THACO low, good.
THACO high, bad.
Some examples... ...
Enemy has an AC rating of -2
P1's THACO is 20, 20 - (-2) = 22. He needs to roll a critical strike(20) on a 20-sided dice(d20) to hit the guy.
P2's THACO is 10, 10 - (-2) = 12. Anything that is 12 and above from a d20 roll is a hit.
P3's THACO is 0, 0 - (-2) = 2. Short of a critical miss(1), any roll from a d20 is a hit.
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