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I analyzed the data of bouldering grades available on Kaggle and discovered that not all grades contain the same difficulty range. While a runner knows that shaving off a minute from his 30 minutes run is about as hard as shaving a minute from a 29 minute run, it is not the case for climbers. When using the Fontainebleau grading system, it is on average 60% harder progressing from a grade without a “+” then with a “+”.

The code I used to perform this analysis is here as a Jupyter notebook, it includes additional technical details.

For most people…

Etienne Pepin

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