Event: Hepolite (Rapidplay)

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Opponent	Rating	Result
Mick Overend	1286	0 - 1
Mick Overend	1286	1 - 0
Derrick J Mason	1427	1 - 0
Derrick J Mason	1427	½ - ½

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

1457 = (5426 + 400 * (2 - 1)) / 4)