In the Arkham Horror board game, consider the following:
I am about to do a combat check fighting a monster. I already decided I want to use a spell in combat (e.g. "Wither"; it is untapped, I have enough hands). Can I roll the dice without casting the spell at first and if it is not enough, try casting the spell and (if successfull) roll additional dice?
I could not find a convincing answer in the rules and FAQs. It definitely states two different things:
- In order to use spells, you have to have enough hands
- In order to gain their bonuses, you have to successfully cast them
So while you have to decide on the choice of your weapons / spells / hands before a combat check, just carrying a spell (or, more accurately, "spellbook") into combat does not seem to force you to cast it. Moreover, using hints works exactly this way (you can choose to use them to roll additional dice).
Is there any information on this that I have missed? I know the question might seem odd at first, but the longer I think about it, the less sure I am about the answer.