Hi Tom,

Every time you halve the thinking time you can decrease roughly 60 Elo. Not always exact but will give you an idea.

Fore example if a machine is rated 2000 Elo at 3 min per move
it will be 1940 Elo at 1 min 30 seconds per move so on.

Again not always correct but mostly works at long time controls.

Rating at blitz speeds are another story.

Murat

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