Another example, I did a (I thought) unclimbed route at Coles Bay a few months ago. I lead it and thought in my head 'grade 17', when my second came up he said 'grade 12'. A few weeks later an update to the guidbook got published including the supposed 'unclimbed route', which someone else had done 6 months before, in the update it was graded 19.
Thats a possible 7 grade variation between three climbers opinions!
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