Search found 52 matches

by Branko Radovanovic
Wed Mar 06, 2019 12:56 pm
Forum: Computer Chess Club: General Topics
Topic: Lc0 GPU load
Replies: 17
Views: 1344

Re: Lc0 GPU load

If I try to host the GPU out of the box using a raiser card adopter something like shown below, will it affect the performance? The idea is to give the gpu more cooler air to breath & to cool down. Additional case fans may be a better solution. It is basically the same idea: help the GPU fan by not...
by Branko Radovanovic
Thu Feb 14, 2019 5:01 pm
Forum: Computer Chess Club: General Topics
Topic: Knight equals 48 pawns?
Replies: 47
Views: 4695

Re: Knight equals 48 pawns?

I downloaded the latest Lc0 about a week ago on my laptop (with GPU 1060), and looked at its analysis (infinite mode) on lots of positions. Typically, in the opening evals are roughly double what they should be; in general a clean pawn up shows as about two pawns. However, the initial position with...
by Branko Radovanovic
Tue Jan 22, 2019 12:49 pm
Forum: Computer Chess Club: General Topics
Topic: Schizophrenic rating model for Leela
Replies: 27
Views: 3587

Re: Schizophrenic rating model for Leela

Transitivity is pretty well obeyed by regular engines, I even came to pretty conclusive results that on large Elo spans it obeys the logistic and not Gaussian distribution. Some 2-3 years ago this was unclear to me. I am not sure what you mean by "ratings in engine-to-engine Elo lists get compresse...
by Branko Radovanovic
Mon Jan 21, 2019 3:27 pm
Forum: Computer Chess Club: General Topics
Topic: Schizophrenic rating model for Leela
Replies: 27
Views: 3587

Re: Schizophrenic rating model for Leela

I was hoping someone would come up with an alternative, two-parameter Elo model able to describe Leela's performance... But, aren't all engines schizophrenic to a degree? :-) We already know that engine-to-engine games expose a weakness of the Elo model - namely, it assumes a fixed transitivity form...
by Branko Radovanovic
Sat Nov 17, 2018 8:01 pm
Forum: Computer Chess Club: General Topics
Topic: what happened to scorpio NN in TCEC?
Replies: 33
Views: 3210

Re: what happened to scorpio NN in TCEC?

Suppose TCEC had a rule that after the tournament is finished, each engine is awarded random bonus points. For all engines the bonus points are drawn from the same random distribution, so this is absolutely and completely fair. But clearly this would just add noise to the tournament results, distor...
by Branko Radovanovic
Sat Nov 17, 2018 7:19 pm
Forum: Computer Chess Club: General Topics
Topic: what happened to scorpio NN in TCEC?
Replies: 33
Views: 3210

Re: what happened to scorpio NN in TCEC?

The inclusion of games of a randomly crashing engine clearly hurts fairness. How can one hurt fairness by including non-crashing games of a crashing engine? On the contrary, it is their removal that hurts fairness. If it's unfair for an engine to receive a point just because its opponent crashed, i...
by Branko Radovanovic
Sat Nov 17, 2018 5:27 pm
Forum: Computer Chess Club: General Topics
Topic: what happened to scorpio NN in TCEC?
Replies: 33
Views: 3210

Re: what happened to scorpio NN in TCEC?

Imagine a Stockfish version with a particularly nasty bug that causes it to crash after capturing a knight on f4. This scenario will occur infrequently, but will cause SF to lose the game on the spot. A tournament in which this happens in, say 6 games out of 30, will lead to a distorted view of the...
by Branko Radovanovic
Sat Nov 17, 2018 4:09 pm
Forum: Computer Chess Club: General Topics
Topic: what happened to scorpio NN in TCEC?
Replies: 33
Views: 3210

Re: what happened to scorpio NN in TCEC?

Meanwhile, the entire Div4 has been restarted, without Scorpio. The chat message is: hi everyone i am sorry to inform you Entrance Division 4 had to be restarted due to too many inconsistencies in book orders, probably as a consequence of the many crashes among other things. this seemed to be the on...
by Branko Radovanovic
Tue Oct 23, 2018 6:06 pm
Forum: Computer Chess Club: General Topics
Topic: What was the top Chess engine before it was Stockfish, Komodo or Houdini?
Replies: 58
Views: 5845

Re: What was the top Chess engine before it was Stockfish, Komodo or Houdini?

The last time the strongest chess engine was not Stockfish, Komodo, or Houdini was in December 2010, right before Houdini 1.5 was released. At that time, Rybka 4 was #1. The last archived version of CCRL 40/40 with Rybka as #1: https://web.archive.org/web/20101121055257/http://computerchess.org.uk/c...
by Branko Radovanovic
Wed Sep 26, 2018 12:09 pm
Forum: Computer Chess Club: General Topics
Topic: Leela doesn't obey well the Elo curve set by regular engines
Replies: 9
Views: 4123

Re: Leela doesn't obey well the Elo curve set by regular engines

This is very interesting and may at first appear difficult to explain. However, consider an engine that randomly crashes in e.g. 20% of the games. Elo-wise, this would create the same phenomenon: such an engine would always lose at least 20% of the games, even against the weakest of opponents, and i...