The castling can be:
-illegal.
-castling rights lost permanently.
The first condition doesn't necessarily imply the second, because when the king is in check and can't castle, you can block the checking piece instead of moving the king to not lose castling rights permanently.
Then there are two cases:
- Castling is illegal but right not lost permanently.
- Castling is illegal and castling rights are permanently lost.
Does these 2 cases count as same or different positions in the sense of threefold repetition, if piece setup otherwise are the same? Reading FIDEs rules I can't figure this out.
-illegal.
-castling rights lost permanently.
The first condition doesn't necessarily imply the second, because when the king is in check and can't castle, you can block the checking piece instead of moving the king to not lose castling rights permanently.
Then there are two cases:
- Castling is illegal but right not lost permanently.
- Castling is illegal and castling rights are permanently lost.
Does these 2 cases count as same or different positions in the sense of threefold repetition, if piece setup otherwise are the same? Reading FIDEs rules I can't figure this out.