Henry Ernest Dudeney/Puzzles and Curious Problems/252 - Black and White

by : $252$

 * Black and White
 * Place four light and four dark counters alternately in a row as here shown.


 * Dudeney-Puzzles-and-Curious-Problems-252.png


 * The puzzle is to transfer two contiguous counters to one end and then move two contiguous counters to the vacant space,
 * and so on until in four such moves they form a continuous line of four dark counters followed by four light ones.


 * Then try this variant.
 * The conditions are exactly the same, only in moving a contiguous pair you must make them change sides.
 * How many moves do you now require?