Event: D&DCL Cup QP

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Opponent	Rating	Result
Martin Cobham	1729	0 - 1
D Martin Howard	1712	½ - ½
Norman J Davies	1671	1 - 0
Derek A Jarvis	2013	0 - 1

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

1681 = (7125 + 400 * (1 - 2)) / 4)