A "Backstab" doesn't literally have to be a piercing stab from behind, just a surprise attack at vital areas when the victim isn't prepared. Otherwise, blunt weapons like Clubs and Staves could not be used to Backstab (some call this Backwhacking).
romeck, you have been misinformed: Thieves in BG2 cannot Backstab with 2-Handed Swords, unless there's some funky 2-Hander that can be used by Thieves (which there isn't).
Backstabbing with Scimitars in BG1 is iffy: According to BG1 rules, Thieves cannot use Scimitars. The Scimitars that are added into game when you install ToSC reflect this: They are not valid Backstab weapons for Fighter/Thieves (or, if you have BGTutu installed, Stalkers). However, there are a couple of Scimitars in the original installation of BG1. Since the classification of 'Scimitar' hadn't yet been written into the game, the default-BG1 Scimitars are instead classed as Long Swords: Thieves can use them (but Druids, I believe, cannot), and Backstab with them.
In BG2, the rules change a bit: All Scimitars are valid Thief weapons.
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Volothamp's Comeuppance
Everything you ever needed to know about the entire Baldur's Gate series......except spoilers.
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