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A fine task problem, repeating its idea in six variations.
The solution will appear here on Friday 24th June.
In the Valve theme, a black defender simultaneously opens the line of a queen, rook or bishop and closes a second line of the same piece. In a three-mover the line closure may be anticipatory. 1.Rg7 threatens 2.Rf7+ Kg6 3.Sxf4, and all six moves of the d2 knight allow White to exploit an interference on a queen line. 1…Sb1 2.Ka7 any 3.Qd8 (2…Qa1+?) 1…Sb3 2.Sxc7 threats 3.Se8 and 3.Sd5 (2…Qxb2+?) 1…Sc4 2.Kxc7 any 3.Qd8 (2…Qxc2+?) 1…Se4 2.e7 any 3.e8S (2…Qe1? 2...Qe3?) 1…Sdf3 2.Kb7 any 3.Qd8 (2…Qh1+?) 1…Sdf1 2.Be8 any 3.Rg6 (2…Qg1?)
Dafydd Johnston: It's amazing that the need to open the black queen's line to f4 can lead to so many line closures by the knight, all answered by different mates. Marvellous use of the whole board.
Jacob Hoover: Lev Loshinski was truly the master of the three-mover, and problems like this one make it easy to see why.
Any comments or questions on this problem should be addressed to
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