Gyakuten

Discarded winning tile may not be enough for gyakuten.

Gyakuten 「逆転」 is an instance, where a player had passed up the placement of another player during the last hand. Players can either "luck" their way for a last minute win (or improvement in placement); or, they can know the points table. The latter can produce an advantage by having a better idea on the needed tile composition as well as other key decision making options, especially riichi.

Strategy for oorasu

The term normally applies to the last hand of the game. If a player manages to pass up a another player's placement position in this last hand, then the chance to lose the new position is eliminated because the game had ended. Either way, given the last hand, lower placed players must develop their hands in a way, such that gyakuten is possible. On the other hand, players with their desired standing must find a way to retain their position at the end of the game, either by winning the final hand or simply avoid losing points.

Score differences

With essentially the last hand of the game, players have one chance left to make a difference in the game. With that, awareness of point difference is key, which links directly to values from the scoring table. Here, minimal hand values are considered at the very least in order for players to surpass others higher in placement.

Gyakuten table

Using the values from the scoring table, point differences can tell players, which hand values are necessary to accomplish surpassing leading players.

Han-Fu	Non-dealer			Dealer
	Tsumo		Ron	Tsumo	Ron
	Non-dealer diff	Dealer diff
1-30	1400	1600	2000	2000	3000
1-40 & 2-20	1900	2000	2600	2800	4000
1-50 & 2-25	2000	2400	3200	3200	4800
2-30 & 1-60	2500	3000	4000	4000	5800
1-70	3000	3600	4600	4800	6800
2-40 & 3-20 & 1-80	3400	4000	5200	5200	7800
2-50 & 3-25	4000	4800	6400	6400	9600
3-30 & 2-60	5000	6000	7800	8000	11600
2-70	5900	7000	9000	9200	13600
3-40 & 4-20 & 2-80	6500	7800	10400	10400	15400
3-50 & 4-25	8000	9600	12800	12800	19200
4-30 & 3-60	9900	11800	15400	15600	23200
Mangan	10000	12000	16000	16000	24000
Haneman	15000	18000	24000	24000	36000
Baiman	20000	24000	32000	32000	48000
Sanbaiman	30000	36000	48000	48000	72000
Yakuman	40000	48000	64000	64000	96000