Search found 654 matches

by Joerg Oster
Fri Jun 14, 2019 9:57 am
Forum: Computer Chess Club: General Topics
Topic: Pre-Release McCain X4
Replies: 22
Views: 1102

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: 86
Views: 2630

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: 4039

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: 598

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: 1204

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: 1204

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: 1204

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: 230

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: 549

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...
by Joerg Oster
Wed May 08, 2019 8:08 pm
Forum: Computer Chess Club: General Topics
Topic: A tough nut to crack
Replies: 5
Views: 549

Re: A tough nut to crack

To fully resolve this mate in 89 moves would require to search 177 plies deep at minimum!
Stockfish's maximum search depth is 127 plies.

You have to find an engine which can search deep enough.