The relationship between the evaluation value and the winning percentage is expressed by the following formula. It is an ordinary sigmoid function. r: Win rate x: Evaluation value a: Constant. The larger a is, the steeper the change in the winning percentage per evaluation value. It seems that a = 1/600 is often used in Shogi AI. In the USI protocol, it seems that the value of one step is expressed as an evaluation value of 100 points. When a = 1/600, it seems that one step will be 100 points.
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