Pseudocode for patching pawns

In the script that highlights the locations on the board, before you place down the highlight object:

if the selected piece is a pawn
	if the location is on the SAME row as the pawn and there IS an enemy chess piece in this location OR
	if  the location is on a DIFFERENT row as the pawn and there IS NOT an enemy chess piece in this location
		Exit the script without doing anything