Nunn on the K-factor: show me the proof!

By master

With the debate raging over FIDE’s decision to change or not to change the K-factor used in calculating players’ ratings, we are glad to receive an important message from our voice-of-reason grandmaster. Dr John Nunn says “there seems no real evidence that K=20 will result in a more accurate rating system, while there are a number of risks and disadvantages.” His explanation and reader feedback.

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