Event: Division Four

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Opponent Rating Result
David Smith 145 1 - 0
John Lunn 124 ½ - ½
Rich Wiltshir 144 0 - 1
Fred Biles 95 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

227 = (508 + 400 * (2 - 1)) / 4)

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