Event: Derbyshire Individual

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Opponent	Rating	Result
Paul Madden	190	½ - ½
David Smith	153	1 - 0
Andrew Toothill	162	0 - 1
Stephen Lamont	143	1 - 0
Alex Webster	163	0 - 1

performance = (sum(opponents ratings) + 400(wins-losses)) / games

162 = (811 + 400 * (2 - 2)) / 5)