An endgame study from 1979 by Mario Matous.
White to move and win.
Solution:
1.Kf2!
White has only draw after 1.Qxf1+? Kh2 (2.Qf2+ Bg2 3.Qh4+ Kg1 4.Qf2+ Kh2 5.Qf4+ Kg1).
Black has the advantage after 1.Qh4+? Nh2.
And don't fall for 1.Kxf1?? La6.
1...Bg2
A better try for black than 1...Nh2 2.Bf3+ and 1...Qa6 2.Bf3+! with both more easy winning for white.
2.Bf3 Qg7 3.Qh4+!
Black has draw after 3.Qxf1+ Kh2 4.Qg1+ Kh3 5.Bxg2+ Kh4 6.Qh2+ Kg5.
3...Nh2 4.Qh8!!
Stops black from playing 4...Qb2+. And 4...Qxh8?? 5.Bxg2+ is mate.
4...Qg6 5.Qh7! Qg5 6.Qh6! Qg8
The black Queen is forced to g8, where it soon will be captured by the white queen.
7.Qc1+ Nf1 8.Qxf1+ Kh2 9.Qg1+ Kh3 10.Bxg2+ Kh4 11.Qh2+ Kg5 12.Qg3+ followed by Qxg8 winning the black queen.
