
I started out with 86 points (a mere 23 points above average):
Str: 15
Dex: 18
Con: 15
Int: 17
Wis: 8
Cha: 13
I have a whole bunch of mods. Grey Clan Episode One, The Siren's Call, Tactics and Sword Coast Strategems are the most relevant here. Especially Grey Clan adds a lot of XP. I used some of the improved fights from SCS/Tactics: Bandit Camp Tent, Ulcaster Vampiric Wolf (nasty!) and Final Fight.
I dual-wielded long swords. With the Gauntlets of Ogre Power, Long Sword +2 (from Greywolf) and Long Sword +3 (from a Grey Clan baddie) i had 3 Attacks with a THAC0 of 2/5. With the Long Bow of Marksmanship my THAC0 was 1 (3 Attacks also). With quadriple backstab i did 96 once (on a Kobold...).
Finally, i killed Sarevok by backstabbing him 4 times after taking a Potion of Speed and a Potion of 23 Strength. His cronies were tougher... :/