Here’s a puzzle by Martin Garnder [1].
Can a queen, king, rook, bishop, and knight be placed on a 4² board so no piece attacks another?
There are two solutions, plus symmetries.
Note that in all non-attacking chess puzzles, the colors of the pieces are irrelevant. In the solutions I chose the piece colors to be the opposite of the square colors strictly for aesthetic reasons.
More chess posts
More Martin Gardner posts
- Magic square filled with consecutive primes
- Finding π in the alphabet
- Martin Gardner’s April Fool’s joke
[1] Martin Gardner. Some New Results on Nonattacking Chess Tasks. Math Horizons. February 2001, pp 10–12.
The second solution was missing a piece. This has been fixed, but some people will not see the fix for a while due to a caching issue.