Event: Winter Rapid

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Opponent	Rating	Result
Liam Parsons	1345	0 - 1
Luke Fisher	1310	0 - 1
Roger Bray	1312	1 - 0

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

1189 = (3967 + 400 * (1 - 2)) / 3)