1.Qa3!	g6
If [A] 1... Qxa3 2.Rd8+ Ke7 3.Re8#, or [B] 1... f6 2.Rd8+ Kf7 3.Be8+ Kf8 4.Bg6#
2.Rd8+
And Black resigned: if 2... Kg7 3.Rxg8+
Euwe-Benites (1948)