Dissection of a chess board into 4 congruent pieces

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Consider a standard $8\times 8$ chessboard where a pawn is placed on each of the squares $d1,d2,d3,d4$ . Dissect the board into $4$ congruent pieces (reflections are allowed) such that each piece contains exactly one pawn.

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I think growing spirals from each corner simultaneously does the trick.

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