Event: Walker Shield

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Opponent Rating Result
Jimmy Phillips 1350 0 - 1
John L Clarke 1333 1 - 0
Daniel Allen 1188 0 - 1
George Allen 1089 ½ - ½
Seymour MacMahon 1300 1 - 0
John L Clarke 1333 0 - 1
Martin Jordan 1300 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1270 = (8893 + 400 * (3 - 3)) / 7)

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