3rd Prize, Weenink MT, 1932 (correction by Bernhard Schauer)
Mate in 3
A three-mover which features a striking theme.
1.Qh1 carries three threats, 2.Qxa8, 2.Rc6+ and 2.Qc6+. Black defends by capturing the queen, and each capture takes the capturing piece across a critical square, allowing a shut-off which prevents the piece from returning along the line to guard a mating square. 1...Rxh1 2.Bf1 threat 3.Sb5; 2...Rxe7+ 3.Rxe7; 2…Bc6+ 3.Rxc6 and 1...Bxh1 2.Re4 threat 3.Se6; 2...Rxe7+ 3.Rxe7.
Dafydd Johnston: Black has adequate defences to the threats from the vacations on b5 and e6, so one or other of the defending pieces must first be decoyed over a critical square so that it can be shut off by the vacating move. A fine logical problem.