Author: Anson T J
Date: 13:12:38 07/12/02
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Simple :) If an engine *never* changes it mind with more time above a certain time limit (A), it *can't* play any stronger than how it would have played had the search process been interrupted at time (A). For an engine to be stronger, it *must* show some difference in move selection (especially if the engine lost this particular game) otherwise, it would play the same as before and lose in the same manner. It is indeed true that the engine's new selection could be worse and could make the engine play weaker. But, what remains true is that a difference in move selection must be presence for there to be any difference in strength. Ed isn't saying that a change of best move found makes the engine (on faster hardware) stronger, but the lack of move change shows the engine isn't improving (or playing weaker).
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