Riichi score tracker

How to use it

1. Type the names in seat order, starting with the first dealer, and pick an uma preset. Start the game.
2. After each hand, pick Ron, Tsumo, Draw or Chombo, fill in the winner and the han and fu, and tick anyone who declared riichi. The preview shows every player's change before you record it.
3. The tracker moves the dealer, counts honba and keeps riichi sticks on the table until someone wins them.
4. Made a mistake? Undo last removes the newest hand.
5. When the game ends you get placements and results with uma and oka. Finished games feed the session stats.
6. Use Export JSON to keep a backup or move your history to another phone, and Import JSON to load it back.

Rules this tool assumes

• Points from the standard riichi table. Kiriage mangan off unless you tick it at setup.
• Tenhou-style uma by default: 25,000 start, 30,000 return, +20/+10/-10/-20, oka to first. M-League, EMA, Mahjong Soul and custom presets are one click away.
• Ties go to the player closer to the first dealer.
• The dealer keeps the deal on a win or tenpai at a draw. Each repeat or draw adds a honba.
• Tenpai payments are 3,000 split (2,000 in three-player). Players in riichi count as tenpai.
• Double ron is allowed. The winner closest to the discarder takes the honba and the sticks.
• The game ends after South 4 (or East 4), when someone drops below zero, or when the all-last dealer keeps the deal in first place. Riichi sticks left at the end go to first.
• A chombo pays a reverse mangan or your own amount, and the hand is replayed.
• Three-player games use tsumo loss: a tsumo has two payers.
• Your games stay in this browser. Nothing goes to a server and there's no account.