|This is another way of presenting sliding block puzzles which is only really possible where all the pieces to be moved are the same shape and size.
The board can easily be drawn (each cell is a square) and the pieces can be counters or coins. The usual rules apply. There is no passing or jumping, and only one piece at a time may be in any cell of the board.
Now all you have to do is -
Exchange the positions of the RED and BLUE counters.
|This puzzle was invented by Henry Dudeney, the great English puzzlist, in about 1910.
It has been produced several times since then in various forms - often involving parking cars or space craft.
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