​Here, if it's white's move: the pawn can capture the bishop and the King cannot re-take due to the presence of the Border knight on a5. If black responds by taking the pawn with the rook, the knight can then take the rook. The King will reply with "re-taking." Consider if it's black's move: Given that major pieces on the Border do not have sanctuary from pawns, the pawn will take the Border knight, freeing the King to respond to the pawn if it takes the bishop.