Event: Walker Shield

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Opponent Rating Result
David Marsden 1430 0 - 1
John L Clarke 1342 1 - 0
Charles EASTON 1428 0 - 1
Bob Wallace 1374 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1194 = (5574 + 400 * (1 - 3)) / 4)

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