White's winning move
20. Nc6!
This move cuts communication between the black queen and rook.
20...Nb6
A better move was 19...Bxd4 which would be followed by 20.cxd4 Qc7 21. h3 (to
stop back rank mates) 21...Kd8 22.Rfc1 Qxc1+ 23.Rxc1 Rxc1+ 24.Kh2 Rc8 25.Qxa5
Ke8 Qxb4 and white is two pawns up with black's forces poorly co-ordinated because
the rooks don't defend each other. This is a winning advantage in master-level
play.
21.Qb7 1-0
Black resigned because he must lose the black rook to defend the mate on
e7
Written 4 May 2009