Event: Silver Rook

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Opponent Rating Result
Stephen Burton 1408 1 - 0
Oliver Tatlow 1543 ½ - ½
David Firth 0 0 - 1
Christopher Lund 1656 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1052 = (4607 + 400 * (1 - 2)) / 4)

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