Author: Graham Laight
Date: 08:33:55 04/08/98
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This is very interesting commentary. But doesn't a program like hiarcs have the same effect on its aggressive setting? On April 07, 1998 at 23:01:40, Fernando Villegas wrote: > >After my last game against CTAL -white.exe version-, when I was trying >to hold all together -I did not make it- against an untiring attack, I >have had something like a revelation about how this program maybe works >and the reason of, at the same time, his proficiency against average, >experienced, expert an even Fide master class players and at the same >time his “weakness” against the very top programs in terms of SSDF >ratings. >My impression was and is this: that CSTAL not only make good use of a >far great knowledge code than other programs, but besides, and maybe >more important, it makes use of a search technique very different to the >well known Maximin kind of search, where in each node the program pick >up the moves that gives the lower rating -or the less high- to his >rival. >It’s my impression that CSTAL uses a search technique where the purpose >is, inside certain limits, to get moves that produces maximal pressure >for the adversary and not the minimal score for his best available move. > That “maximal pressure” would be equal to get a maximal number of >threats and dangers for the rival even at the cost, some times, to let >one or more candidate moves that, if picked up, surpass the maximin >standard approach. >The presupposition that Chris W probably did was a very obvious one: >humans are not, inside the tactical horizon of the game, so precise and >almost perfect as programs are to select ever the best move to hold back >a threat in tactical terms; on the contrary, they get tired, lose >concentration, lose nerve and lastly, after doing well under many >attacks, commit the last, fatal mistake. >My experience with CSTAL is precisely that: he launch an attack after >another with the idea that sooner or later, under pressure, you are >going to choose one of the moves that maximizes his advantage and not >the move that gives you a best chance, even if theroretically exist. In >fact, is not that what happens in normal game between humans? How many >times a human game goes trough and trough the best moves for each side? >For the same reason CSTAL does not so good against computers, that does >not get trired and calculate everything inside a normal horizon of let >us say 7 to 12 ply. >Am I mistaken? If some programmer is there to show the Light.... >Fernando
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