by paulidale
No need for a simulation here, the averages of various attacks can be worked out exactly. I did this years ago and have a note somewhere with the various probabilities.You missed the variance -- a white die has a 2 in 3 chance of rolling a zero e.g. With two white dice, you've a 4 in 9 chance of rolling a zero total i.e. about 44% and a 5 in 9 of killing that Gretchin (about 56%). Not exactly reliable :-)
There is a nice probability table in the files section too.
- Pauli