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Analysis: AndMatSim vs erivera90

Date: 2026.03.27 | Event: Live Chess | Site: Chess.com

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Evaluation

Your moves Opponent moves

Found 4 crucial moments (3 blunders, 1 missed opportunity).

Moment 1 — Blunder CRITICAL ↗

Trapped Piece

FEN: r1bqkbnr/pp1ppp1p/4P1p1/8/2BQ4/8/PPP2PPP/RNB1K2R b KQkq - 0 8

You Played: d5
Engine Best: f6
Eval Swing: -971 cp
Variation: f6 exd7+ Qxd7 Qc3

Refutation: Bb5+ Bd7 exd7+ Qxd7

Coach Explanation

d5 is a mistake because White can play Bb5+, followed by Bd7 exd7+ Qxd7. This sequence wins a pawn. f6 is superior because it avoids this tactic, leading to the line f6 exd7+ Qxd7 Qc3.

Moment 2 — Blunder CRITICAL ↗

Trapped Piece

FEN: r3kbQ1/pp2pp1p/4b1p1/3q4/8/8/PPPB1PPP/RN2K2R b KQq - 0 12

You Played: O-O-O
Engine Best: Qxg2
Eval Swing: -996 cp
Variation: Qxg2 Rf1 Bc4 Be3

Refutation: O-O

Coach Explanation

Castling short is suicidal in this position. The engine prefers Qxg2, threatening the rook and bishop. After Qxg2, the best response is Rf1, followed by Bc4, Be3.

Moment 3 — Missed Opportunity CRITICAL ↗

Missed Pin

FEN: 2kr1b2/pp2pp1Q/4b1p1/3q4/8/8/PPPB1PPP/RN2K2R b KQ - 0 13

You Played: Qe5+
You Could Have Played: Qxg2
Eval Swing: -515 cp
Variation: Qxg2 Qh4 Qxh1+ Ke2

You could have played: Qxg2 Qh4 Qxh1+ Ke2

Coach Explanation

You had a chance to unleash a powerful attack with Qxg2! This wins material because the Black Queen is temporarily protected by a pawn. After Qxg2, White is forced to play Qh4 to defend. Then, Qxh1+ forces the king to move to e2. This leaves White in a very difficult position with severe material disadvantage.

Moment 4 — Blunder CRITICAL ↗

Positional

FEN: 2kr1b2/pp2pp1Q/4b1p1/4q3/8/4B3/PPP2PPP/RN2K2R b KQ - 2 14

You Played: Qa5+
Engine Best: Qxb2
Eval Swing: -583 cp
Variation: Qxb2 O-O Qxa1 Bxa7

Refutation: Nc3 Qe5 Qh4 Bg7

Coach Explanation

Queen on a5+ is a mistake because after Nc3, White defends and maintains a strong attack. Qxb2 is superior because after Qxb2 O-O Qxa1 Bxa7, Black wins material and simplifies the position.

Recurring Patterns

This game reinforces a previously identified weakness regarding piece safety and tactical oversight. Missed opportunities to exploit vulnerabilities, specifically related to unprotected pieces, continue to be a problem. Across the analyzed games, tactics involving pins are the most common source of error, however, this game features more vulnerabilities involving hanging pieces. This latest game's mistakes fit the established pattern of overlooking immediate tactical advantages for the opponent and failing to capitalize on available attacks involving undefended pieces.

Annotated PGN

Copy this PGN to paste into Lichess, ChessBase, or any analysis tool.

        
        [Event "Live Chess"]
[Site "Chess.com"]
[Date "2026.03.27"]
[White "AndMatSim"]
[Black "erivera90"]
[Result "1-0"]

1. e4 {+0.40} c5 {+0.32} 2. Bc4 {-0.01} Nc6 {+0.05} 3. Nf3 {+0.04} g6 {+0.46} 4.
d4 {-0.09} cxd4 {+0.21} 5. Nxd4 {+0.16} Nxd4 {+2.04} 6. Qxd4 {+2.12} Nf6 {+2.33}
7. e5 {+1.79} Ng8 {+2.81} 8. e6 {+1.49} d5 $4 {+11.15 Trapped Piece · Bb5+} 9.
Bxd5 {+1.79} Bxe6 {+1.84} 10. Qxh8 {+2.38} Qa5+ {+3.48} 11. Bd2 {+2.22} Qxd5
{+2.52} 12. Qxg8 {-5.92} O-O-O $4 {+3.86 Trapped Piece · O-O} 13. Qxh7 {-5.91}
Qe5+ $6 {-0.81 Missed Pin · best: Qxg2} 14. Be3 {-0.42} Qa5+ $4 {+5.42
Positional · Nc3} 15. c3 {+4.76} Bc4 {+5.54} 16. Nd2 {+5.46} e6 {+7.06} 17. Nxc4
{+7.44} Qc5 {+10.11} 18. Bxc5 {+10.15} Rd3 {+14.15} 19. Qxf7 {+11.12} Bxc5
{+12.17} 20. Qxe6+ {+12.38} Kc7 {+12.71} 21. O-O {+10.75} Rd2 {+12.94} 22. Rfd1
{+13.08} Bxf2+ {#7} 23. Kf1 {#5} Rxd1+ {#4} 24. Rxd1 {#3} Bc5 {#2} 25. Qd7+ {#1}
1-0
    