## THE FOUR FROGS.

(

The Guarded Chessboard)

In the illustration we have eight toadstools, with white frogs on 1 and

3 and black frogs on 6 and 8. The puzzle is to move one frog at a time,

in any order, along one of the straight lines from toadstool to

toadstool, until they have exchanged places, the white frogs being left

on 6 and 8 and the black ones on 1 and 3. If you use four counters on a

simple diagram, you will find this quite easy, but it is a little more

puzzling to do it in only seven plays, any number of successive moves by

one frog counting as one play. Of course, more than one frog cannot be

on a toadstool at the same time.

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THE MANDARIN'S PUZZLE.
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THE CUBIC KNIGHT'S TOUR.