Here is a comparison of some different handicap systems in use on 9x9 (including the Nijmegen system) [2021 Rating and rank adjustments - #528 by gennan]
AFAIK there is no international standard.
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Here is a comparison of some different handicap systems in use on 9x9 (including the Nijmegen system) [2021 Rating and rank adjustments - #528 by gennan]
AFAIK there is no international standard.