A far more complex is a case with blockaded rook’s pawns since the sacrifice of the passed pawn is not possible. This very instructive ending was first seen in the game Fahrni – Alapin. Since Black cannot access the c7-square due to Kc5, he is limited to alternating between d8 and c8, as a consequence, his king will occupy the same square after an even number of moves. It means that White will win if he can reach the same position after three moves – therefore, the solution is a triangulation i.e. the moving of the king along a triangle.