Event: Walker Shield

Opponent Rating Result
Joshua Hayhoe 1072 0 - 1
Jack Evans 1400 ½ - ½
Joshua Hayhoe 1072 1 - 0
Martin Jordan 1252 ½ - ½
Phil Evans 1400 1 - 0
Sebastian Burford 850 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1174 = (7046 + 400 * (2 - 2)) / 6)

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