Event: Worcestershire Challengers' League

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Opponent	Rating	Result
Friedrich Quigley	1785	½ - ½
Paul B Sharratt	1729	0 - 1
Ian J Clarke	1978	0 - 1
Scott Russell	1769	½ - ½
Rob Sutton	1687	½ - ½
Scott Russell	1769	½ - ½
Julie C Wilson	1724	0 - 1

performance = (sum(opponents ratings) + 400(wins-losses)) / games

1606 = (12441 + 400 * (0 - 3)) / 7)