Warning: Don't forget that players' ratings are updated after each match. So winning against one player may not produce the same outcome at the beginning of a tournament or at its end.

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Tip: you don't need Internet to use this calculator, once the page has been loaded in your browser you can use it offline as long as you don't close your browser.
Another possibility is to save this page from your browser into a folder on your computer and then it can be executed offline by double clicking on the saved page.