Event: Roy Bennett Trophy Group A

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Opponent	Rating	Result
David S Johnson	1834	0 - 1
Andrew Crosby	1531	1 - 0
Rob Aked	1100	1 - 0
David S Johnson	1834	1 - 0
Andrew Crosby	1531	0 - 1
Rob Aked	1100	0 - 1
David S Johnson	1834	0 - 1

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

1481 = (10764 + 400 * (3 - 4)) / 7)