Riichi strategy: Difference between revisions

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m (→‎Defense: i think if "3rd is catching up" you might want to riichi)
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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 riichi does give 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.
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, and chase an opponent's riichi, 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 attack.)
** 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 #. Of these factors, point standings and round # are the most important.
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 mangan (or 4 han 30 fu) hand with a bad wait.  
* 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.


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