The 1-step fast castling should now work too: if the square next to the King is empty, it will be highlighted, but the Rook in that direction will also be highlighted (if both K and R are virgin). Clicking the Rook would then do the fast castling, clicking the empty square would just move the King there.
The 1-step fast castling should now work too: if the square next to the King is empty, it will be highlighted, but the Rook in that direction will also be highlighted (if both K and R are virgin). Clicking the Rook would then do the fast castling, clicking the empty square would just move the King there.