Event: Silver Rook

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Opponent Rating Result
Ian Haley 1666 0 - 1
Oliver Tatlow 1524 1 - 0
Tim Pryke 1381 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1657 = (4571 + 400 * (2 - 1)) / 3)

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