Wang Chen – Yu Yangyi

2500 2015 · Black wins (resignation, time or agreement)

Wang Chen (2500) against Yu Yangyi (2724), 2015: a Grünfeld by transposition, White opening with 1.Nf3 and e3 before committing to d4. The engine flags no turning point — neither side plays the single move that flips the game. Accuracy is close, 91% for White and 89% for Black, yet the result is decisive for Black (0-1). After 15.Qxa7 the white queen goes pawn-hunting while Black builds central pressure with e6, Qd5, then Nd4 and Ne4. The lesson: a game can be lost without one identifiable blunder, through an accumulation of positional concessions the evaluation absorbs bit by bit rather than in a single jolt.