White to move. How should White proceed?
Van den Berg, Carel Benjamin – Eliskases, Erich Gottlieb (Beverwijk, 1959)
2r5/pp2kp2/5p1Q/3Pp3/1q4b1/1B6/P1P3PP/1K5R w – – 0 25
Chess Daily News from Susan Polgar
Thursday night chess tactic
1. Rf1! Qd6
2. Qh4! Bd7
3. Rf6 Qf6
4. d6+ Black resigns.
This might have been a better problem one move later in the game: 25.Rf1 Qd6. Now, as Dopa points out, White wins with 26.Qh4.
Van den Berg missed that, and actually went on to lose the game after some additional later sloppiness.