__agb2002__: The material is identical.

Black threatens Nxe2+ and Nxc2.

The only practical option I can see is 26.Qh5:

A) 26... Nxc2 27.Nxg5

A.1) 27... Nxe1 28.Qxh7+ Kf6 (28... Kf8 29.Qf7#) 29.Ne4#.

A.2) 27... h6 28.Qf7+ Kh8 29.Qh7#.

A.3) 27... Q(R)e7 28.Qxh7+ Kf8 (28... Kf6 29.Ne4#) 29.Qh8#.

A.4) 27... Qxg5 28.Qxg5+ Kh8 (28... Kf7(8) 29.Rf1+ and mate next) 29.Qf6+ Kg8 30.d6+ B(R)e6 31.Bxe6+ R(B)xe6 32.Qxe6+ wins.

A.5) 27... Qf6 28.Qxh7+ Kf8 29.Rf1 wins (29... Qxf1+ 30.Kxf1 Re7 31.Qh8#).

A.6) 27... Bf5 28.Rf1 (28.Qf7+ Kh6 29.Qxf5 Qxg5)

A.6.a) 28... Ne3 29.Rxf5 wins (29... Nxf5 30.Qxh7+ and mate next).

A.6.b) 28... Bg6 29.Rf7+

A.6.b.i) 29... Bxf7 30.Qxh7+ Kf6 31.Ne4+ Ke7 32.d6+ Qxd6 (32... cxd6 33.Qxf7#) 33.Qxf7+ Kd8 34.Nxd6 cxd6 35.Qd7#.

A.6.b.ii) 29... Kg8 30.Qh6 wins (30... Rxf7 31.Qxh7+ Kf8 32.Qxf7#).

A.6.b.iii) 29... Kh8 30.Rxh7+ and mate in two.

A.6.c) 28... Qf6 29.Qxe8 Qxg6 30.d6 cxd6 31.Qf7+ Kh6 (31... Kh8 32.Qf8+ Qg8 33.Qxg8#) 32.Rxf5 Qc1+ (32... Qg6 33.Rf6 wins) 33.Bf1 looks winning.

B) 26... h6 27.Rf2

B.1) 27... Bf5 28.Rxf5 Nxf5 29.d6

B.1.a) 29... Nxd6 30.Nxd6 cxd6 (30... Qxd6 31.Qf7+ Kh8 32.Qxe8+ and mate in two) 31.Bf7

B.1.a.i) 31... Re7 32.Qg6+ and mate next.

B.1.a.ii) 31... Rf8 32.Qg6+ and mate next.

B.1.a.iii) 31... Rg8 32.Qg6+ Kf8 (32... Kh8 33.Qxh6#) 33.Qxg8+ wins decisive material.

B.1.a.iv) 31... Rh8 32.Qg6+ Kf8 33.Rf1 with the threat Bg8+ and Rf7+ or Qg7+ looks winning.

B.1.b) 29... cxd6 30.Qf7+ Kh8 31.Qxf5

B.1.b.i) 31... d5 32.Nf6 Re7 33.Nxd5 + - [B+N vs R] and an overwhelming position (33... Rxd5 34.Bxd5 Qxd5 35.Qf8+ and 36.Qxe7).

B.1.b.ii) 31... Rf8 32.Qg6 Qe7 33.Qxh6+ and mate in two.

B.1.b.iii) 31... Ra7 32.Qg6 Rh7 33.Nf6 Ree7 34.Bg8 wins. For example, 34... Reg7 35.Bxh7 Rxg6 36.Bxg6 Kg7 (36... Qxf6 37.c7 Qe6 38.Rc1 Qc8 39.Bf5 wins) 37.c7 Qc8 (37... Qxc7 38.Ne8+ Kxg6 39.Nxc7 wins) 38.Rc1 Kxg6 (38... Kxf6 39.Bd3 followed by Ba6 wins) 38.Nd5 Kf7 39.Nxb6 wins.

B.2) 27... Nf5 28.g4 Nd6 29.Nxd6 wins.

B.3) 27... Rf8 28.Rxf8 Qxf8 (28... Kxf8 29.Rf1+ B(N)f5 -else 30.Qf7+ wins- 30.g4 wins a piece) 29.Rf1 followed by d6 looks winning. For example, 29... Qg8 30.Rf6, or 29... Qe7 30.d6, or 29... Bf5 30.g4 Bg6 31.Qxg6+ Kxg6 32.Rxf8, etc.

C) 26... Bg4 27.Qxg4 Nxc2 28.Nxg5

C.1) 28... Ne3 29.Ne6+ Kh6 (else 30.Qg7#) 30.Qg7+ Kh5 31.Be2+ Kh4 32.Qg4#.

C.2) 28... Kh6(8) 29.Nf7#.