Event: Division 4

Opponent Rating Result
David Collinson 1287 ½ - ½
David M Cotterell 1540 0 - 1
David M Cotterell 1545 0 - 1
Roy G Watson 1572 0 - 1
Shiva Ramachandran 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

869 = (5944 + 400 * (0 - 4)) / 5)

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