24.Bg3 Qe6 25.Nf5 Bf8 26.Qc3 f6 27.f4 Ng6 28.Nxh6!+ Bxh6 29.f5 Qe7 30.fxg6 Bf8 31.Qc4+ Kg7 32.Bxd6!
Unity Chess Club
Alexander Alekhine Emanuel Lasker New York 1924 (3) Black to move
The d4-pawn is isolated and needs defending. Black exploits this:
The weakening of a whole group of dark squares, which this move forces, is very significant, especially in view of White’s lack of a dark-squared bishop.
An attempt to cover the square f4 against an entry by the black queen. But the knight is badly placed here, because it does not perform any other functions. White’s problems are growing.
Including yet another piece in the attack on the dark squares, decides the game.
29...fxe5 30.Qxg5 e4 31.f6 g6 32.f4 hxg4 33.Be2 gxh3 34.Bh5 Rb2 35.Nh4 Qxf4 36.Qxf4 Bxf4
Unity Chess Club
Paul Keres Vasily Smyslov Bled/Zagreb/Belgrade 1959 Black to move
There is a lack of coordination among the white pieces. Exploiting this, Black creates an object of attack on the queenside:
He should not allow Black to open lines for his rooks; instead, he should prefer 20.bxa5 bxa5 21.Nd4, with chances of equalising.