I don't actually have your tables with me so my sql probably has lots of syntax errors. But hopefully I will be to get the general idea across. We can compute the list of deciding frame games where player1 won and union it with the list of deciding frame games where player2 won.
As long as we rename the winner's column name to the same string ('player'), the union of these tables should yield a single table marking out the number of times each person won.
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