Before revision: We give a computer-based proof of the following fact: If a square is tiled by seven convex tiles which are congruent among themselves, then the tiles are rectangles . This confirms a new case of a conjecture posed by Yuen, Zamfirescu and Zamfirescu .
After revision: We give a computer-based proof of the following fact: If a square is tiled by seven convex tiles which are congruent among themselves, then the tiles are rectangles .