Event: 54th Cotswold Minor

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Opponent	Rating	Result
Ben Hughes	1210	1 - 0
David Purle	1488	1 - 0
William Purle	1573	0 - 1
Stephen Williams	1598	0 - 1
Tommy Burns	1067	½ - ½

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

1387 = (6936 + 400 * (2 - 2)) / 5)