Event: Division 7

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Opponent Rating Result
Arthur Gaseltine 1498 1 - 0
Dave Mellon 1530 ½ - ½
Oliver Warnock 1109 1 - 0
Michael J Lord 1521 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1615 = (5658 + 400 * (2 - 0)) / 4)

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