Perhaps [MENTION=762]Mort[/MENTION] can chime in, but I didn't read the OP as suggesting that the established fiction be changed.
If the map of the city is drawn up, the path decided, and the map considered part of the setting, it's changing the fiction (to my group). Mort said:
Mort said:
The DM looks at his map and sees that the villain is going by a direct route with the players unlikely to catch him. Assuming teleportation magic is not at play does the DM a) give the players no option other than to try and catch the villain by directly following him or b) allow the player (assuming he rolled well on a geography check or similar skill roll) to find a previously unknown route (maybe not even on the map) that allows them to catch the villain (essentially changing the reality of the game world as he planned it)?
To me, when he indicates "changing the reality of the game world as he planned it" and he has a drawn up map of the city with which he could reliably use up to this point as a part of the setting, changing it would be changing the setting (which is part of internal consistency, much the same way I'd consider "established fiction" to be).
As I read it, the suggestion was precisely that it was
notestablised in the shared fiction that there was no shorter route. (There may have been no alternative path indicated on the GM's map, but the GM's map is not the shared fiction - as Vincent Baker talks about
here, the GM's map is the GM's initial plan for how to contribute content to the shared fiction.)
I guess it'll depend on the group. For example, I basically only use regional or continental maps. My players have access to these, and use them to great extent to plan and plot. To change this map would certainly be drastically altering the setting. To me, I don't have a "GM's" map. And, just like most thing you link from Vincent Baker, I strongly disagree with what you're putting forward as I understand it (and no, I didn't read anything from the link). If I have a map as GM, it's now set in the setting. I will not be changing it for convenience's sake. I might expand focus to something not covered, yes. Like I said, my maps are continental, and just because there's no wild game or edible vegetation on the map, it doesn't mean it's impossible to survive in the wild. No, that's not what's important to the map, and it's not on it. However, in a city map, with streets already mapped out, there will be absolutely no change to it simply because the players haven't seen it. And they would not want me to, either.
You know, that was presumptuous of me. I apologize. I try not to put words in people's mouths without a qualifier ("as I understand it" or the like).
The NPC gets to decide, in character, to take the shortest route, just as a player might decide for his/her PC. But then - just as would be the case for a player - the GM must engage the action resolution mechanics to see if the NPC succeeds in achieving his/her intention. Maybe s/he is ignorant, and there is in fact a shorter way. Maybe s/he is short, and for the taller there is a shorter way that requires jumping a fence too high for the NPC. Maybe, unbenknownst to the NPC, there are roadworks taking place on his/her preferred route.
Right, okay, this makes sense to me. And, according to the OP, the NPC was taking the most direct route. Maybe the NPC rolled a Local or Streetwise check to find the most direct route, and got it. It's not opposed by the PCs. It's just static, as it'd be exactly the same whether or not it's opposed. And, according to the OP, they're taking the most direct route. However, changing the map or dismissing it wouldn't go over well in my group based off of a high PC roll. It'd be bypassing the internal consistency of the setting (setting or established fiction), and that's very much against what we want out of the game.
Just as for the playes, so for the GM in resolving the NPC's action - there are any number of reasons why an intention could misfire in some way, and when there is something at stake, I'm not a big fan of the GM deciding unilaterally, without engaging the mechanics, that the NPC automatically succeeds.
I'm near-positive that after your initial post saying you'd use mechanics to resolve this, I quoted you and posted that I agree.
Why you assume I wouldn't use mechanics to resolve this is still exceptionally unclear to me. I would let the NPC make a check to know the most direct route, but if he gets it, he gets it. PCs rolling high won't allow a new route, it'll just tell them the same route (assuming they aren't all amazing acrobats or the like, but if they were, they'd probably just say, "I want to run across the rooftops as the crow flies to the location we think he's headed" and be done with it). No, in a party that will vary in skill and likely in height, most of the time it'll be the same as the villains. And, I think saying so isn't unreasonable. YMMV.
As always, play what you like
