I'd like to have a go at working out the ratings of British GM Luke McShane
who has afaics played a lot of games recently and seems to be performing
very well. Anyway I Goooooogled for an online ratings calculator but then I
came up against K factor. Can anyone here explain K factor to me and what
values I should enter for a game between two GMs or a GM and an IM?

cheers

dd