Perhaps when they have a level of mastery advantage over the resistance? Does this sound right? So this would be ability/5 - 4 bonus granted.
Ie if you have strength 5w1, that gives you 5-4 =1. This would be a roll of 5w1 vs 5. If you have a strength of 5w3, that is effectively 13-4 = 9. To get a bonus of 9, you would roll against a resistance of 45, which becomes 5w2, which after cancelling mastery becomes 5w1 vs 5 again.
(this is for ability bonuses - double the bonus granted to get the edge granted.
Of course, the narrator always gets to force a roll for important scenes, and the player can always force a roll by going for a higher advantage etc. The narrator can always just say 'nope, that doesn't apply here', or declare that this time it has a big improvisation bonus ('you can't properly use your strength while hanging from a rope' etc).
Cheers David
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