Optimum Level of Deceptive Attack

[dublindog]

Min/maxers rejoice, I have calculated the optimum levels of Deceptive Attack you should take, assuming knowledge of the defender's Active Defense score.
UPDATED!
http://img696.imageshack.us/img696/4...eattacksma.png

This was accomplished by calculating the overall probability of a hit (attack succeeds, defense fails) including Critical Hits and automatic Fails. You'll notice the effect of critical hits along the bottom especially, where you lose the benefits of DA by dropping your chance at a critical hit (on a 5 or 6) combined with the odds of a defense roll of a 17 or 18 always being a failed defense (lowering a defense of 18 to 17 or 16 garners the attacker no benefit in odds of a successful attack).

The rules prevent you from dropping your effective skill below 10, so I started the chart at Skill = 12. And while I've never run across such a high defense in a real game, I assume it's possible and so there's no reason not to include all possible defense scores.