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A textbook example of the Dresden theme, which will be explained with the solution.
There are three tries:
1.Bb6?A threat 2.Qd4+ Ke6 3.Bd7,Sg7, but 1...Bc3!a
1.B×b5?B threat 2.Qc4 mate, but 1...Rc3!b
1.g×f3?C threats 2.Qe4+ and 2.B×b5, but 1...Sc3!c
The key is 1.Sg7 threatening 2.Sf5 and 3.S×e7 (if 2...Ke6 3.S×e3)
1...Bc3 a 2.B×b5 B threat 3.Qc4, and if 2...Bd4 3.Q×f3 1...Rc3 b 2.g×f3 C threat 3.Qe4, and if 2...Rc4 3.Qd7 1...Sc3 c 2.Bb6 A threat 3.Qd4, and if 2...Se4 3.Qe6, or 2...K×e5 3.Qd4,Qf5
The remaining defence leads to a switchback 1...e6 2.Sh5 and 3.Sf6
In the Dresden theme a good defence which refutes a try threat is replaced by a bad defence by a different piece in the post-key play. In each of the thematic lines of Loshinsky's problem the good defence is eliminated by an obstruction on c3, while the bad defence is a selfblock.
Dafydd Johnston: The key with its quiet threat is difficult to spot, but after focusing on the obvious self-interference of the black pieces on c3 it becomes apparent that white's responses all require control of e6. And being forewarned of the theme helps too!
Jacob Hoover: The nice cyclic theme of this problem made it a very rewarding solve.
Any comments or questions on this problem should be addressed to
Michael McDowell using the ‘Contact’ item in the menu on the left.