Fairy chess composition
 No.1520 Chris Feather (England) Original Fairy problems JF-2020/I: January – June’2020

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 No.1520 Chris Feather England original – 30.06.2020 Solution: (click to show/hide) white Bf8 Sd8a7 Ka1 Pa3 black Ke8 ser-h#25                                     (5+1) Circe Equipollents 1.Ke8-d7 2.Kd7-c7 3.Kc7-b8 4.Kb8-a8 5.Ka8*a7[+wSa6] 6.Ka7*a6[+wSa5] 7.Ka6-b6 { } 8.Kb6-c7 9.Kc7-d7 10.Kd7-e8 11.Ke8*d8[+wSc8] 12.Kd8-e8 13.Ke8*f8[+wBg8] 14.Kf8-g7 { } 15.Kg7-f6 16.Kf6-e5 17.Ke5-d4 18.Kd4-c5 19.Kc5-b5 20.Kb5-a4 21.Ka4*a5[+wSa6] 22.Ka5-b5 { } 23.Kb5-c6 24.Kc6-b7 25.Kb7-a8 Bg8-d5 # { (C+ by Popeye 4.83)} Inspired by Hans Peter Rehm's remarkable book on logic in fairy chess (Logik & Zweckreinheit im Märchenscach, Fee=Nix 2017) I have tried to compose serieshelpmates with a strong logical element, although of course they cannot exactly meet the criteria of the German logical school of composition. Thus in the present problem the final position is obvious but in order to find (or simply to understand) the solution, it is necessary to see why the Sa7 must be moved to a5 and why it is too soon to start with a capture on d8 or f8. (Author)

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