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Marathon
Streak: 0
Avg: —
0:00
Difficulty
Theme Filter
All
Mate
Fork
Pin
Skewer
Discovery
Hanging
Endgame
Sacrifice
| # |
Player |
Streak |
Avg Rating |
Best |
Time |
Date |
No marathons yet. Start a marathon and solve puzzles without hints!
Changelog
v1.32 — March 2026
- AI move analysis — hover top moves to see arrows on the board, click to override AI's choice (analysis mode)
- Probability bars — visual move confidence bars with gradient highlight on chosen move
- PGN import — paste any PGN with headers into the editor or replay to view games
- AI puzzle descriptions — LLM-generated tactical briefings for each puzzle via Gemini
- Server-side game state — anti-cheat: server validates every move and determines results
- Replay upgrade — new Chessground board with arrows, last-move highlighting, check indicators
v1.31 — March 2026
- New board — smoother animations, last-move & check highlighting, legal move dots, better mobile touch
- Puzzle Marathon — streak-based leaderboard, solve puzzles in a row without hints to rank
- Puzzle result modal — board snapshot, rating change, solution replay on demand
- Puzzles — tactical training with Lichess puzzle database, difficulty & theme filters, streak tracking, puzzle Elo
- About page — project story, goals, and technical details
v1.3 — March 2026
- Model V3 — hybrid CNN + Transformer with latent thought tokens, ~2700 Elo (Stockfish 60% score)
- 2-ply lookahead — negamax search with quiescence and policy-guided veto
- Security hardening — rate limit bypass fix, game result tampering prevention
v1.21 — March 2026
- PGN notation — copy, load, and replay games in standard chess notation
- Smarter Edit — Edit passes current position, Play from here opens editor
- Mobile experience — tap-to-move with legal move dots, responsive board
- Replay improvements — controls under board, Moves/PGN tab toggle
- Better game stats — full move count, per-model win rates, time tiebreaker
- Draw details — stalemate, threefold repetition, 50-move rule
- AI thinking spinner — animated indicator during AI turn
- AI performance graph — AI vs human win rate trend over time
v1.2 — March 2026
- New Model V2 — trained on ~100M positions (vs 9.5M in V1), Elo ~2200 (vs ~1800)
- Multi-ply search — fewer blunders thanks to negamax with quiescence search
- Separate leaderboards per model version (V1 / V2)
- Player Elo — optional rating shown in leaderboard
v1.1 — March 2026
- Board editor — set up any position and play vs AI
- Promotion picker — choose piece on pawn promotion
- Dynamic OG images — per-game board preview when sharing
- Leaderboard mini stats — total games, win rate, ranked count
- Replay “Play from here” — continue any position vs AI
- Game-over modal — SVG board with move count and stats
- Forfeit tracking — abandoned games marked as AI wins
v1.0 — March 2026
- Initial release — play chess vs neural network
- 1-ply value search with policy head
- Leaderboard with game replays