Hand Building

1) Discard isolated tiles

Jihai (non-yakuhai) → 1,9 → yakuhai → 2,8 → 3~7

2) 6 blocks → 5 blocks

3rd pair → penchan → outer kanchan → inner kanchan → 2nd pair → ryanmen

3) 5 blocks → tenpai

When you have 2 pairs: weakest multi-wait → pair

When you have 3 pairs: strongest multi-wait → wait

Overlapping Waits

1224 (penchan + kanchan)

Break in favour of isolated 2,8 or above

1334 / 1245 (kanchan + ryanmen / penchan + ryanmen)

Break in favour of isolated 3~7 or above

1122 / 1133 (penchan + penchan / kanchan + kanchan)

Break in favour of ryanmen, keep in favour of isolated tiles

12 tile acceptance if broken in favour of kanchan/penchan, 10 tile acceptance + iipeikou chance if kept

2356 / 2233 (ryanmen + ryanmen)

Break in favour of ryanmen

Nakabure Head Priority

Prioritize Head

When you have 2 ryanmen or 1 away from iipeikou

Prioritize run

When you have gukei (kanchan/penchan), ankou, ryanmen + run (e.g. 34556 or 45678)