(related to Problem: The Chinese Chessboard)
Eighteen is the maximum number of pieces. I give two solutions. The numbered diagram is so cut that the eighteenth piece has the largest area — eight squares — that is possible under the conditions. The second diagram was prepared under the added condition that no piece should contain more than five squares.
No. $74$ in the Canterbury Puzzles shows how to cut the board into twelve pieces, all different, each containing five squares, with one square piece of four squares.
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