Event: Portsmouth Club Championship

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Opponent	Rating	Result
Harit Bhatt	0	0 - 1
Liam Rowe	1570	0 - 1
Paul Barker	1417	½ - ½

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

729 = (2987 + 400 * (0 - 2)) / 3)