We have a problem: the move Nxe5 is not legal. Let's look at the board state. The FEN after 13.c3 d5 is "r1bqk2r/ppppbppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQ1RK1 w KQkq - 3 6". Then black played Kxf7, which means the black king captured something on f7. What was on f7? The pawn on f7 was there, so after Kxf7, the pawn is gone, and the king is on f7. Then it's white's turn (ply 17). So the current position is after 14... Kxf7. Let's reconstruct the board after 14... Kxf7: - White pieces: king g1, queen d1, rooks a1 f1, knights b1 f3, bishops c1 c4, pawns a2 b2 c3 d4 e4 f2 g2 h2. - Black pieces: king f7, queen d8, rooks a8 h8, knights b8 f6, bishops c8 f8, pawns a7 b7 c7 d5 e5 f7 (pawn on f7 is gone, captured), g7, h7. Now white to move. Let's see the legal moves from the position after 14... Kxf7. The legal moves listed in the last get_legal_moves response (which was after 13.c3) include "exd5" (capture e4xd5), "Nxe5" (knight f3 to e5), etc. But after Kxf7, the board changes, so those moves may not be valid anymore. Let's see the current position after 14... Kxf7: - White pawn on e4 is still there. - Black pawn on d5 is there. - Black king is on f7. - White knight on f3 is still there. - White bishop on c4 is still there. - White pawn on e4 is on e4. - Black pawn on e5 is still there. So white can capture the pawn on e5 with the knight from f3 (Nxe5), which would be a legal move. But earlier attempts to make Nxe5 were rejected. Why? Let's see why. In the first attempt, the FEN was "r1bqk2r/ppppbppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQ1RK1 w KQkq - 3 6" (after 13.c3). Then we tried Nxe5, which was illegal because the knight couldn't reach e5? But after Kxf7, the board changes, so maybe Nxe5 is now legal. Wait, the FEN after 14... Kxf7 is "r1bq3r/ppp1bkpp/2n2n2/3p4/4P3/2P5/PPPP1PPP/RNBQ1RK1 b - - 0 9" (from the second tool response). Let's check that FEN: "r1bq3r/ppp1bkpp/2n2n2/3p4/4n3/2P5/PPPP1PPP/RNBQ1RK1 w - - 0 9" Breaking it down: - Rank 8: r . b q k . . r (r at a8, b at c8, q at d8, k at e8, . at f8, . at g8, r at h8) — but wait, the king is on f7, so maybe the FEN is wrong? Wait, the FEN after 14... Kxf7 should have the king on f7, so the FEN should have a king on f7, not e8. Let's check the FEN in the second tool response: "r1bq3r/ppp1bkpp/2n2n2/3p4/4n3/2P5/PPPP1PPP/RNBQ1RK1 w - - 1 9". Let's parse this FEN: - Rank 8: r . b q k . . r (r at a8, . at b8, b at c8, q at d8, k at e8, . at f8, . at g8, r at h8) — but the king is on e8, not f7. That suggests that the FEN after 14... Kxf7 might not be correctly represented, or maybe the Kxf7 move was not actually made, or the FEN is incorrect. Wait, the FEN in the second tool response is "r1bq3r/ppp1bkpp/2n2n2/3p4/4n3/2P5/PPPP1PPP/RNBQ1RK1 w - - 1 9
About this game
NVIDIA: Nemotron 3 Nano Omni (free) had White and NVIDIA: Nemotron 3 Super (free) had Black. The opening was the Italian Game: Two Knights Defense (C55), reached on move 3. NVIDIA: Nemotron 3 Nano Omni (free) forfeited on move 10, after 5 illegal attempts in a row. Black finished 4 points of material up, 37 to 33. NVIDIA: Nemotron 3 Nano Omni (free) made 11 illegal move attempts; its opponent made none.
In their own words
The first illegal move
NVIDIA: Nemotron 3 Nano Omni (free) tried Bxb6 on move 5, which was illegal: no legal move in this position matches 'Bxb6'. It played Bxf7+ instead.
… She could go to f7 via a different path: d1-e2-f3-g5-h6? Not. - Queen d1 to f7 via a different line: maybe via a rook file? Not. - Rook f1: can go up file to f7 if path clear: squares f2 (pawn), f3 (empty), f4 (empty), f5 (empty), f6 (knight), f7 (bishop). Pawn on f2 blocks. - Rook a1: cannot. - Bishop c1: diagonal to f4, g5, h6, etc., not f7. - Bishop f1: diagonal to g2, h3, e2, d3, c4, b5, a6, g0 (offboard). Not f7. - Knight f3: attacks g5, h4, e5, d4, d2, e1, g1, h2. Not f7. - Knight b1: attacks a3, c3, d2, a5, c5, d4, e3 divice el servicio necesario?
its reasoning, the end of it — the whole turn is in the replay above The biggest capture
NVIDIA: Nemotron 3 Super (free) took a bishop with Kxf7 on move 5.
… Actually black pawn on f7 was captured, so black has pawns on a7,b7,c7,d7,e5? Wait e5 is occupied by black pawn? No, black pawn moved from e7 to e5 earlier? Actually black played e5 on move 2, so black pawn is on e5. Then after Bxf7+, the bishop is on f7, black king on e8. After Kxf7, black king captures bishop on f7, so black king now on f7, black pawn still on e5. So black has pawn on e5 and king on f7. White has pawn on e4 and king on g1 (castled). So black is up a bishop (3) for a pawn (1) net +2. Good. Now I need to wait for white's move. I'll respond after white moves.
its reasoning, the end of it — the whole turn is in the replay above The end
NVIDIA: Nemotron 3 Nano Omni (free)'s last turn on move 10 ended the game without a move.
… - "h3", "h4" are pawn moves from h2. So the most logical move here is exd5, which captures the pawn on d5. Let's check if that's legal. The pawn on e4 can capture the pawn on d5 (e4xd5), which is a standard pawn capture. The pawn on e4 is on e4, and d5 is one square diagonally forward left from e4. Since the pawn on d5 is on d5, which is a valid capture square, exd5 should be legal. Let's confirm with the move list: "exd5" is listed as a legal move (with "capture": true), so it's valid. So we should make exd5.
its reasoning, the end of it — the whole turn is in the replay above