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Here's a small head-scratcher for you all today.

enter image description here

In the above position, it is White to play and mate Black in four moves, assuming that Black plays their best moves.

However, there is a catch—there are two solutions here. One is legal, and the other isn't. The task is to find both possible solutions

State which ONE rule of chess is being broken (minus the illegal position of the White pawn on c1) in the Illegal solution.

Clarifications:

  1. "Legal" chess moves means that it is accordance with the FIDE laws of chess. So an illegal solution would contain a move that is illegal under that rule set.

  2. All of the pieces move normally.

  3. Pieces cannot occupy the same square.

Have fun solving!

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I'm going with the legal version being:

1. Ra8 b5
2. Rh8 b4
3. Rh2 b6
4. Rf2#

And the illegal one being:

1. Ra8 b5
2. Rh8 b4
3. Rh1 b6
4. O-O#

Where the illegal move is castling after the king side rook had already moved or been taken.

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  • $\begingroup$ Good job! The whole idea was for the King to do it with the opposite piece. When making this, making sure that there was only two possible solutions was a freaking NIGHTMARE. I was effectivly forced to illegally put a pawn on c1 to preserve the problem. $\endgroup$ – Rewan Demontay Aug 16 at 0:08

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