Author: Uri Blass
Date: 10:47:45 05/04/01
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On May 04, 2001 at 13:26:35, Chris King wrote: >Although there is a huge difference between blitz chess and normal chess for >humans isn't it true that for computer programs, that don't fell pressure, the >only difference is the depth of search. After all programs are analysing >millions of positions per move even at blitz chess on today's computers. So >engine v engine results played at blitz should only reflect results played at >longer time controls. I have often seen it stated that certain engines play >better at longer time controls, but is this really so. I have also seen it >stated that at longer time controls an engine has more time to formulate a plan. >If this were true the nodes per second count would significantly reduce as an >engine looked deeper into a position and made it's more sophisticated plan. I >have never noticed such a reduction in nodes per second and isn't it true that a >computer program doesn't make plans in any human sense. I read that tiger makes plan but I guess that making the plan takes a very small time so you cannot see reduction in nodes per second because of the plan. I guess that it is using the root position to decide about some targets and changes the evaluation function based on these targets. I have no reason to believe that this help tiger more at longer time control and the data that I read suggests that Deep Fritz earns more than Tiger from time(Tiger is clearly better at blitz when it is not clear if tiger is better than Deep Fritz at tournament time control) >You can play far more engine v engine games at blitz which gives a statistically >more accurate measurement of the relative strength of each engine, or am I >missing something glaringly obvious here. Yes You are missing something. Programs have different evaluation function and different search rules. The best evaluation function for blitz is not the best evaluation function for long time control. The best search rules for blitz are not the best search rules for long time control. Uri
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