1.Qc5+!

thematic try:

1.Qc7+? Kxa8 2.h8Q Qxh8+ 3.Kxh8 Sgf6! zz

4.Qb6 d5! zz

5.Qc7 d4 6.Qb6 d3 7.Qa6+

(7.Qc7 d2 8.Qd6 Kb7!=)

7...Kb8 8.Qxd3 Kc7!

(8...Kc8? 9.Qd6! Kb7 10.Qc5!+-)

9.Qd4 Kc6 10.Qe5

(10.Qd8 Kc5!=)

10...Kd7!=

(10...Kb6? 11.Qc3!+-)

[1.h8Q? Qd8+/Qe6+/Qg6+=;

1.Qa3+? Kb6!=]

1...Kxa8

[1...Ka6 2.Qc8++-]

2.h8Q Qxh8+

[2...Qd8+ 3.Qf8! Qxf8+ 4.Kxf8+-]

3.Kxh8 Sgf6 4.Qc7! zz

[4.Qb6? d5!= zz]

4...d5 5.Qb6! zz

5...d4 6.Qxd4+-

e.g. 6...Kb8 7.Qc4 Kb7 8.Qc5 Ka6

9.Qb4 Ka7 10.Qb5 Ka8 11.Qb6 zugzwang