This article is about discarding sequence to make Suji trap more effective without lowering tile efficiency.
Hi all, thank you for checking this website! These days it is common that suji of riichi declared tile is dangerous. For example, if the player riichi with 5p, 2p and 8p got to be quite dangerous tile. So if your hand’s wait will be like this, you should consider the sequence to discard the tiles.
Drawed r5s and this hand suddenly looks better. The best result will be Iipeikou of Souzu(445566) and what should I discard now ? Candidate will be 9p, 8p, 6s, and 2s.
If you discard 9p, the effective tile for Tenpai will be 1px2+8px2+3sx4+5sx3=11 tiles
If you discard 8p, the effecitve tile will be 7px3+ 3sx4+5sx3=10 tiles
If you discard 6s, the effecitve tile will be 1px2+8px2+ 7px3+ 3sx4=11 tiles
If you discard 2s, the effecitve tile will be 1px2+8px2+ 7px3+ 5sx3=10 tiles
So almost same effective tiles to Tenpai. in this case, you should consider 1. expected winning score and 2. the quality of wait.
Consider these 2 points, you should discard 2s now to fix 44566s. With this sequence, 1. the expected score of this hand will be higher because Iipeikou is promised. and 2. the possibility that other players discard 5s will raise even if you Riichi. If you discard 9p or 8p now, riichi declaring tile will be 2s. In this case, 5s will be regarded as one of the dangerous tile. Especially in this case, it is hard for them to use 5s in their hand because we already have 4sx2 and 6sx2, so if they don’t regard 5s as dangerous tile, they may discard it if they don’t have safe tile.
After that, I drawed 7p and riichi-ed. Sooner I drawed 5s.
Yes, I was lucky enough to win Mangan, but it is important to choose best tile to capture that luck.