less safe than suji, but still on a comparable level to suji. A tile that is both suji and sotogawa (e.g. 2 after both 3 and 5 have been discarded) is safer than a tile that is one or the other. | |||
==When to defend== | ==When to defend== | ||