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Nearly everything in 2nd edition D&D rules whic are used in BG2 is lower means better accept for hp and mony arrows and such.
THACO means To hit armor class 0. so it has something to do with how well you can hit low armor classes.
Most spells have saves. If it's cast at you, and you're allowed to make a save (look in the spell descriptions if you want to know which) the computer (I think) rolls a dice and adds your bonus (in your character record) to it. if you have rolled high or low (I'm not sure on this) enough the spell has less effect or are somne effects cancelled. The computer calculates this and doesn't show it so you don't notice it except for the spells having less effect sometime.
THAC0+3 means that if you have the weapon equiped you have a higher THAC0 so more chance to hit something.
1D10+2 means that damae is calculated by rolling 1 dice of 10 adding 2 to this.
the numer before the D is how many dice are rolled and the number behind is which dice are rolled. (in D&D the following dice are used D4, D6, D8, D10, D12,D20 and D100)
Which sword is best depends on what you're fighting. 1D6+3 does more damage but can hit less and the 1D6+2 can hit more but does less damage. Some monsters need weapons which are at least THAC0+3 or +4
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