doing maths?

Hi guys need some help.I have a database which has the normal login username password etc in it but I have a colome that has a score in it, I want to be able to go to a page on my site , input in wether 2 players had played each other by using there User id number and I indicate who won with a check box and then submit that result, I need the server too run some maths (ELO CALCULATION) and then change those 2 players scores according on the database. For eg Player A has 1006 and player B has 1001 on the input page I put in both players id numbers and check the box next to player A indicating that player a won. Then the server does the rest. Any help would be great in its most simplist form as iam very green on PHP cheers

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