Event: Walker Shield

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Opponent Rating Result
Graeme Boxall 1422 ½ - ½
Sean Duffy 1105 0 - 1
Bob Wallace 1408 0 - 1
John L Clarke 1394 1 - 0
Don Richards 1398 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1265 = (6727 + 400 * (1 - 2)) / 5)

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