| W | B | ||
| B | W | ||
| W | B | ||
| B | W |
Place four white and four black chess knights on a 4x4 board as shown. Using standard knight moves, swap the positions (black for white.) Moves do not need to alternate in color, and at no time may a knight be under attack from the opposite color.
For ease of comparing solutions, use this labeling of the board for declaring moves. +--+--+--+--+ | A| B| C| D| +--+--+--+--+ | E| F| G| H| +--+--+--+--+ | I| J| K| L| +--+--+--+--+ | M| N| O| P| +--+--+--+--+Warmup: Try the puzzle with only the corner knights first - start with just white knights on A & P, black on D & M, then swap.
Source: Original. Similar to previous knight-swapping puzzles.