Sure, I might have expressed myself clumsily and perhaps incorrectly.
Thanks for pointing this out.

Here’s another try: If you mix source code from SCID and Chessbase into one thing, and want to distribute that mixed thing, there are only two ways to do so. One is to go within what copyright laws ...

Hagen, thanks for your kind words. It means a lot.

Sorry for reviving an old thread, but I didn’t know about this.

I designed this 2d-representation of Hartwig’s classic Bauhaus style chess set (without permission from Hartwig, because, well, he died) and submitted it to SCID.
I made it in the special format that SCID’s source code uses, which is ...

!SquaresBetweenTheKingAndRookAreAttacked

This is incorrect.
It’s the squares between the king and the king’s target square that must be unattacked. Not all the squares between the king and the rook.

So check for these three things:

The king and rook involved can’t have moved.

There can’t be ...