Board for everybody who is interested in BrainKing itself, its structure, features and future.
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BuilderQ: It is the US Chess Federation formula. However it is modified for BrainKing. For instance if you beat a significantly weaker opponent you gain little or no BKR. If the formula was exactly applied you would lose points in this example. So if you can access the US Chess Federation Formula for calculating a rating number than you can figure it out.