On a game field consisting of 25 checks and two partitions, there are 20 chess pieces: 10 chess pieces of one colour and 10 chess pieces of the other colour.
For one move it is possible to move any chess piece on any free check using free checks.
How many movies least should be made to change the places of chess pieces of different colours?
For one move it is possible to move any chess piece on any free check using free checks.
How many movies least should be made to change the places of chess pieces of different colours?
