Event: NSDCA Division 3

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Opponent Rating Result
David A Hallen 1474 0 - 1
David A Hallen 1474 ½ - ½
Tim Twentyman 1702 0 - 1
George P Jelliss 1329 1 - 0
Charlie G Swinson 1231 0 - 1
Philip Grocott 1285 1 - 0
Robert Perry 1102 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1371 = (9597 + 400 * (3 - 3)) / 7)

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