Yes, that is a hard one, but the following tactic might just work:
Equip your best fighter so that he has the lowest ac possible, cast haste/improved haste and chaotic commands and other protective spells on him/the party (like protection from evil, defensive harmony, chant, etc), have the rest of the party stand back to later attack with range weapons/spells (magic missiles works fine against creatures with high magic resistance, I think melf's minute meteors count as +5 weapons), summon a couple of monsters as cannon fodder and then "summnon" the balor. I think you need plus three magical weapons or better to hit him, though.
Good luck !
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So long !
R³ - Co-president(s) of the Club of Broken Hearts
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