Search found 223 matches

by jorose
Wed Jun 19, 2019 3:00 am
Forum: Computer Chess Club: Tournaments and Matches
Topic: The Curved Web 4CPU
Replies: 9
Views: 206

Re: The Curved Web 4CPU

Oooff, that Asymptote win was brilliant and brutal.
by jorose
Mon Jun 17, 2019 3:25 pm
Forum: Computer Chess Club: General Topics
Topic: ChessBase's prophecy of 2004 fulfilled in 2019
Replies: 13
Views: 775

Re: ChessBase's prophecy of 2004 fulfilled in 2019

Seems like a fun experiment. I do sometimes wonder how people would react if we teleported modern engines back in time. Potentially even further back, though before the 2000s you might have to send hardware back as well. Especially since people of the passed would have no idea how to actually play a...
by jorose
Sun Jun 16, 2019 4:20 am
Forum: Computer Chess Club: General Topics
Topic: Question for Nelson Hernandez - TCEC power consumption
Replies: 13
Views: 955

Re: Question for Nelson Hernandez - TCEC power consumption

The power draw from the TCEC GPU machine will almost certainly be higher than from the CPU machine, but I don't know by how much exactly.

Are you asking out of general curiosity or is there something specific you are interested in?
by jorose
Mon Jun 10, 2019 9:13 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: SPCC: Testrun of Stockfish 190531 finished
Replies: 6
Views: 390

Re: SPCC: Testrun of Stockfish 190531 finished

Raphexon wrote:
Sun Jun 09, 2019 1:21 pm
And a big shame that SF doesn't seem to be progressing.
While single core progress hasn't been quite at the insane speed it has had in the passed, the arguably more important progress on 8 cores has been roughly 30 Elo over 6 months. That is fantastic progress if you ask me.
by jorose
Mon Jun 10, 2019 4:32 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: Leela Chess Zero 42518 vs Stockfish 100619
Replies: 6
Views: 236

Re: Leela Chess Zero 42518 vs Stockfish 100619

I don't think you will actually be able to judge the effect it is having without a reasonably large sample size. Even if Leela has a reasonably low overhead in terms of CPU usage the effect on cache is harder to measure. It's also unclear what you would compare the performance to, perhaps one engine...
by jorose
Mon Jun 10, 2019 3:52 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: is LVA as in MVV-LVA useless ?
Replies: 9
Views: 588

Re: is LVA as in MVV-LVA useless ?

I recently tried using my full blown move ordering (just without SEE) in QSearch, but it scored something like -8.5 +- 6 at the end of my test. I would imagine the reason was simply how expensive the calculation is. I am currently intending to train a set of weights on only root QS (as in the first ...
by jorose
Mon Jun 10, 2019 3:31 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: Leela Chess Zero 42518 vs Stockfish 100619
Replies: 6
Views: 236

Re: Leela Chess Zero 42518 vs Stockfish 100619

Considering SF play on CPU and Lz0 on GPU. It probably make sense to play with permanent brain turned on. I tried on my system couple of days ago. As long as one core is left for the OS and 1-2 core for Lz0. Have you tried this? He only has 16 physical cores so how many threads would you give Leela...
by jorose
Sat Jun 08, 2019 3:45 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Is this hard ?
Replies: 12
Views: 440

Re: Is this hard ?

Somehow Winter has one of the two correct moves for all depths, but Im not sure at what point Winter really understood it. position fen 4B3/4kP2/8/6P1/6KP/8/8/5r2 w - - 1 67 go infinite info depth 1 seldepth 2 time 0 nodes 18 nps 18000 score cp 176 pv h4h5 info depth 2 seldepth 4 time 0 nodes 88 nps...
by jorose
Fri Jun 07, 2019 5:23 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Using evaluation hash score as current bestscore (initial guess)
Replies: 13
Views: 599

Re: Using evaluation hash score as current bestscore (initial guess)

I think it is clear the adjusted value could technically utilize tighter bounds. How much tighter depends on the information gained from hash. On the other hand, a position found in your hash may be a more difficult one on average, so perhaps less tight bounds would be better after all. Most likely ...
by jorose
Thu Jun 06, 2019 9:25 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Using evaluation hash score as current bestscore (initial guess)
Replies: 13
Views: 599

Re: Using evaluation hash score as current bestscore (initial guess)

If I read Xiphos code correctly then the bestscore there is just the current best score estimate for the purposes of things like futility pruning. The value gets reset before the move loop is reached. In an ideal world the static score would be equivalent to the true outcome of the game. Instead we ...