You can read the rule for Advantage Dice in the Hubs and Spokes of BW, which you can download for free rom DriveThru, as per the link I posted just upthread. That will also show you the advancement rules.If this meshes with what @pemerton @AbdulAlhazred @Campbell and others have been saying this feels like it should be very helpful to me in thinking through things. So, I'm just checking if it is.
Here is the essence of the advantage rules (p 30 of Revised; the text in Gold is identical, I think):
Whenever a player can claim his character has a clear advantage . . . he gains +1D to the ability being tested. A player may only lobby for one +1D advantage per test.
The reason that players don't always want an advantage die is because of the advancement rules.
I already posted this, pretty similar, example upthread:Player walks up to a house door and says "I look for the key under the doormat"...a Very Reasonable thing. Player gets a 100 on the roll rule whatever. The GM says "nope no key"...also a Very Reasonable thing. Both player and GM grab the rule book an point to the "reasonable rule"....and what, the game ends?
Resolving the key under the doormat - using Perception, or Folkways-wise, or Keys-wise, or even Doormats-wise - would follow the same process.Here's an example from the Burning Wheel Adventure Burner (p 232):
a group . . . needed to sneak into a well-guarded citadel tower. One player chimed in, "I have Architecture. I want to use my knowledge to find us a secret entrance."
There's intent and task - if it succeeds, the PC finds the secret entrance they are looking for; if it fails, the the GM establishes a consequence.
Looking for piles of gold under random trees looks to me like it might fail a credibility test - it seems to be in the same neighbourhood as finding beam weaponry in the Duke's toilet.Player walks over to a random tree and says "I keep and eye out for a pile of gold". Player succeeds a scavenger check. GM says "you find a pile of gold under the tree". Same thing.
On the other hand, if the player is able to FoRK in Faeries-wise then it seems like a legitimate check! The Obstacle seems like it might be fairly high, though.