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C7B1: Nudge along y, for an east or west arch
Input
IX the arch's record
IY the player's record
adj_ew C7B1 LD A,(IX+$0A) already on the centre line
C7B4 CP (IY+$02)
C7B7 JR Z,arch_nudge_done
C7B9 LD A,$01 +1 if the middle is at a greater y, else -1
C7BB JR NC,nudge_y_store
C7BD NEG
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