Spending 10 months building the most human-like chess bot

Automated excerpt

So how does Chessbook-1 do on Maia-3’s own terms: blitz games, with the time scrambles filtered out? Top-1 move prediction accuracy by rating bandShare of positions where the model's most likely move is the one the human played. 28,000 Lichess blitz positions from September 2026. 40%50%60%70%600100014001800220024002600+Player rating (Lichess)Chessbook-1, 600-1000: 46. 946. 9Chessbook-1, 1000-1400: 53. 353. 3Chessbook-1, 1400-1800: 54. 954. 9Chessbook-1, 1800-2200: 59. 159. 1Chessbook-1, 2200-2400: 61. 361. 3Chessbook-1, 2400-2600: 61. 661. 6Chessbook-1, 2600+: 63. 563. 5Maia-3, 600-1000: 48. 148. 1Maia-3, 1000-1400: 53. 653. 6Maia-3, 1400-1800: 55. 555. 5Maia-3, 1800-2200: 59. 259. 2Maia-3, 2200-2400: 60. 660. 6Maia-3, 2400-2600: 61. 661.

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