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Matagi suji: Difference between revisions
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split theory into early discards and riichi declaration
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*When a tile numbered 2 or 8 is discarded, the 1-4 or 6-9 tiles are affected by matagi suji. | *When a tile numbered 2 or 8 is discarded, the 1-4 or 6-9 tiles are affected by matagi suji. | ||
==Table== | ==Theory== | ||
Matagi suji relies on the power of a shape like "233" or "334", which are rarely discarded from early, but often discarded late. | |||
===Early discards=== | |||
{{Main|Sotogawa}} | |||
When a player has a "233", it is unlikely for them to discard a 3 early - turning "233" -> "23" - since it'd come at a loss of [[tile efficiency]]. So if a 3 is discarded early, it is less likely for them to have "23" (which waits on 1-4) or "34" (which waits on 2-5) remaining. Therefore, an early discarded 3 makes both 1-4 and 2-5 into matagi suji. | |||
The tiles towards the outside (1 & 2 in this example) are known as [[sotogawa]] and are significantly more safe than normal. Tiles towards the inside (4 & 5) are not much safer; the 4 actually becomes more dangerous than normal due to [[ura suji]]. To summarize: | |||
* Both tiles towards the outside become safer due to [[sotogawa]]. | |||
* The adjacent tile towards the inside becomes more dangerous due to [[ura suji]]. | |||
* The 2-away tile towards the inside is a bit safer, but not by much. Middle tiles are still very dangerous whether matagi suji or not. | |||
===Riichi declaration tile=== | |||
Conversely, it is more likely for a player to keep shapes like "233" until just before [[tenpai]]. So if a 3 is discarded as the [[riichi]] declaration tile, it is more likely for them to have a "23" or "34" remaining. This means a late discarded 3 makes 1-4 and 2-5 more dangerous. | |||
Note: if the riichi declaration tile was a tsumogiri tile (discarded right after drawing it), then tiles near the last non-tsumogiri tile become dangerous instead. | |||
===Table=== | |||
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== | ===Effectiveness=== | ||
"Tiles outside of early discards" are relatively safe; about as safe as regular [[suji]] (but a bit less safe). | |||
"Tiles nearby the riichi declaration tile" are more dangerous. But, when [[fold]]ing, there usually isn't a need to consider matagi suji. A 4 discarded as a riichi declaration does make the 5 more dangerous, but a non-suji 5 is already very dangerous. It can make an impact when deciding whether to push or fold, though. | "Tiles nearby the riichi declaration tile" are more dangerous. But, when [[fold]]ing, there usually isn't a need to consider matagi suji. A 4 discarded as a riichi declaration does make the 5 more dangerous, but a non-suji 5 is already very dangerous. It can make an impact when deciding whether to push or fold, though. | ||
==External links== | ==External links== | ||