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Qe8 Bd6 36. h6, and the passed pawn will soon cost Seirawan even more material.

In the end, White’s passed pawn is too slow and Black’s passed pawn is too far: 42. bxa5 Kd7 43. a6 Kc6, and Sebag resigned as her pawn is stopped and her king is too far away to catch the soon-to-queen Black f-pawn.

White gets very little out of the opening play in this Ruy Lopez Berlin Defense line, but benefits from the tiniest of assists from his opponent on 21. f4 f5?! — this looks like a case of grandmasterly overthinking, giving White a protected passed pawn that must be eternally watched.

Ra1 Kd3, and the passed pawn will cost White his rook; Tal resigned.

Qd6, as now both players have mating and perpetual check threats and Black has a very dangerous passed pawn which must be managed.