Sente's turn to play. This is a Yagura endgame position where Gote played G43-42 to try to let the 41 promoted Bishop go away(For Firefox users, please forward one move from the displayed position to have the problem. Sorry, this cannot be displayed on some smartphones). Please find a three-move-approach to Gote's King in Yagura castle. This problem is to show that it is easier to approach the King in Yagura when your Rook file is semi-opened comparing with the situation that your Rook pawn still stays on the Rook file such as a 25 or 26 pawn. You can replay the answer line by clicking the arrow directing to the right under the diagram. Also, an exclamation mark sometimes appears there on a specific move during your replay, then click it and you can read my comments on that move.