3 ms·
Castling requires no prior moves by either piece (King or Rook). Move the King once and back early on, and later, although the board looks set for castling, the
by aaronchall 2y ago
Castling requires no prior moves by either piece (King or Rook). Move the King once and back early on, and later, although the board looks set for castling, the King may not.
- viraptor 2y agoYes, which means you carry one bit of extra information - "is castling still allowed". The specific moves that resulted in this bit being unset don't matter.
- aaronchall 2y agoOk, then for this you need minimum of two bits - one for kingside Rook and one for the queenside Rook, both would be set if you move the King. You also need to count moves since the last exchange or pawn move for the 50 move rule.
- viraptor 2y agoAh, that one's cool - I've got to admit I've never heard of the 50 move rule.
- User23 2y agoAlso the 3x repetition rule.
- chipsrafferty 2y agoAnd 5x repetition rule