◇ Just read — no move neededHigh, low, bottom
A crossed pawn keeps its full fighting value while it still has room ahead: a 高兵 (high pawn) has not yet reached the enemy's last two ranks, a 低兵 (low pawn) sits on the second rank, and a 底兵 (bottom pawn) has arrived at the very last rank. The bottom pawn can no longer advance at all — the saying goes, 底兵无用, the bottom pawn is useless.