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 or pick the EMA preset.
• 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 EMA preset splits the uma, the oka and the leftover sticks between tied players instead.
• 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. The EMA preset plays on below zero and through an all-last dealer win, as the EMA 2025 rules do. Riichi sticks left at the end go to first.
• The extra round is on for the Tenhou, Mahjong Soul and 3-player standard presets. If first place is under the target when South 4 (or East 4) passes the deal, play goes into the next wind. Both sites set the target at 30,000 for four players and 40,000 for three, and neither plays past that wind's last hand. At all last, a dealer who wins or is tenpai deals again unless they're first at the target. Tenhou keeps that rule in the extra wind, which stops after the first hand that passes the deal with someone at the target. The 3-player standard preset plays it Tenhou's way. Mahjong Soul ends the extra wind as soon as anyone reaches the target, even on the dealer's own win or tenpai. The exception is a double ron the dealer won a share of, which follows the all-last rule.
• 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, and each adds 100 a honba. A ron adds 300 a honba on Mahjong Soul rules or 200 on Tenhou rules. Pick one at setup.
• Your games stay in this browser. Nothing goes to a server and there's no account.