Introduction A Various 1 Solutions 6 B Practical Geometry 13 Solutions 17 C Chess Pieces 27 Solutions 31 D Square Routes 37 Solutions 41 E Shapes and Shapes 45 Solutions 53 F Games 67 Solutions 69 G Cubes and Bricks 77 Solutions 80 H How Many? 85 Solutions 90 I Ominos and Other Animals 99 Solutions 103 J Diophantine 111 Solutions 114 K Arranging Numbers 123 Solutions 128 L More Various 137 Solutions 141