Event: 4th Simon Bartlett Memorial Major

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Opponent	Rating	Result
Simon D Arnold	1922	½ - ½
Roger D de Coverly	1984	1 - 0
Joseph J Skielnik	1910	½ - ½
Martin J Cutmore	1943	0 - 1

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

1940 = (7759 + 400 * (1 - 1)) / 4)