Event: 6-Board Division 2

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Opponent	Rating	Result
Sean Smith	1528	1 - 0
David J Gibson	1573	0 - 1
F Hal Jorna	1614	0 - 1
F Hal Jorna	1614	0 - 1
Andrew Donegan	1415	0 - 1
Colin W Field	1458	0 - 1
Dave M Cooper	1448	0 - 1

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

1236 = (10650 + 400 * (1 - 6)) / 7)