A very complex chess puzzle which is known as “Plaskett’s Puzzle”.
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This position in Forsyth-Edwards Notation (FEN) is : 8/3P3k/n2K3p/2p3n1/1b4N1/2p1p1P1/8/3B4 w – – 0 1
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Video Thumbnail Attribution: By MBIHund [CC BY 3.0 ()], from Wikimedia Commons