Author: Ulrich Tuerke
Date: 04:59:34 10/21/03
Go up one level in this thread
On October 20, 2003 at 23:21:24, Will Singleton wrote: >On October 20, 2003 at 22:41:14, Fernando Villegas wrote: > >It seems to me that the new Comet has some problems, and is perhaps weaker than >previous versions. Here's a position, for example: > >[D]6k1/5pp1/2p1p2p/q1Pn4/3QB3/P2R2P1/5P1P/1r4K1 w - - > >White must play Rd1, with a negative score, but Comet plays Kg2, failing to see >the quick loss. You can also play thru the moves, Kg2 Qe1 Kh3, then see than >Comet takes a long time to find f5, which should be easy. > >Comet has previously been a very strong program, certainly stronger than mine. >But now, that's harder to prove, and it's not due to much increase on my part. > >I'd be interested to hear what Uli has to say. Hi Will, in fact, I don't have any doubt that the B.62 is playing stronger than the B.60. It had won a 50-game match against the B.62 with a score above statistical noise. I must admit that this is a rare case; usually version n+1 has quite a problem to beat version n convincingly. :( Nevertheless, the changes compared to B.60 are still small: (a) a bug fix (sign error in eval), (b) a bit of refinements, and (c) avoidance of one of the risky forward cuts at depth=1. I am rather sure, that (c) is the reason for the improvement. But don't expect too much: Ruffian for instance is certainly playing a league above, although Jorge has reported a surprising match result in another thread. BTW, it seems to me that the B.60 has a problem with the above position as well. In fact there is a class of positions where Comet does bloody bad; the reason is that not every check will be extended by the search ( as all other engines seem to do ?). But I'm sure that it doesn't hurt practical play because Comet has a lot of other extensions. In some continous tourneys, Comet had to demote to the next lower league. However, I do not think that 's due to a decreased playing strength as you suggested. It's just the competition of the young guys (like you) which is becoming tougher and tougher. There is now really a lot of amateur engines playing on Comet's level (or even above). So, I guess it's your "fault" making our games become tougher. I am sure that your engine has been progressing much faster than Comet (which is not too difficult, I'm afraid -:) ). Anyway, congrats for this; I'm pretty impressed by the latest developments of the amateurs. (Not long ago, there had been Crafty, then a big gap ... and then others). Greetings, Uli > >Will
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