Event: Summer League Division 3

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Opponent	Rating	Result
Brian Crofts	1553	½ - ½
Andrew Birtwhistle	1741	½ - ½
Duncan Chambers	1677	0 - 1
John A Clark	1762	0 - 1
George Swanson	1615	0 - 1
Brian Crofts	1586	1 - 0
Steve Moon	1534	½ - ½
John A Clark	1754	0 - 1

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

1503 = (13222 + 400 * (1 - 4)) / 8)