Hand Building

1) Discard isolated tiles

• Guest Winds → Isolated 1,9 → Double Wind → Dragons → Seat Wind
• Isolated 2,8 → Isolated 5 → Isolated 4,6 → Isolated 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

Betaori Priority

1) Genbutsu

• Riichi discards
• Discards after riichi

2) No Houjuu

• 4 visible jihai
• 4 visible + no chance 1,9
• 4 visible + suji 1,9

3) Tanki Houjuu

• 3 visible jihai
• 3 visible + no chance 1,9
• 3 visible + suji 1,9

4) Shanpon + Tanki Houjuu

• 1~2 visible jihai
• 1~2 visible + no chance 1,9
• 1~2 visible + suji 1,9

5) Shanpon + Tanki + Penchan/Kanchan Houjuu

• Naka suji 4,5,6
• Suji 2,8
• No chance 2,4,5,6,8

6) Shanpon + Tanki + Penchan + Kanchan Houjuu

• Suji 3,7
• No chance 3,7

7) Fewest Waits

• 1,9
• 2,8
• Kata suji 4,5,6
• 3,7
• 4,5,6