After 3.Nb5 exd4 Black is better, but the text practically loses a pawn.

Now White is unable to sustain all the exposed pawns on the fourth rank.

Black is winning.

Supported by a tactical variation, White improves his rook and now threatens 2 Rd6.

Or 2...f5 3.Re1 and the passed pawn decides – Smagin.

The point. Black has no defence against the attack along the b1-h7 diagonal.

Black resigned.

Withdrawing the queen from the exposed d4-square before taking actions on the kingside.

1...e5?! 2.f5! White takes over on the kingside.