Event: Walker Shield

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Opponent	Rating	Result
William Horsford	1467	0 - 1
William Horsford	1443	½ - ½
Robert Twigg	1429	0 - 1

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

1180 = (4339 + 400 * (0 - 2)) / 3)