My wife and I are beginners and we're stuck on a rule dispute.
Black has king at C2, a knight at C3, and a queen at G3.
White has a rook at C8, a rook at E5, and a king at D6.
It is Black's move. Black moves the Knight protecting the King to E4. That is the dispute. White is saying Black cannot make that move because that leaves the Black King open to check from White Rook at C8.
Black says the move is legal because White's next move must be to protect White's King from the Knight that moved from C3 to E4.
In other words, can Black (who is not in check) make a move that exposes their king as long as the move checks the White king? Black's stance is that White's next move must be to protect the White King from the Knight.
Here is the position a little more clearly (I believe you got the board notation flipped upside down):
Black cannot move the knight on f6. It is pinned to the Black king. Here is an easy way to think about it: if the knight were moved, then White would take the Black king on the next move and win.
My wife and I are beginners and we're stuck on a rule dispute.
Black has king at C2, a knight at C3, and a queen at G3.
White has a rook at C8, a rook at E5, and a king at D6.
It is Black's move. Black moves the Knight protecting the King to E4. That is the dispute. White is saying Black cannot make that move because that leaves the Black King open to check from White Rook at C8.
Black says the move is legal because White's next move must be to protect White's King from the Knight that moved from C3 to E4.
In other words, can Black (who is not in check) make a move that exposes their king as long as the move checks the White king? Black's stance is that White's next move must be to protect the White King from the Knight.