Event: David Jenkins Memorial Cup

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Opponent	Rating	Result
Ajna Fern	1488	1 - 0
David Pemberton	1768	1 - 0
Ian M George	1882	1 - 0
Clive Rothery	1807	1 - 0
John DM Nunn	2561	0 - 1

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

2141 = (9506 + 400 * (4 - 1)) / 5)