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Riichi strategy: Difference between revisions
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== Speed == | == Speed == | ||
[[Image:Intimidate riichi.png|thumb|right|250px|[http://tenhou.net/0/?log=2016081218gm-0029-0000-bcaa7251&tw=1&ts=14 Riichi called] to apply pressure onto the other players, with relatively low scoring differentials.]] | [[Image:Intimidate riichi.png|thumb|right|250px|[http://tenhou.net/0/?log=2016081218gm-0029-0000-bcaa7251&tw=1&ts=14 Riichi called] to apply pressure onto the other players, with relatively low scoring differentials.]] | ||
There is an advantage to being the first to tenpai, and thus an advantage to being the first to declare riichi. Only one hand can win per round, so faster hands can | There is an advantage to being the first to tenpai, and thus an advantage to being the first to declare riichi. Only one hand can win per round, so faster hands can win before anyone else. While a non-tenpai hand is limited to [[chii]] and [[pon]], a tenpai hand can ron from any player. The earlier riichi is declared, the harder it is for opponents to defend or attack against it. | ||
Going from [[iishanten]] to tenpai can take a while - even with great [[ukeire|tile acceptance]], it is slow. | |||
*If an iishanten opponent decides to attack | *If an iishanten opponent decides to attack, they will often have to spend multiple turns to achieve tenpai. This means they may need to discard dangerous tiles for multiple turns, which could be tiles you could win with. You could also tsumo before then, or win after they reach tenpai. Of course, the exact speed depends on luck; a player could reach tenpai just after you declare riichi. | ||
*If an opponent at iishanten decides to fold, you will have one less player to worry about. | *If an opponent at iishanten decides to fold, you will have one less player to worry about. | ||
Due to these advantages, a player who declares riichi first will often exert pressure on the other players. This, in turn, can make other players give up their hands. Of course, this is not guaranteed, especially if the point standings force some other players to take on offense at all costs. However, you will still have the advantages listed above. | Due to these advantages, a player who declares riichi first will often exert pressure on the other players. This, in turn, can make other players give up their hands. Of course, this is not guaranteed, especially if the point standings force some other players to take on offense at all costs. However, you will still have the advantages listed above. | ||
Conversely, a chasing riichi (riichi after another player has declared riichi) is weaker for the same reasons. | Conversely, a chasing riichi (riichi after another player has declared riichi) is weaker for the same reasons. | ||
== Hand shape and waits == | == Hand shape and waits == | ||
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=== Winning chance === | === Winning chance === | ||
Pressing players to defend will lower your chance of winning. If a hand has a yaku other than riichi, declaring riichi will generally lower your winrate by about 40%. Since riichi more-than-doubles your score until reaching mangan (1 han from riichi doubles score, then extra han from ippatsu/uradora), riichi generally has | Pressing players to defend will lower your chance of winning. If a hand has a yaku other than riichi, declaring riichi will generally lower your winrate by about 40%. Since riichi more-than-doubles your score until reaching mangan (1 han from riichi doubles score, then potential extra han from ippatsu/uradora), when you are below mangan, riichi will generally has a higher expected value. | ||
If you don't care about points, but you do care about winning, you should dama. As mentioned above, if you are in the lead by a large amount, dama. | If you don't care about points, but you do care about winning, you should dama. As mentioned above, if you are in the lead by a large amount, dama. | ||
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In the first half of the game, your exact point standing (the # of points between you and 1st/2nd/3rd/4th place) is generally not a big concern. There are many opportunities to make up differences : a player who's ahead can hardly afford to rest on their laurels, while players who are behind are not as desperate. Thus, situations tend to be more "general" - riichi's increased reward is usually appreciated, its intimidation effect more often felt, and it is more often a good idea. | In the first half of the game, your exact point standing (the # of points between you and 1st/2nd/3rd/4th place) is generally not a big concern. There are many opportunities to make up differences : a player who's ahead can hardly afford to rest on their laurels, while players who are behind are not as desperate. Thus, situations tend to be more "general" - riichi's increased reward is usually appreciated, its intimidation effect more often felt, and it is more often a good idea. | ||
When the game is closer to its end (usually in the South round; can be earlier if a player is close to bankrupting), the game's precise point standing matters more. Most | When the game is closer to its end (usually in the South round; can be earlier if a player is close to bankrupting), the game's precise point standing matters more. Most places focus heavily on the player's end-of-game placement, so going from 3rd to 2nd is a major jump, and going from 3rd to 4th is a major blow. Even a +1000 point win is valuable if it causes you to rise in placement, or lets you keep your current placement. | ||
*Players that are ahead should be more willing to dama. Late in the game, increasing your point lead doesn't matter as much, but the risk of dealing in matters more. Also, as mentioned above, dama increases your winrate, allowing you to end the game faster. | *Players that are ahead should be more willing to dama. Late in the game, increasing your point lead doesn't matter as much, but the risk of dealing in matters more. Also, as mentioned above, dama increases your winrate, allowing you to end the game faster. | ||
*Meanwhile, players in 4th by a large amount are often forced to riichi, hoping for a big hand. Players in the middle should analyze their own specific situations to determine if riichi is right. If being in 4th place confers a huge penalty (such as high ranked gameplay in [[tenhou.net]] | *Meanwhile, players in 4th by a large amount are often forced to riichi, hoping for a big hand. Players in the middle should analyze their own specific situations to determine if riichi is right. If being in 4th place confers a huge penalty (such as high ranked gameplay in [[tenhou.net]] and [[Majsoul]]), players not in 4th may want to dama to end the game faster, even if riichi could let them rise a place. | ||
*The 1000 points used to declare riichi could cause you to drop down a rank. If this is the case during all last, you probably shouldn't riichi if you have another yaku. | *The 1000 points used to declare riichi could cause you to drop down a rank. If this is the case during all last, you probably shouldn't riichi if you have another yaku. | ||
*If a damaten win and riichi win would cause you to end up in the same placement, and it's all last, you should dama. | *If a damaten win and riichi win would cause you to end up in the same placement, and it's all last, you should dama. | ||