Henry Ernest Dudeney/Puzzles and Curious Problems/252 - Black and White
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Puzzles and Curious Problems by Henry Ernest Dudeney: $252$
- Black and White
- Place four light and four dark counters alternately in a row as here shown.
- 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?
Click here for solution
Sources
- 1932: Henry Ernest Dudeney: Puzzles and Curious Problems ... (previous) ... (next): Moving Counter Problems: $252$. -- Black and White
- 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Geometrical Problems: Moving Counter Puzzles: $377$. Black and White