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Riichi strategy: Difference between revisions
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''For strategy regarding riichi mahjong itself, see [[Strategy]]'' | ''For strategy regarding riichi mahjong itself, see [[Strategy]]'' | ||
Calling [[riichi]] comes with various considerations. While | Calling [[riichi]] comes with various considerations. While it gives a high score bonus, it also alerts players that you are in tenpai, and prevents you from [[defense|defending]]. Therefore, some discretion should be used before declaring riichi. | ||
== Assessing riichi == | == Assessing riichi == | ||
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* They have no option to defend. | * They have no option to defend. | ||
* They have a strong hand. | * They have a strong hand. | ||
** If tenpai happens to be reached with a good wait | ** If tenpai happens to be reached with a good wait after an opponent's riichi, then declaring chasing riichi is strong. Your win rate far exceeds the deal-in rate. (If the hand is still iishanten when the first riichi is declared, a very strong hand is needed to "full" attack.) | ||
When you do have the option to defend, the decision to push or fold should depend more on [[shanten]], [[tile acceptance]], and wait rather than the value of the hand. | When you do have the option to defend, the decision to push or fold should depend more on [[shanten]], [[tile acceptance]], and wait rather than the value of the hand. | ||
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== (Average) riichi criteria == | == (Average) riichi criteria == | ||
With all these factors in mind, the following is a rough guideline of when to and not to riichi. This list should be taken with a grain of salt - they may change based on the exact hand composition, your opponents hands/discards, point standings, round #, and the current turn # | With all these factors in mind, the following is a rough guideline of when to and not to riichi. This list should be taken with a grain of salt - they may change based on the exact hand composition, your opponents hands/discards, point standings, round #, and the current turn #. | ||
'''Do riichi:''' | '''Do riichi:''' | ||
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* When first to tenpai, bad wait, 2-4 han after riichi. A 2 han 40 fu hand (e.g. riichi tanyao) is also stronger than damaten. | * When first to tenpai, bad wait, 2-4 han after riichi. A 2 han 40 fu hand (e.g. riichi tanyao) is also stronger than damaten. | ||
* When declaring chasing riichi, with a hand worth pushing, if it's at/below mangan post riichi. | * When declaring chasing riichi, with a hand worth pushing, if it's at/below mangan post riichi. | ||
Note: "First to tenpai" also assumes it is before the 3rd row of discardeds (turn 12 or earlier). Past turn 12, it can still be worthwhile to riichi, but beware of [[dama]]/open tenpai. | |||
'''Don't riichi:''' | '''Don't riichi:''' | ||
* With a bad wait riichi-only hand. | * With a bad wait riichi-only hand. | ||
* With haneman or higher hands. | * With haneman or higher hands. | ||
* With a | * With a 4 han bad wait hand. | ||
* With an extreme amount of upgrades. The amount of upgrades need to be very high to skip tenpai. In the early game, to delay tenpai there should be: 6 types of tiles (~24 tiles total) for a wait upgrade, or 4 types (~16 tiles total) to double value. | ** A 4 han good wait hand should call riichi if its early in the game, but dama when late in the game. | ||
* With an extreme amount of upgrades. The amount of upgrades need to be very high to skip tenpai. In the early game, to delay tenpai there should be: 6 types of tiles (~24 tiles total) for a wait upgrade, or 4 types (~16 tiles total) to double value. As the game proresses, an even larger # of upgrades is needed to beat riichi. | |||
* After point standing analysis. You don't need to riichi with a large lead in all last, or if dama would result in you taking 1st during all last. | * After point standing analysis. You don't need to riichi with a large lead in all last, or if dama would result in you taking 1st during all last. | ||