Search found 6401 matches

by Uri Blass
Fri May 10, 2019 2:57 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Searching crazy positions
Replies: 11
Views: 958

Re: Searching crazy positions

This is entering the realm of vagueness. We humans can see these positions as being sort of ridiculous. A computer cannot see. A computer can only calculate within the search tree. How did it arrive at these positions. What was the first ridiculous move? If there was an easy way to forward prune th...
by Uri Blass
Wed May 08, 2019 9:45 am
Forum: Computer Chess Club: General Topics
Topic: Komodo 13 released
Replies: 85
Views: 11071

Re: Komodo 13 released

I wonder why CCRL do not include Komodo MCTS as a version of Komodo in their comparison https://ccrl.chessdom.com/ccrl/4040/cgi/engine_details.cgi?print=Details&each_game=1&eng=Komodo%2011.3.1%2064-bit%204CPU#Komodo_11_3_1_64-bit_4CPU There are 61 versions of Komodo but no version is Komodo MCTS Loo...
by Uri Blass
Fri May 03, 2019 6:47 pm
Forum: Computer Chess Club: General Topics
Topic: My take on the whole "End of an era" thing.
Replies: 45
Views: 2459

Re: My take on the whole "End of an era" thing.

selecting the random positions is easy You take a big data of pgn and translate it to some epd file and choose random positions from the file. I agree that computer resources is a problem. I meant you have to decide which random positions go in the file. I agree once you've decided on the total set...
by Uri Blass
Fri May 03, 2019 2:20 pm
Forum: Computer Chess Club: General Topics
Topic: Why all Lc0 runs result in such similarity of quiet moves selection?
Replies: 21
Views: 1961

Re: Why all Lc0 runs result in such similarity of quiet moves selection?

A position has a unique best move only if there is only one winning move or only one move to save the game. It means that the position is not quiet based on my understanding. Sure, "quiet" or having multiple possible almost equivalent moves according to say Stockfish. It still might have a unique b...
by Uri Blass
Fri May 03, 2019 5:10 am
Forum: Computer Chess Club: General Topics
Topic: My take on the whole "End of an era" thing.
Replies: 45
Views: 2459

Re: My take on the whole "End of an era" thing.

I suggest the following game to train about that is not exactly chess because of different scoring rules and the fact that you have probability of 50% not to start from the opening position. In every game you start from the opening position with probability of 50% and from random position from a bi...
by Uri Blass
Fri May 03, 2019 5:02 am
Forum: Computer Chess Club: General Topics
Topic: Why all Lc0 runs result in such similarity of quiet moves selection?
Replies: 21
Views: 1961

Re: Why all Lc0 runs result in such similarity of quiet moves selection?

VERY interesting. "SF dev Strong", that is, SF_dev on 4 cores at 500ms/position compared to SF_dev on 1 core at 100ms/position is SIGNIFICANTLY closer to Lc0 late nets of each run 10xxx, 30xxx, 35xxx, 40xxx, by a pretty hefty margin of about 3.5% of matched moves in quiet positions. The matrix is h...
by Uri Blass
Thu May 02, 2019 3:39 am
Forum: Computer Chess Club: General Topics
Topic: My take on the whole "End of an era" thing.
Replies: 45
Views: 2459

Re: My take on the whole "End of an era" thing.

More important is that the NN-based engines aren't really very good at Chess in general: they seem to be quite inferior for analyzing arbitrary positions. The one thing they are good at is playing games from the opening position, because that allows them to avoid the large fraction of positions whe...
by Uri Blass
Tue Apr 23, 2019 7:01 pm
Forum: Computer Chess Club: General Topics
Topic: New results in the ERET chess test
Replies: 11
Views: 1131

Re: New results in the ERET chess test

Fire 7.1 behind Critter, Laser, Fizbo, Booot, Andscacs, Xiphos, Sting, Deep Shredder and Ethereal? Critter 1.6 better than Fritz, Equinox and Gull? Deep Shredder 13 better than Xiphos? And so on ... Looks like a lottery. Not to me. The probability of an engine that is 200 elo better to be in a bett...
by Uri Blass
Sat Apr 20, 2019 9:07 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: No standard specification for Perft
Replies: 22
Views: 2933

Re: No standard specification for Perft

If you want perft to be a representative measure of the speed of an engine it should indeed focus more on capture-only generation. Perthaps it would be useful to define a function perft(N, M) which does N ply of full-width search followed by M ply of captures only. Most people use perft only for te...
by Uri Blass
Thu Apr 18, 2019 4:03 am
Forum: Computer Chess Club: General Topics
Topic: The problem with adjudication based on score
Replies: 26
Views: 4431

Re: The problem with adjudication based on score

While I agree with you these situations are very rare and works both ways. Adjudication massively speeds up the process of testing, and if only 1% of the games produce wrong results it's still worth to adjudicate. Speed vs accuracy. I agree with your point that these situations are so rare that it'...