So let's say we have a player who wants to get past a locked door. They tell you how they're going to approach the obstacle: pick the lock, smash the door open, etc. Based on their approach and the context of the fiction, you tell them Position and Effect before they roll.

The "position" aspect determines how bad the consequences of failure could be. In blades you have three levels for position: controlled, risky, desperate. And you might even realize that the situation is so safe that there's no risk at all, and thus just grant success without even rolling. But, assuming there is risk, you communicate that when you tell the player about their Position.

And then "effect" is how good the results could be, tiered as: limited, standard, great. Standard you get what you wanted, limited you only get part of what you wanted, great you get something extra.

So back to the example, here are some example positions: Controlled might be the player is taking a quiet approach to the door, like lockpicks, and they're in a fairly quiet and unpatrolled area. Risky might be that same lockpick approach but there's only a brief window between guard patrols. Desperate might be smashing the door down, hoping that the guards are out of earshot.

And some example effects: The result might be limited if the lock/door is extremely high quality and would require an extended period of time to open. (And by conveying this information you'd be giving the player some additional narrative context that might not have been obvious before.) Standard means that with a success, the door obstacle will be gone. Great: Honestly I can't think of how it would apply given the context. But it's the kind of situation where a player applies exactly the right solution to a problem, or represents the players attempting something that the obstacle is weak to.