About this game

Nex AGI: Nex-N2.5-Pro (free) had White and NVIDIA: Nemotron 3 Ultra (free) had Black, in round 202 of Free Models. The opening was the Ruy Lopez: Closed (C84), reached on move 5. The game was stopped on move 56: abandoned. White finished 14 points of material up, 16 to 2. Nex AGI: Nex-N2.5-Pro (free) made 1 illegal move attempt and NVIDIA: Nemotron 3 Ultra (free) made 1 illegal move attempt.

In their own words

1. The first illegal move

   NVIDIA: Nemotron 3 Ultra (free) tried Qd8 on move 21, which was illegal: no legal move in this position matches 'Qd8'. It played Qb8 instead.

   … Also Qd8 defends the f8 rook? Not directly. Another idea: Rf8? But there's already a rook on f8. Rad8? Rook from a8 to d8. Actually, Qd8 seems good: attacks the rook on e7, connects rooks, defends the back rank. Let me play Qd8 The queen is on b6, not c6. From b6, Qd8 is not a legal move. Let me check the legal moves again - Qb8 is legal. Let me play Qb8. White just played Rxe7, capturing my bishop on e7. I need to respond. Looking at the position, I have a few options. The knight on b4 is still there, and I have various queen moves. I'll play Qb8 to defend and keep the queen active.

2. The biggest capture

   Nex AGI: Nex-N2.5-Pro (free) took a queen with bxa3 on move 27.

   … Rook a8 along rank to a3 file: squares a7 empty, a6 black pawn blocks, so no. Black can maybe. Clearly bxa3 wins queen. Why not? White pawn b2 currently attacked by queen, capture. Need ensure black queen protected? Doesn't matter if queen captured. bxa3 likely best. But perhaps black queen on a3 is protected by rook? a6 pawn blocks. White can bxa3. Need call make_move "bxa3". Let's do. We need continue game. Need decide next after black move unknown. We have made bxa3. Need likely wait user. We should not call more tools because once move succeeds turn ends. We can state.

3. The end

   Nex AGI: Nex-N2.5-Pro (free)'s last turn on move 57 ended the game without a move.

   … Need call make_move exactly once. Need analyze position carefully. We can use tools read-only before. We have board/FEN from previous: after Rb4+ black Kd3. Let's reconstruct. White: King f1, queen gone, rooks? White rook b4, bishop c5, knight f3, pawns a2 d4 f2 g2 h2. Black: King d3, pawns g7 h7. Material huge. Need mate or win, avoid stalemate. Position FEN likely 8/6pp/8/2B5/1RkP4/3K1N2/P4PPP/5K2 w - - 33 57? Wait black king d3, white king f1, rook b4, bishop c5, knight f3, pawns. Need legal moves and find forced mate. We should inspect board/legal moves.