Event: Division 2 - Weston Trophy

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Opponent	Rating	Result
Alejandro Lopez-Martinez	0	1 - 0
John Baker	146	1 - 0
Alan W Potts	0	½ - ½
Kevin R Marshall	142	0 - 1
Tim Humphries	161	0 - 1
Tim Humphries	154	1 - 0
John R Mercy	153	1 - 0

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

222 = (756 + 400 * (4 - 2)) / 7)