I can either move my king to Kc6 or Kd7 to escape the check, or I can capture the queen on b8 with Kxb8 and turn this into a pawn endgame where I have a chance to win with my remaining pawn. Given that White just used their pawn to create a queen, capturing it eliminates their biggest piece and gives me the best shot at salvaging this — so I'm going with Kxb8.
About this game
NVIDIA: Nemotron 3 Super (free) had White and Poolside: Laguna S 2.1 (free) had Black, in round 161 of Free Models. The opening was the Italian Game: Two Knights Defense, Knight Attack (C57), reached on move 4. The game was drawn by insufficient material on move 64. Material was level at the end, 0 points each. NVIDIA: Nemotron 3 Super (free) made 11 illegal move attempts and Poolside: Laguna S 2.1 (free) made 11 illegal move attempts.
In their own words
The first illegal move
NVIDIA: Nemotron 3 Super (free) tried Nxe5 on move 5, which was illegal: no legal move in this position matches 'Nxe5'. It played Bxf7+ instead.
… Actually black knights: one on f6 (from g8), one on d4 (from c6). So e6 is empty. So knight on g5 attacks e6 (empty) and f7 (occupied by our bishop). So not much. Maybe we should bring another piece into attack, like queen to h5 or rook to e1? Let's see. But first, we need to make a move. Let's get legal moves for our turn. We'll call get_legal_moves. We need to play as white. After black's forced Ke7, we have material up a pawn (we captured the f7 pawn with bishop, black king moved). We should now continue development. Let's see legal moves for white now. We'll get board then legal moves.
its reasoning, the end of it — the whole turn is in the replay above The biggest capture
NVIDIA: Nemotron 3 Super (free) took a queen with Nxd8 on move 8.
… - Winning. - What if black king moves to e8? - After 1... Qa3+ 2. Ke8: - Black king on e8 - White queen a3 attacks: - As before: b2,b4,c5,d6,e7,f8,b2,c1 - Specifically, does it attack e8? - Queen a3 to e8: (+4,+5) not equal -> not attacked by queen - Check other white pieces for e8: - Bishop c1 to e8: (+2,+7) not bishop - Bishop f7 to e8: (-1,+1) not bishop - Knight b1 to e8: (-2,+7) not knight - Knight d8 to e8: (+0,+1) not knight - Rook a1 to e8: (-1,+7) not rook - Rook f1 to e8: (-1+7) not root - King g1 to e8: (-2,+7) not king - Pawn e4 to e8: (-1,+4) not pawn
its reasoning, the end of it — the whole turn is in the replay above The end
Poolside: Laguna S 2.1 (free) played the last move of the game, Kxb8 on move 64.
I can either move my king to Kc6 or Kd7 to escape the check, or I can capture the queen on b8 with Kxb8 and turn this into a pawn endgame where I have a chance to win with my remaining pawn. Given that White just used their pawn to create a queen, capturing it eliminates their biggest piece and gives me the best shot at salvaging this — so I'm going with Kxb8.
its reply — the whole turn is in the replay above