I was asked an interesting question today which I don't know the answer to.
If an NPC has a chance at doing something, but success isn't guaranteed, how do you decide what happens? Particularly in a game with 1 GM and 1 PC, this can become important.
I know the principles of Think Dangerous might apply, or your Fronts and Grim Portents or the fiction at hand may tell you what to do. You could also maybe disclaim decision making by asking a PC what happens, but sometimes these seem not enough.
An example from a game I ran with a different system:
The PC alerted an NPC to an attack on the NPCs life. So, now the NPC was prepared, but survivng the attack was still not guaranteed. In that game, I made up stats for the NPCs and did a few quick rolls to simulate the situation and fight they would've found themselves in. In the end, the NPC won, but she could've easily died. How would you do this in Dungeon World?
Another simpler example:
Two NPCs, pretty equally matched, are duelling to the death. How do you decide who wins?
Another one:
An NPC is climbing a treacherous cliff-face in the rain. It's possible to make it up there, but it's tricky. How do you decide if they succeed, partially succeed, or fail?
Important to note here, is that in these situations the NPC isn't helping/hindering the PC. The PC might not even be there, yet the event is still important to the fiction and deciding a result without some sense of randomness or chance, doesn't sit right.
I haven't run a 1 GM, 1 PC game of Dungeon World yet, but I plan to. Often in games like that an NPC will fill the place of a PC to round out the small party. I could use Hirelings, but this doesn't really fix much. I feel like I should probably stat the NPC up like a monster, which helps some (I now know how much damage they deal, their HP and armour, what moves they have, etc.). However, seeing as PC moves don't apply to NPCs, I can't use Hack and Slash when they fight in a duel, because NPCs don't have STR.
I could also write custom NPC versions of Basic Moves, but it seems a bit excessive. Perhaps I should fill out a PC character sheet for them and treat them just like a player?
If anyone has any advice, custom moves, or play experiences that could help, I'd appreciate it. Thanks!