Author: Tord Romstad
Date: 04:10:45 02/06/04
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On February 06, 2004 at 03:42:42, Uri Blass wrote: >On February 06, 2004 at 02:15:35, Tord Romstad wrote: > >>On February 05, 2004 at 15:15:47, Uri Blass wrote: >> >>>I think that you underestimate your engine. >>>It seems to get similiar depth to crafty. >>> >>>For example in the following position it got depth 11 even in blitz 4+2 >> >>Yes, 11 plies in blitz games is not unusual. But 11 plies in Gothmog and 11 >>plies in Crafty is not the same. I do much more forward pruning and depth >>reductions than Bob, and fewer extensions. In non-tactical positions like >>the one you give, my qsearch is also considerably smaller than Bob's (I think). >> > >I do not think that there is a big difference. >Crafty searches bigger tree because it searches more irrelevant lines. > >I guess that the main advantage of Crafty relative to Gothmog when you use one >processor is superior evaluation(Gothmog's evaluation is more complex but bigger >is not always better and not having bugs or some too optimistic scores of >gothmog that lead to wrong sacrifices can be more important and it is possible >that Gothmog can get crafty level if you only reduce the big positional scores >that encourage it to sacrifice). This could all be true, but I think it is beside the point. A slow engine like mine cannot rely on the search to sort things out to the same degree as Crafty does. Some eval terms which Bob has found to be unnecessary or even counter-productive in Crafty are very important in Gothmog (and in other similarly slow engines, I guess). Apparently mobility is one of these terms. >I do not think that gothmog see less than crafty in the relevant lines(crafty >has bigger tree but it proves nothing). >I know that test suites are no proof but results of the gcp test suite give me >the impression that cases when Gothmog can see more than crafty are not rare. The picture is a bit more complicated, I think. Gothmog is just better than Crafty at finding simple tactics extremely fast. When we compared ECMGCP results some time ago, Dann made the observation that Gothmog found many more solutions than Crafty in one second, but that there wasn't a big difference in solutions found in ten seconds. Given enough time, Crafty is at least as strong in tactics as Gothmog. Tord
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