Back to yesterday's question.
Reshevsky-Fischer, Palma de Majorca Interzonal, 1970
Black to move
In this position, you may have been tempted to play 28...Qe2?? It does threaten a back-rank mate in one move: 29...Qxf1#. But White gets to go first: 29.Qxf7+! Kh8 leads to this position:
Analysis after 28...Qe2??: White to play and win
So what's the winning move?
28...Qe1?? is bad for a slightly different reason: do you see why?
Analysis after 28...Qe1??: White to play and win
Of course, Fischer was not naïve in matters on the chessboard. He found the best move: 28...Qf4!
a critical position!
Switch sides for a minute and try to help Reshevsky save this position with White (hint: a grandmaster playing White would have real drawing chances against Fischer): what would you recommend? The most important challenge is to avoid getting mated on the back rank!