Event: B&DCL Div 4

Opponent Rating Result
Tony Sanderson 1500 0 - 1
Michael N Davidson 1458 1 - 0
Ron Salinger 1443 ½ - ½
Joe Wood 1420 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1555 = (5821 + 400 * (2 - 1)) / 4)

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