While a multiclassed Fighter/Thief can use any weapon that a Fighter can, only the Thief weapons are suitable for backstabbing. In BG, exceptional strength does get multiplied for backstabbing. I once had a dual classed Fighter/Thief backstab for 118 pts of damage!! (a 20 was rolled) Too bad it was wasted on a common creature. I've heard in BG2 that strength will NOT be multiplied. Also, the +3 Short Sword of Backstabbing may not be the best weapon out there for the task.........
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