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What are V-grades?

V-grades are ordinal values that rank the difficulty of a boulder problem. The system is widely used in the US, indoors and out.

The eponymous V system was invented by John "Verm" Sherman in the 1980s. While bouldering at Hueco Tanks in El Paso, Texas, Sherman used it to grade problems in his guidebook.

The scale, at present, ranges from V0 to V17. The designation "VB" is sometimes used to describe a problem easier than V0.

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