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Swap the white and the black figures.
wap the black and white knights in the fewest moves
Swap the white and the black figures.
Swap the white and the black figures.
You Win!
Shaping the chess board into the stylized FISH makes this puzzle intriguing. The nature of the chess knight's move is so elusive, that though the board seems to be tightly packed in its initial position, each of the 8 knights on the board has a chance to make an opening move.
The lower-left-upper-right diagonal line of symmetry plays a role in solving this puzzle to some extent. A solver would naturally tend to replicate the same moves for the white knights as they are performed for the black ones, based on their relation to that line.
With 20 moves required this challenge defiantly tends to the harder level of difficulty. Though not a reason to give up!