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With the change in chapter approved there is now a first turn roll-off.

1) Can you spend a CP to reroll this?

2) If the answer to (1) is yes, then, if, say, I rolled a 4 and my opponent rolled a 3, then they rerolled and rolled a 5, would I be able to use a reroll at this point?

So far we only have a snippet/preview of the rules from Chapter Approved, so there is no way to know what else is written in there. However,




BRB states you can spend CP on Strategems, "Before or during a battle"



So, yes, you can both re-roll any of the dice you each roll during deployment/before the battle. In Matched Play, each strategem can only be used "once per phase" - so additionally, you could in theory re-roll any and all dice you roll during deployment (roll for choice of turn, seize the initiative, etc) provided you pay the CP to do so, since it isn't a phase there's no restriction on using the strategem multiple times during deployment. This is the same logic a Space Marine army would use to apply the same strategem to multiple units in its army during deployment.

Provided that your army is Battle-forged, of course. Otherwise no CP for you - or Strategems.

The ITC prohibits rerolling this roll off for this reason. As it stands it's totally unclear if you can use the stratagem in a roll-off in response to the opponent using it.

1) Yes
2) No, no dice roll can be re-rolled more than once.

 JohnnyHell wrote:
1) Yes
2) No, no dice roll can be re-rolled more than once.

But he'd be rolling his die, his opponent having re-rolled his own die.

I think yes, you can re-roll the first-turn die, and in response to that, of course your opponent can choose.

Think of it as game-states:
[Current Game State: Opponent has a 2 and +1, I have a 4]
Opponent chooses to Reroll:
[Current Game State: Opponent has a 4 and +1, I have a 4]
I can now choose to Re-roll:
[Current Game State: Opponent has a 4 and +1, I have a 6]

We begin the game, me going first, with both of us out one CP.

 Overheal wrote:

 JohnnyHell wrote:
1) Yes
2) No, no dice roll can be re-rolled more than once.

But he'd be rolling his die, his opponent having re-rolled his own die.

Oh I read wrong - in which case 1) Yes and 2 ) Yes! Thanks for the error spot.

RAW yes.

Callidus assassin's n even references use of CPs before game starts.

You can't wait for your opponent's result on a re-roll and then choose to re-roll your own die:

Q: Can I use the Command Re-roll Stratagem to retroactively
re-roll a dice? For example, if I take a Psychic test, and
then my opponent successfully Denies the Witch, could I use
the Stratagem to try and increase the result of the original
Psychic test?
A: No. You must use the Stratagem as soon as you have
rolled your dice, before anything else occurs.

In your first turn roll-off example, you would be retroactively re-rolling, which is prohibited. What you can do isn't clearly stated, however. If you originally roll a '2' and your opponent a '1', and he chooses to re-roll, you may simultaneously declare a re-roll? You just can't decide after the result of your opponent's re-roll.

 Oaka wrote:
You can't wait for your opponent's result on a re-roll and then choose to re-roll your own die:

Q: Can I use the Command Re-roll Stratagem to retroactively
re-roll a dice? For example, if I take a Psychic test, and
then my opponent successfully Denies the Witch, could I use
the Stratagem to try and increase the result of the original
Psychic test?
A: No. You must use the Stratagem as soon as you have
rolled your dice, before anything else occurs.

In your first turn roll-off example, you would be retroactively re-rolling, which is prohibited. What you can do isn't clearly stated, however. If you originally roll a '2' and your opponent a '1', and he chooses to re-roll, you may simultaneously declare a re-roll? You just can't decide after the result of your opponent's re-roll.

Except that Deny the Witch doesn't happen at the same step.

3. Deny the Witch Tests
A psyker can attempt to resist a psychic
power that has been manifested by an
enemy model within 24" by taking a
Deny the Witch test – this takes place
immediately, even though it is not your
turn

DTW tests happen in direct reaction to a successful result by the active player: it is not rolled-off alongside the physic power manifestation test, it only occurs after a successful test is processed.

In a roll-off, both players roll two separate results at the same time step. They are both rolled under the same trigger action and whether the result of player A's die lands on the table before player B's die - or vice versa - is irrelavant, all that matters is which of the two results is greater than the other. So, if one of the two payers is allowed to use CP to re-roll one of these die in a roll-off situation, it naturally follows that the other player may do so as well.