Search found 64 matches

by ymatioun
Thu Dec 21, 2017 11:47 pm
Forum: Computer Chess Club: General Topics
Topic: Fizbo 2 has been released
Replies: 19
Views: 7463

Fizbo 2 has been released

Fizbo 2 has been released, and can be downloaded from https://sites.google.com/site/fizbochessengine/ Here are release notes: 1. minor bug fixes: fixed a bug that occasionally crashed the engine, mostly running on multiple CPU cores. That is the bug that crashed Fizbo twice in TCEC10 . 2. minor chan...
by ymatioun
Mon Oct 16, 2017 9:50 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Tapered Eval between 4 phases
Replies: 7
Views: 1920

Re: Tapered Eval between 4 phases

I tried this earlier this year; i tried using 4 stages, 8 stages and even 16 stages (you can fit 16 16-bit values into one AVX variable that you can operate on in one instruction, so up to 16 stages can be accommodated with virtually no performance penalty). This significantly reduces variance of th...
by ymatioun
Sat Apr 22, 2017 12:18 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Sorting algorithms
Replies: 61
Views: 13803

Re: Sorting algorithms

i use insertion sort - for short, partially sorted lists it is fast, with O(N) performance in best case. I tried using selection sort instead at some point, and saw worse performance.
by ymatioun
Sat Mar 18, 2017 11:43 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: On-line engine blitz tourney March
Replies: 17
Views: 3191

Re: On-line engine blitz tourney March

US already switched to summer time, so now 9pm in Amsterdam is 4pm (not 3pm) in Boston.
by ymatioun
Wed Jan 04, 2017 11:02 pm
Forum: Computer Chess Club: General Topics
Topic: Fizbo 1.9 released
Replies: 57
Views: 14776

Re: Fizbo 1.9 released

somebody else had a similar problem, where Fizbo 1.8 was identified as a virus by windows defender (and Fizbo 1.9 reuses most of the code, so may have the same exact problem). I don't know why this happens; my best guess is that a portion of my code accidentally matches a portion of code of some vir...
by ymatioun
Sun Jan 01, 2017 2:52 pm
Forum: Computer Chess Club: General Topics
Topic: Fizbo 1.9 released
Replies: 57
Views: 14776

Re: Fizbo 1.9 released

more on "info string I have a big problem": now i understand why you get this message - you search to a fixed depth, so time parameters are not defined, and it looks like a timeout. I never search to a fixed depth, so i never get this message anymore. So just ignore it, it is informational only and ...
by ymatioun
Sat Dec 31, 2016 10:37 pm
Forum: Computer Chess Club: General Topics
Topic: Fizbo 1.9 released
Replies: 57
Views: 14776

Re: Fizbo 1.9 released

that was fast - thanks!
by ymatioun
Sat Dec 31, 2016 7:21 pm
Forum: Computer Chess Club: General Topics
Topic: Fizbo 1.9 released
Replies: 57
Views: 14776

Re: Fizbo 1.9 released

i put this message for diagnostic purposes (and totally forgot about it). It should be printed in case of timeout, and should not impact anything. So just ignore it, and i will take it out in the next version.

Youri.
by ymatioun
Sat Dec 31, 2016 6:14 pm
Forum: Computer Chess Club: General Topics
Topic: Fizbo 1.9 released
Replies: 57
Views: 14776

Fizbo 1.9 released

Fizbo 1.9 has just been released. It can be downloaded from https://sites.google.com/site/fizbochessengine/ Here are changes from version 1.8: 1. minor bug fixes: Fizbo 1.8 sometimes crashed when using 6-piece syzygy tables; that should not happen any more. 2. minor changes to search. 3. extensive c...
by ymatioun
Sat Dec 24, 2016 4:20 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Testing with different EPD suits for search vs eval changes
Replies: 11
Views: 2473

Re: Testing with different EPD suits for search vs eval chan

i absolutely agree: any sort of test suites are not good enough to measure small to medium changes. The only reliable way is through extensive game play. Yes, that takes a lot of time, but there really is no alternative to it.