It’s Your Move: daily chess puzzle #246

White to play and win after Black plays …Bd5 in the diagram position

Suttles v Ostojic, Belgrade 1969

Solution

Examine all biffs, leads to (after first looking at and rejecting 1 Rd7) 1 Qf6+ which is a version of Purdy’s potassium cyanide.

Black is forced to capture (if 1…Kf8 defending the queen, 2 Qh8 mate) when after the exchanges White emerges a piece for a pawn up.