Event: Division 4

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Opponent Rating Result
Philip Sykes 1562 1 - 0
Philip Sykes 1562 0 - 1
Ian Boddington 1331 1 - 0
Giorgio Kelly 1025 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1570 = (5480 + 400 * (3 - 1)) / 4)

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