White to move. How should white proceed?
Solution :
1. Qh7!! f1=Q? 2. Qg8+ Qf8 3. Bxf7+ Ke74. Rxb7 Kf6 (Rc7 Rxc7 Kf6)5. Qg6#
1. 1. Qh7 Qxe62. Qxh8+ Ke73. Rxb7+ Qd7 (Rc7 Rxc7+ Qd7)4. Qe5+ Kd8 (Kf8 Rxd7 any Qh8#)5. Rxd7+ Kxd76. Qd6+ Ke87. Ne5 Rd8 (f1=Q+ Qd7+ Kf8 Qxf7#. f1=1N+ Ke1 Rd8 .8. Qf6 Rd7 9. Qh8#
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