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Iishanten: Difference between revisions
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=== Yojouhai === | === Yojouhai === | ||
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'''Floating tile iishanten''' {{kana|余剰牌}} describes the case where there are two complete groups and a pair, with two incomplete groups waiting to be completed. One tile (the East tile in the example hand) does not contribute to any group, and so is said to be floating. | '''Floating tile iishanten''' {{kana|余剰牌}} describes the case where there are two complete groups and a pair, with two incomplete groups waiting to be completed. One tile (the East tile in the example hand) does not contribute to any group, and so is said to be floating. | ||
=== | === Kanzenkei === | ||
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'''Complete iishanten''' {{kana|完全形、完全イーシャンテン}} is an improvement on floating iishanten when all tiles in the hand contribute to the iishanten. In the example hand, the | '''Complete iishanten''' {{kana|完全形、完全イーシャンテン}} is an improvement on floating iishanten when all tiles in the hand contribute to the iishanten. In the example hand, the 223s group now has three tiles working together. This hand is also an example of '''perfect iishanten'''. Perfect iishanten is a special type of complete iishanten that guarantees a ryanmen wait. If we draw 1469s, we can discard 4s for a multisided wait. If we draw 2s or 2p, we discard 3s to wait on completing the 78s group. | ||
=== Atamanashi === | === Atamanashi === | ||
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'''Headless iishanten''' {{kana|頭なし、ヘッドレス}} is a hand where we have three complete groups, no pair, and one or two incomplete groups. An ideal headless hand will have two ryanmen groups waiting to be completed. If either of these groups completes, then the hand becomes tenpai with a tanki wait. If we pair one of the four tiles, then we can discard the other tile in its incomplete group to get a ryanmen wait on the other incomplete group. | '''Headless iishanten''' {{kana|頭なし、ヘッドレス}} is a hand where we have three complete groups, no pair, and one or two incomplete groups. An ideal headless hand will have two ryanmen groups waiting to be completed. If either of these groups completes, then the hand becomes tenpai with a tanki wait. If we pair one of the four tiles, then we can discard the other tile in its incomplete group to get a ryanmen wait on the other incomplete group. | ||
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With an ankou in the hand, the above shape becomes even more advantageous. The completion of either of the ryanmen can bring about pinfu by discarding one tile from the ankou and use the remaining two as the pair. | With an ankou in the hand, the above shape becomes even more advantageous. The completion of either of the ryanmen can bring about pinfu by discarding one tile from the ankou and use the remaining two as the pair. | ||