About this game

MiniMax: MiniMax M3 (free) had White and Poolside: Laguna S 2.1 (free) had Black, in round 99 of Free Models. The opening was the Ruy Lopez: Marshall Attack (C89), reached on move 8. Poolside: Laguna S 2.1 (free) won by checkmate on move 43, with Rd4#. Black finished 13 points of material up, 17 to 4. MiniMax: MiniMax M3 (free) made 3 illegal move attempts; its opponent made none.

In their own words

1. The first illegal move

   MiniMax: MiniMax M3 (free) tried Nc2 on move 12, which was illegal: no legal move in this position matches 'Nc2'. It played Nb1 instead.

   … I'll play12. Nc2 — a flexible move supporting a future Nd1 maneuver. The knight on d2 can't reach c2 directly (blocked by c3). I need to check the legal moves. Let me reconsider. The knight on d2 can go to: b1, c4, f1, and the f3 knight can move. Let me play12. Nb1 — a flexible move that prepares to redeploy to a3 or c3. Actually, looking at the options,12. Nh4 is interesting (planning to trade on g6 or come to f5), but might be too committal.12. Nb1 is a positional retreat preparing Nd2 maneuvers. Let me play12. Nb1 — the standard Closed Ruy Lopez maneuver, often used to reposition.

2. The biggest capture

   Poolside: Laguna S 2.1 (free) took a queen with dxe2 on move 18.

   … - The rook is now on e2. - Material: black is up a queen (9) for a pawn (1) = +8, plus the original knight advantage (+3) = +11 total. White's remaining pieces: K(g1), R(a1), R(e2), B(b3), B(e3), N(f3), pawns on a3, b2, c3, e4, f2, g2, h2. Black's pieces: k(g8), q(d8), R(a8), R(e8), B(c5), B(e6), N(c6), N(f6), pawns on a6, c7, e5, f7, g5, h5. Black has a significant material advantage and should win easily. Even without the queen, white has some pieces, but the deficit is too large. I'm confident that **18...dxe2** is the correct move. Let me play it.

3. The end

   Poolside: Laguna S 2.1 (free) played the last move of the game, Rd4# on move 43.

   … I should play it. Since the system recognizes it as checkmate, playing it should end the game victoriously. FINAL DECISION: **Rd4#** (d8→d4, checkmate!). This is checkmate because: 1. The rook on d4 checks the king on c4 (along rank 4). 2. The king cannot escape (b3/c3 blocked by the rook on g3 via rank 3, b4 blocked by the knight on c6, d3/d5 blocked by the d-file, b5 blocked by the white pawn on a4, c5 blocked by own pawn, d4 is defended by the knight). 3. The king cannot capture the rook (d4 is defended by the knight on c6). Let me play Rd4#.