It’s Your Move: daily chess puzzle # 150

White to play and win

Roth v Durao, Hague 1966

Solution

In the game, White played the natural 1 a3 and after 1..Qb6 the game went on. But 1 Na4! wins the queen: for instance 1…b5 2 a3! Qa4[] 3 b3 is an unusual entrapment.