On the passive 20.Rd1, Black continues to play on the dark squares with the move 20...Kf8! – the king goes to a safer square and defends the Re8, which is necessary for the threat of ...Nc6-b4.
This nice exchanging operation ensures Black a decisive advantage in the endgame.
23.gxf3 Bxf2+ 24.Kxf2 Rxb5 25.Be4 Rxb2+ 26.Kg3 Bb7 27.Nc3 Ne7 28.Rb1 Rxb1 29.Bxb1 Kg7 30.Nb5 c5 31.Nd6 Bc6 32.f4 gxf4+ 33.Kxf4 33...Ng6+ 34.Kf5 Bd7+ 35.Ke4 Bxh3 36.Kd5 Be6+ 37.Kxc5 Nxe5 38.Kd4 Nd7 39.Ke4 Kf6 40.Kf4 Nf8 41.Ne4+ Ke7 42.Ng3 Ng6+ 43.Kf3 Kf6 44.Ne4+ Ke5 45.Ng3 f5 0-1
After this counterblow, the white pawns fall one after another.
Of course, the simple retreat 35...Bh6 was also possible, but in this case, White gets a tempo to activate his pieces, and after 36.Nb4 Rc3 37.Ra1 Rxc4 38.Nc6, his rook comes to a7, gaining some chances of saving the game.
Of course, the simple retreat 35...Bh6 was also possible, but in this case, White gets a tempo to activate his pieces, and after 36.Nb4 Rc3 37.Ra1 Rxc4 38.Nc6, his rook comes to a7, gaining some chances of saving the game.
36...Rxc4 37.Nc6 Bc1 38.Kf1 Kf6 39.Rd3 Rc5 40.Na7 e4 41.Rd1 Bh6 42.Ke1 Kf5 0-1
On 1...Ne6?, White wins by 2.Rc2! (2.Ne7+ Kh8 3.Rc2 e4 4.Rh2 Qh5∞) 2...Qxa3 3.Ne7+ Qxe7 4.Rh2!.
If the queen is taken, White is killed by the presence of the pawn on f3, which prevents the rook being brought to the kingside with tempo.
After 2...gxh5 3.Rg1+ Kh8 4.Nh6, the threat of Rg8, followed by Nf7 mate is unstoppable.
After 2...gxh5 3.Rg1+ Kh8 4.Nh6, the threat of Rg8, followed by Nf7 mate is unstoppable.
But not 5...Qh5+?? 6.Qxh5 gxh5 7.Nh6+ Kh8 8.Rg1, and again Black has no defence against mate. 8...Rad8 9.Rg8+ Rxg8 10.Nxf7#.