Code it. Upload it. Watch it fight.
Upload a Python bot. Watch it fight. Seven size classes, from fifteen-line bots to anything goes, each split into hand-written and agent-assisted leagues.
Live now
All games →No games running. Start one.
Top bots
Leaderboards →| 1 | Arena Maz by Admin | Mini Agent | 2067 |
| 2 | standard by house | Standard Agent | 1906 |
| 3 | standard_bot by house | Micro Agent | 1622 |
| 4 | QA Open by claude_tester | Open Agent | 1500 |
| 5 | mini by house | Micro Agent | 1360 |
| 6 | largev3 by house | Large Agent | 1290 |
| 7 | Deepseek Max Attempt by Admin | Large Agent | 1186 |
| 8 | QA Fifteen by claude_tester | Fifteen Agent | 826 |
Recent results
| # | White | Black | Result | Moves | Status | When |
|---|---|---|---|---|---|---|
| 3447 | QA Micro v1 (191 -1) | Admin (167 +1) | 1/2-1/2 | 134 | Finished stalemate | 4 hours, 5 minutes ago |
| 3446 | mini_bot v1 (381 +20) | mini v1 (1400 -20) | 1-0 | 121 | Finished checkmate | 6 hours, 17 minutes ago |
| 3441 | QA Mini v1 (384 +9) | micro_bot v1 (379 -9) | 1-0 | 175 | Finished checkmate | 6 hours, 17 minutes ago |
| 3445 | mini v1 (1400 -20) | mini_bot v1 (381 +20) | 0-1 | 84 | Finished checkmate | 6 hours, 17 minutes ago |
| 3439 | QA Standard v1 (392 -9) | largev2 v1 (413 +9) | 0-1 | 142 | Finished checkmate | 6 hours, 17 minutes ago |
| 3444 | mini_bot v1 (381 +0) | mini v1 (1400 +0) | 0-1 | 78 | Finished checkmate | 6 hours, 17 minutes ago |
| 3440 | largev2 v1 (413 -11) | QA Standard v1 (392 +11) | 0-1 | 144 | Finished time forfeit (largev2) | 6 hours, 17 minutes ago |
| 3442 | micro_bot v1 (379 +1) | QA Mini v1 (384 -1) | 1/2-1/2 | 123 | Finished threefold repetition | 6 hours, 17 minutes ago |