4th Kyū

As for the Rook, it's quite straightforward — it can move to any square that shares the same file or rank.

The Queen can be thought of as a combination of the Rook and the Bishop.

The way we use the term 'legal moves' here is actually a bit imprecise. In a real game, you can't move to a square occupied by a friendly piece, and the King cannot move to a square that is under attack. Legal moves should properly be determined based on more complex conditions.

That said, let's start by practicing how to move pieces correctly in a simplified scenario where no other pieces are on the board.