Using Roman numerals, it was originally intended to run from I ( easiest ) to VI ( hardest ), but as with all other grading systems, improvements to climbing standards have led to the system being open-ended after the grade VII was accepted in 1977.

Using Roman numerals, it was originally intended to run from I ( easiest ) to X ( hardest ), but as with all other grading systems, improvements to climbing standards have led to the system being open-ended.

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