You could do something like d6, d5, e6, or e5, or other moves. Using x is when you are capturing another piece.

• K = King
• Q = Queen
• R = Rook
• B = Bishop
• N = Knight
• (no letter) = Pawn (Pawns are referred to by the squares they move to; they don’t get an individual letter.)

invalid capture move for pawn: c4

Reply with only the move to continue a game; without a mention. Mention triggers a new game.

failed to create new game from item 735169: invalid capture move for pawn: c4

K6

invalid move: 6