A Fairy Chess Problem With Countless Bishops

Fairy chess is the area of chess composition in which there are some changes to the rules of chess. The term was introduced by Henry Tate in 1914.
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The puzzle in Forsyth-Edwards Notation (FEN):
KB1B1Bk1/B1B1B1B1/1B1B1B1B/B1B1B1B1/1B1B1B1B/B1B1B1B1/1B1B1B1B/B1B1B1R1/ w – – 0 1
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