Event: NSDCA Division 3

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Opponent Rating Result
Karol Grzybowski 1774 0 - 1
Sandra G Blackburn 1536 0 - 1
Nigel Gardner 1558 0 - 1
Charlie G Swinson 1448 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1379 = (6316 + 400 * (1 - 3)) / 4)

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