The Six Square Puzzle
Place twelve counters on a piece of slate or cardboard, so that they would be at the angles of six squares, as shown in M, in the accompanying diagram (Fig. 14). The puzzle then is to take away three counters, so that the remaining nine counters shall describe three squares only. The solution is shown in N, Fig. 14. The twelve counters form the six squares A, B, C, D, E, F, whereas upon the counters 1, 2, and 12 being removed the squares C, D, and E only are left.