johnlspouge: Sunday (Insane):
O Garcia vs J M Bellon Lopez, 2001 (28.?)
White to play and win.
Material: Even. The Black Kf7 has 4 legal moves. White has an advanced passed Pd6 backed by Rd1. The White Re4 is on a semi-open file and a semi-open rank. The White Qb2, Re4, and Nf3 attack Pe5, which is protected by Qa5 and Pf6. Because the Black Qa5 and Rb8 are distant, a sacrificial attack against Pe5 might be based on local superiority around the Black K-position. The Black Kf7 would then be open, and all Black pieces except Ne6 are loose and susceptible to Q forks. The Black Qa5 is somewhat cramped, with only 3 flight squares. The White Kg1 is secure from checks.
Candidates (28.): Nxe5+, Ng5+, Rxe5
The N is better left standing at e5 than the R, because White then has a strong initiative against the open Black K.
28.Rxe5 fxe5 [else, drop a P]
29.Nxe5+ Ke8 [else, drop 2Ps after 30.Nxd7]
<[I went for 30.Nxd7, which Toga evaluates at about +2.0 Ps, not as good as the game variation 30.Nc6, but still winning.]>
30.Nxd7 Kxd7 31.Qf6 (threatening 32.Qe7+ 33.Qxe6)
Because counterattack is infeasible, Black must reinforce or move Ne6 (feasibly, only to d8 or c5).
(1) 31…Re8 32.Qf7+ Kd8 33.d7 (threatening 34.dxe8=Q# and 35.Qxe6)
33…Re7 34.Qg8+ Kc7 35.Qxe6 (threatening 36.d8=Q+ 37.Qxa5)
Black is down at least a Q.
(2) 31…Nd8 32.Qe7+ Kc6 [Kc8 33.Rc1+] 33.Rc1+ Kd4 34.Qc7
34…Qb6 [else, drop material] 35.Rd1+
35…K to e-file 36.Qe7+ Ne6 [Kf5 37.Rd5#] [Kf3 37.Rd3+ Qe3 38.Rxe3#]
37.Re1+ and Black is down 2P after 38.Qxe6
<[Toga gives the next variation as best play after 30.Nxd7, up to 34.Qd6+, when it prefers 34.Nd6+.]>
(3) 31…Nc5 32.Qe7+ Kc6 [Kc8 33.d7+] 33.d7 Rd8 34.Qd6+ Kb7 35.Rd5
White has won a P.
(4) 31…Qf5 32.Qe7+ Kc6 [Kc8 33.d7+ then 34.d8=Q+]
33.d7 (threatening 34.Rd6+ Kc5 [Kb7 or Kc7 35.d8=Q+] 35.Rxe6+)
(4.1) 33…Nd8 34.Qd6+ Kb7 35.Rc1 (threatening 36.Rc7+ 37.Qxa6#)
35…Ka7 36.Qc7+ Nb7 [Rb7 37.Qxd8] 37.a5 (threatening 38.Qb6+ 39.Qxa6#]
There is no antidote.
(4.2) 33…Qe5 34.d8=Q Rxd8 35.Rxd8 Qa1+ 36.Kh2 Nxd8 37.Qxd8
White wins a P and is likely to win against the open Black K and the remaining weak Ps.