Monochromatic. No piece has ever moved from a white square to a black square and vice versa. The white King has never moved. Where is the doubtful white Pawn? g4, h4, g5 or h5?

Solution: If the white K has never moved, what piece could have captured the last black piece from black square? The doubtful Pawn! Then it's on h4 or g5 and has one capture at least.

What piece could have captured the missing Nb8? Only a promoting Pawn from f2 or h2! For example: 1 f2-f4 (or 1 h2-h4); 2 xQg5; 3 xh6e.p.; 4 xg7; 5 xRh8=Q... xNb8 (4 captures on black squares. The e.p. was in the white square). This white piece was captured by the black B to late. This one was captured by the doubtful Pawn. The black band has six missing pieces from black squares. The black Pawn from a7 was not captured by a white Pawn. Then the doubtful Pawn has only one capture and stays on g5.

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