Event: Division 2 - Weston Trophy

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Opponent	Rating	Result
Craig Chatterton	0	1 - 0
Chris G Willey	140	1 - 0
T Ed Sowerby	119	½ - ½
Tim Humphries	0	½ - ½
George Peters	137	½ - ½
Alan S McIntosh	146	½ - ½
Ken Hunter	146	1 - 0

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

270 = (688 + 400 * (3 - 0)) / 7)