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I was just re-reading some of the eldar psychic power rules and I couldn't help but notice that guide says that "This unit re-rolls any failed to hit rolls made in that turn's shooting phase, If the unit is using a guess range weapon (such as a D-cannon) you may re-roll their scatter dice instead."

Since I can't find anything in the FAQ regarding guide and a blast weapon such as a missile launcher firing in plasma mode is neither a guess range weapon nor does it make "to hit" rolls that guide has no effect on such a weapon.

Is this correct?

In the rule book it mentions that blast weapons with a re-roll simply get a reroll to the scatter dice.

Guide works fine for them.

Guide, however, does not do anything to template weapons (flamers, destructor, etc) as it does not "twin-link" the weapons.

ah thanks for that, I had thought that rule was specifically for twin linked blast weapons but it is much broader.

Blast weapons that gains a reroll to hit must reroll both the scatter die and the 2d6 (or similar) for range. See rulebook page 30 - Blast weapons and rerolls. I think that interpretation of Guide is pretty consistent with how guess range (=Barrage in 5th edition) work.

Anything that lets you "re-roll to hit" with a Blast Marker Weapon allows you to re-roll BOTH the Scatter Die and the 2D6, with the second result being the final result, even if you would rather have the first result.

So at what point to you decide to re-roll? if the 2d6 is greater than 7?

this is besides the obvious situations where the blast lands in the middle of nowhere or on your own unit etc.

Deuce11 wrote:So at what point to you decide to re-roll? if the 2d6 is greater than 7?

this is besides the obvious situations where the blast lands in the middle of nowhere or on your own unit etc.

You re-roll it after you have rolled the first time but before you work out how many hit's it has caused. So say you roll the first time and roll 9 + an arrow (Resulting in 6" Scatter), you can then immediately re-roll it if you so wish. If for that second roll you then roll a 12 and an arrow, you are stuck with it

i am asking more generally as a rule of thumb. Or is it impossible to to make a rule of thumb?

i guess its a mathhammer question. any blackjack or craps players out there haha

oh yeah and do you measure to find where the blast lands before deciding to re-roll?

Deuce11 wrote:i am asking more generally as a rule of thumb. Or is it impossible to to make a rule of thumb?

i guess its a mathhammer question. any blackjack or craps players out there haha

oh yeah and do you measure to find where the blast lands before deciding to re-roll?

It actually doesn't say either way, so clear it up with your opponent first.

Here is from a statistics point of view, all percentages are averages:
42% of all 2d6-rolls end up 8+, so if you reroll a deviation of 8 or more you have a 72% chance of getting a better result (that means a Hit or a deviation of 2 to 7).
58% of all 2d6 rolls end up 7+, so if you reroll a deviation of 7 or more you have a 61% chance to improve the result.
72% of all 2d6 rolls end up 6+, so if you reroll a deviation of 6 or more you have a 52% chance to improve the result.
83% of all 2d6 rolls end up 5+, so if you reroll a deviation of 5 or more you have a 45% chance to improve the result.

In practice, a deviation in a good direction might be just as good as a hit. If your opponent has spread his 25mm bases in a perfect 2"-spaced hexagon grid you will actually get more hits with a small blast template on a 1" scatter than on a hit, since you need to center the marker over a model.

perfect