Event: Doncaster League

Opponent Rating Result
John Smart 1715 ½ - ½
Gerald R Thickett 1458 1 - 0
Shane Williams 1488 1 - 0
Martin S Simmonds 1763 0 - 1
Alan J Smith 1600 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1765 = (8024 + 400 * (3 - 1)) / 5)

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