Event: Open County Championship

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Opponent	Rating	Result
Vivash Samarakoon	2108	½ - ½
Michael T Botteley	1968	1 - 0
Norman A Hutchinson	2044	0 - 1
Vivash Samarakoon	2108	½ - ½
Stephen C Ledger	2097	0 - 1
Charles Pickard	2180	0 - 1

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

1951 = (12505 + 400 * (1 - 3)) / 6)