Instead of using a counter, I would use one register for the X axis and another one for the Y axis. Let's say R[1] and R[2].
Then, I would put an IF statement at the end, checking if I'm at the problematic position.
If you have few specific positions you could do something like this:
IF (R[1]=3 AND R[2]=3), JMP LBL[1]
IF (R[1]=3 AND R[2]=5), JMP LBL[1]
IF (R[1]=4 AND R[2]=1), JMP LBL[1]
If it's a continuous range of positions you could do this:
IF (R[1]<=X AND R[2]<=Y), JMP LBL[1]
Hope it helps