[Event "Beverwijk, 1964"] [White "Jan-Heim Donner"] [Black "Arthur Dunkelblum"] [FEN "2rqrb2/p2nk3/bp2pnQp/4B1p1/3P4/P1N5/1P3PPP/1B1RR1K1 w - - 1 0"] %Hidden=1 1. Nd5+ exd5 2. Bxf6+ Kd6 3. Be5+ Ke7 4. Bd6#