CHESSTTCAMPS:
White has a bishop for a knight, an outside passed pawn, and an
attacking focus on f7. Black also has very active pieces except for Rf8.30.Rxf7!! goes directly for the target,
with the primary threat of 31.Rf5+ Kh8 32.Rxf8#. White can deal with
each of black's counters:A) 30... Rxf7? 31.Ra8+ forces mate.
B) 30... Qxd5? 31.Rxf8+ Kxf8 32.Qf1+ (protecting back rank;
of course not 32.exd5?? Rc1+) Qf7 (otherwise 33.exd5 wins) 33.Ra8+ Ke7
34.Ra7+ Ke8 35.Rxf7 wins.
C) 30... Rc1+ 31.Qf1!! (A brilliant
resource! 31.Rf1+?? Kh8! 32.Ra8 [Re1 Rxe1+ 33.Qxe1 Qf4! 33.g3 Qf3+
34.Kg1 Nf2! wins] Rxa8 33.Bxa8 Qf4! wins for black) Rxf1+ 32.Rxf1+ Qxd5
33.Rxf8+ Kxf8 34.exe5 with a won endgame (R+P for a N)
C.1) 31... g6 (or h6) 32.Qxc1! Qxc1 33.Rc1+ K-moves 34.Rxc1 wins a rook.
C.2) 31... Qf6 32.Rxf6+ forces mate,
C.3) 31... Nf6 33.Rxf6+ Rf7 (Qxd5 34.Rxf8#) 34.Ra8+ Rc8 35.Rxc8#
C.4) 31... other 32.Rxf8#
D) 30... Nf6 31.Rxf6+ Qxd5 32.Rxf8+ (exd5?? Rc1+) Kxf8 33.Qf1+ Qf7 34.Ra8+ wins as in B.
E)
30... g6 31.Qf1! (Rf5+? Kg7 32.Ra7+ Kh6 and the back rank problem again
burns white) Rfc8 32.Rf5+ Kg7/h8 33.Rxg5 Rc1 34.Kg1 Ne3 35.Qxc1 Rxc1+
36.Kf2 leaves white a rook ahead.
E.1) 31... Rxf7 32.Qxf7+ Kh8 33.Qg8#
F) 30... h6 31.Qf1! (Rc7+? Qxd5! 32.exd5 [Rxc3 Qe5] Rxc7)
Rxf7 32.Qxf7+ Kh7 33.Qg8+ Kg6 34.Qe8+ Kh7 (Kf6 35.Qe6#) 35.Bg8+ Kh8
36.Bf7+ Kh7 37.Qg8#
) 32.Re1 looks like the ball is in black's court.
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