Line of pawns

8 black pawns and 8 white pawns, alterning on a line.
Group all the black pawns and all the white pawns by
 - moving two touching pawns at a time, without reversing,
 - set them in contact with at least another pawn.

How many moves are required ?
You may begin with just 4 black pawns and 4 white pawns...

dynamic page allowing to move the pawns by yourself



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