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As part of writing the guide I will have to spend a good bit of time thinking and talking about grades - whether I like it for not. Grades are a nessacary evil. Their purpose is to indicate problems which one might have a reasonable chance of success or an entertaining failure. However they have become a proxy for a lot of other things.
What grade is a two armed pull up? Surely for such a simple movement we could easliy reach a consensus and if we can't what hope to we have for a boulder problem that requires multiple complex movements.
Gradewise I would say a two arm pull up is around 3+ and a one armer is around 7a. But its a pointless question really.
Maybe the more variables their is the more likely the grade is to be accurate. For example for a pullup no amount of technique or height will make it easier. If a long problem has one move a bit harder than the rest this will have less effect on the overall difficulty than if this move was the only one.
Basically I'm just saying that grades are a load of bollox.