Event: Ipswich Chess Club Championship

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Opponent	Rating	Result
Adam Wilson	1417	1 - 0
Philip J Chapman	1287	½ - ½
Andrew Shephard	1858	1 - 0

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

1787 = (4562 + 400 * (2 - 0)) / 3)