Henry Dudeney, a self-taught English mathematician and puzzle columnist, asked his readers to dissect an equilateral triangle into the smallest number of pieces that could be rearranged into a square.

While solving the puzzle, the experts found out that a two-piece solution was not possible due to the problem’s constraints. To begin with, the triangle and square must have the same area since ...

A puzzle fan was left devastated after completing the world's biggest jigsaw only to discover four of its 33,600 pieces were missing. Jeremy Baker-Deam, from the Isle of Wight, said it was a huge ...