It’s Your Move: daily chess puzzle #251

White to play and win

Bures- Zikan, corres 1969

Solution

More or less desperado, but 1 Qc6+! begs to be tried, and in fact wins. 1…bc[] 2 Rb8+ Kd7[] 3 Rb7+

3…Ke8 4 Re7+ and 5 Ne6 mate (because of the Ph7) whilst 3…Kc8 4 Rc7+ 5Nc6+ and 6 Ra7 mate.