Event: Silver Rook

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Opponent	Rating	Result
Jim R Postill	105	0 - 1
Tim Pryke	90	0 - 1
Paul R Chambers	43	1 - 0
Werner Rieser	91	½ - ½
Oliver Dickinson	0	½ - ½

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

-14 = (329 + 400 * (1 - 2)) / 5)