Event: Portsmouth Club Championship

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Opponent	Rating	Result
D Wenman	0	1 - 0
Itmam Ekram	0	0 - 1
Liam Rowe	1570	0 - 1

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

390 = (1570 + 400 * (1 - 2)) / 3)