Event: Walker Shield

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Opponent	Rating	Result
Joshua Hayhoe	1218	0 - 1
Graeme Boxall	1417	½ - ½
Bob Wallace	1387	½ - ½

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

1207 = (4022 + 400 * (0 - 1)) / 3)