Search found 655 matches

by Joerg Oster
Wed Jul 03, 2019 8:01 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: DTM50
Replies: 65
Views: 6719

Re: DTM50

I use Nalimov 6-men on the old Samsung 970 EVO 2TB, with my own engine it is fast enough to probe at depth 1 without causing too much slowdown. A few years back I generated 6-men syzygy WDL and DTZ which took 5 days on my old 5960x, however I never came to use it. I still want to try to combine syz...
by Joerg Oster
Fri Jun 14, 2019 9:57 am
Forum: Computer Chess Club: General Topics
Topic: Pre-Release McCain X4
Replies: 22
Views: 1716

Re: Pre-Release McCain X4

Probably needs an aligned allocation. Objects can be different sizes because of the OS and compiler. For instance, with GCC on a 64 bit Linux, long is 8 bytes but on 64 bit windows it is 4 bytes. I didn't even look at the code yet so this is a guess. Strange that an assert was used since it sounds ...
by Joerg Oster
Mon Jun 10, 2019 8:27 am
Forum: Computer Chess Club: General Topics
Topic: OKE - Opening Knowledge Engines
Replies: 94
Views: 5601

Re: OKE - Opening Knowledge Engines

Interesting.
It looks like there is a LOT of room for improvement, in general.
by Joerg Oster
Fri Jun 07, 2019 8:48 am
Forum: Computer Chess Club: General Topics
Topic: Honey-XPro Release
Replies: 59
Views: 6879

Re: Honey-XPro Release

An undocumented feature that you can also combine tactical and multipv - say you want a wider search tactical to 3 ( search as if multipv was set to 8) and you set multipv to see just the best 4 best moves , although it is doing wider searches if was multipv was searched to 8, it will just display ...
by Joerg Oster
Tue Jun 04, 2019 8:48 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: is LVA as in MVV-LVA useless ?
Replies: 9
Views: 1025

Re: is LVA as in MVV-LVA useless ?

I don't see any reason why Stockfish prefers MVV over MVV-LVA, they talk about code complexity but to me it seems that one additional subtraction is not very complex at all, probably it tested 0.1 Elo better. Exactly, LVA serves a sole purpose to resolve ties. A couple of instructions and 70k games...
by Joerg Oster
Tue Jun 04, 2019 9:10 am
Forum: Computer Chess Club: General Topics
Topic: Stockfish and Multi-PV
Replies: 24
Views: 2317

Re: Stockfish and Multi-PV

I am disappointed, I was wondering if it made sense SF could build an opening book by itself using Multi-PV. First results (analysis time 100ms) looked promising 48.3% against the ProDeo book, 49.4% (analysis time 1000ms), now trying 2000ms but I think I am wasting my time looking at the moves it s...
by Joerg Oster
Mon Jun 03, 2019 2:22 pm
Forum: Computer Chess Club: General Topics
Topic: Stockfish and Multi-PV
Replies: 24
Views: 2317

Re: Stockfish and Multi-PV

I am disappointed, I was wondering if it made sense SF could build an opening book by itself using Multi-PV. First results (analysis time 100ms) looked promising 48.3% against the ProDeo book, 49.4% (analysis time 1000ms), now trying 2000ms but I think I am wasting my time looking at the moves it s...
by Joerg Oster
Mon Jun 03, 2019 8:56 am
Forum: Computer Chess Club: General Topics
Topic: Stockfish and Multi-PV
Replies: 24
Views: 2317

Re: Stockfish and Multi-PV

sf-multi-pv.jpghttp://talkchess.com/forum3/download/file.php?mode=view&id=557&sid=7aba7a842a1f513c9b9e21856ed59329 This is Stockfish Multi-pv=3 after 1.e4 c5 2.Nf3 Nc6 It's hard to believe that at depth 18 : #1. d4 is nowhere in sight; #2. h3? is the third best move. Have seen other strange mov...
by Joerg Oster
Fri May 10, 2019 9:08 pm
Forum: Computer Chess Club: General Topics
Topic: Nd4 draws, all other moves lose
Replies: 1
Views: 307

Re: Nd4 draws, all other moves lose

An experimental version of a SF-Mod, at a very early stage, trying to mimic a MCTS-like search, with 3 Threads, 1 GB Hash, 6p syzygy's: info depth 30 seldepth 34 multipv 1 score cp 0 nodes 345553391 nps 3067223 hashfull 976 tbhits 3201076 time 112660 pv e2d4 f1d2 c4b5 e3d4 d5d6 d1a4 b5a4 d2c4 a4b5 c...
by Joerg Oster
Thu May 09, 2019 8:09 am
Forum: Computer Chess Club: General Topics
Topic: A tough nut to crack
Replies: 5
Views: 642

Re: A tough nut to crack

I changed MAX_PLY to 256 in types.h. Rest is latest Stockfish. This change puts a strain on the stack I suppose but it compiles fine and no crash in bench. With your machine it probably is easier to check the whole solution backwards with Joerg's idea and a lot of hash. Maybe counts as a simplifica...