Event: Finchley Cup

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Opponent	Rating	Result
Michael GA Wilson	1623	½ - ½
Michael GA Wilson	1623	½ - ½
Mark R A Murrell	1898	0 - 1
Mark R A Murrell	1898	0 - 1

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

1561 = (7042 + 400 * (0 - 2)) / 4)