Mamedyarov, S. – So, W.

2767 2019 · Black wins (resignation, time or agreement)

Mamedyarov (2767) versus So (2767), 2019: an Alekhine Defense where White strikes early with 5.Bxf7+ Kxf7, leaving the black king uncastled for the whole game. The turning point is a queen move: 20.Qg4 is flagged as a mistake, yet it swings the evaluation from −0.5 to +1.0. What follows is a run of missed chances on both sides — 22.f4 (+1.2 to +4.5), 22...Qg6 (−4.5 to −2.2), then 25.Kf2 (+3.1 to +7.1) — a sign the position had grown too sharp for either player to hold. Black, at 75% good-or-better moves against 57%, converted after 26...Rxg3. The lesson: here, every queen move decides the game.