Studer, N. – Kamsky, G.

2581 2021 · Black wins (resignation, time or agreement)

Studer (2581) against Kamsky (2658), 2021: a Leningrad Dutch in which Black settles with 6...O-O and 7...c6 before sharpening play with 9...Ne4. Captures pile up in the centre and the game stays balanced right through move 32. The break point is 33.Rf1: the evaluation swings from 0.0 to +1.6 in Black’s favour, and the balance is gone in one move. Kamsky follows with 33...Rbf8 and 34...Bxd6 and never lets go — 100% at-least-good moves for Black against 89% for White. The takeaway: in an equal but loaded position, one passive rook move can hand over everything.