18.h4! [White seemingly intends to attack on the kingside but in fact, he is going to block up the kingside, in order to restrict his opponent's counterplay, and then initiate an active operation on the queenside.]
[18.Kb1 Ng8 19.h4 Ne7 20.h5 g5 (20...f5?? 21.hxg6+ Kxg6 22.exf5++–) 21.Nb5 Kg8 22.Rd2 Rd8 23.Rc1 Qb7 24.Qd1 Qb8 25.Rc3 Bf8 26.Ra3 c6 27.dxc6 Nxc6 28.Nf5 Be6 29.Nbxd6 Bxd6 30.Nxd6 Nd4 31.Bxd4 Qxd6 32.Be3 Qc7 33.Rc3±; 18.Rdg1 Qb8 19.Kb1 Ng8 20.h4 Ne7 21.h5 g5±]
18...Ng8 19.h5 g5 20.Kd2!? [After blocking the kingside, White transfers his king there and prepares to launch an attack on the other side.]
20...Ne7 21.Ke1 Ra5 22.Kf2 Qb8 23.Ra1 Qa7 24.Nb5 Qa6? [24...Qb7 25.Kg2 Rfa8 26.Rab1 Qb8 27.Qd2 Kg8 28.Rhc1±]
25.Nxc7 Qc8 26.Nb5 Bxb5 27.cxb5 Qd7 28.Qd2 Rc8 29.Rac1 Ra7 30.Rc4 Ra5 31.Rc2 Ra7 32.Rhc1 a3 33.b4 Na4 34.Rxc8 Nxc8 35.Nf5 Rc7 36.Rc6 Bf8 37.Qc2 Rxc6 38.bxc6 Qa7 39.c7 f6 40.Qc6 1–0
[18.Kb1 Ng8 19.h4 Ne7 20.h5 g5 (20...f5?? 21.hxg6+ Kxg6 22.exf5++–) 21.Nb5 Kg8 22.Rd2 Rd8 23.Rc1 Qb7 24.Qd1 Qb8 25.Rc3 Bf8 26.Ra3 c6 27.dxc6 Nxc6 28.Nf5 Be6 29.Nbxd6 Bxd6 30.Nxd6 Nd4 31.Bxd4 Qxd6 32.Be3 Qc7 33.Rc3±; 18.Rdg1 Qb8 19.Kb1 Ng8 20.h4 Ne7 21.h5 g5±]
18...Ng8 19.h5 g5 20.Kd2!? [After blocking the kingside, White transfers his king there and prepares to launch an attack on the other side.]
20...Ne7 21.Ke1 Ra5 22.Kf2 Qb8 23.Ra1 Qa7 24.Nb5 Qa6? [24...Qb7 25.Kg2 Rfa8 26.Rab1 Qb8 27.Qd2 Kg8 28.Rhc1±]
25.Nxc7 Qc8 26.Nb5 Bxb5 27.cxb5 Qd7 28.Qd2 Rc8 29.Rac1 Ra7 30.Rc4 Ra5 31.Rc2 Ra7 32.Rhc1 a3 33.b4 Na4 34.Rxc8 Nxc8 35.Nf5 Rc7 36.Rc6 Bf8 37.Qc2 Rxc6 38.bxc6 Qa7 39.c7 f6 40.Qc6 1–0