Another puzzle for an easy Reitstein day
Black to play and win
Reinhart Fuchs v Viktor Korchnoi, Yerevan 1965
Solution
I came across this position in the lovely 1975 book by Raymond Edwards and Raymond Keene 'The Chess Player's Bedside Book'.
This is one of the puzzles in the chapter 'Korchnoi at work', being four difficult puzzles from Viktor's games.
The solution came to me fairly easily, but probably only because of the hint given: ' White apparently has a strong position, but one move wrecks the coordination of his pieces'. With this hint, the solution, 1..Bd3!, is not too hard to see. If 2 Bd3, the now LPDO Rd6 drops off (2…Qd6), and if a rook takes on d3, then the Bc4‘s sight of f1 is blocked, so that 2…Re1+ mates after 3 Qf1 Rf1 mate.
The full game score is below (screenprint from Chessbase's iOS online app).
Posted with Blogsy
allanbeardsworth 
This is not easy at all. I failed to solve it. Was trying to make Rf5 work, I knew the solution has something to do with the weak back rank. Bd3!! what a move!.