Event: Silver Rook

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Opponent	Rating	Result
Steve DG Huxley	1745	½ - ½
Thomas Legood	1641	0 - 1
Anthony Ryland	1504	½ - ½

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

1497 = (4890 + 400 * (0 - 1)) / 3)