Author: Ed Schröder
Date: 08:00:37 09/01/01
Go up one level in this thread
On September 01, 2001 at 09:55:25, Robert Hyatt wrote: >On September 01, 2001 at 08:48:00, Vincent Diepeveen wrote: > >> >>You are entirely right Ed, i have singular extensions inside diep now >>and play with them turned on tournaments now. first tournament i played >>with them turned on was back in 1994 the dutch open championship, >>but my implementation sucked bigtime there. Then in paderborn 2001 i >>used a better implementation with big reduction factor (R=3) and >>also in combination with other extensions. The reason i have them >>inside diep now is >> a) diep doesn't search very deeply so overhead isn't too big then >> b) to solve testpositions quicker otherwise i need days to solve things >> >>However what i notice is that in mainlines in complex positions the >>value of singular extensions is very limited. Of course if i'm already >>won i see mates way before my opponent sees them (in middlegame) or >>i see a win way before my opponent sees it, as well as that Rxf7 move >>which ferret played against gandalf i see within seconds with within 90 >>seconds the right score, but after all the only impact of singular extensions >>is that they give a psychological good feeling "i'm not going to lose >>because of a cheap trick if my program messes up". Of course combinations >>can only be there and getting outsearched is only important if a program >>plays completely anti positional chess. >> >>In normal game play and in sound positions, there the value of SE and similar >>extensions gets hugely overrated i think. > > >I don't believe they _hurt_ when done right. The _last_ report by the DB >team suggested that SE was worth maybe 10-20 Elo rating points at most. Their >first report suggested far greater improvement, but this was because it did far >better on test suites. In matches, it won, but the margin of victory was much >less than the test suite results suggested... > >My tests in CB produced the same results. Modest improvements in games, some- >times wild improvements in test positions. But even though the improvement in >games is very modest, that one game here or there is _still_ very important. >That could be your game vs Kramnik in a big tournament, for example. Then why is SE not in Crafty when SE is an improvement? Ed
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