Search found 91 matches

by koedem
Sun Feb 02, 2020 3:28 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Dense board representation as hash code
Replies: 8
Views: 1918

Re: Dense board representation as hash code

After some sleep I realize I wrote a bunch of nonsense. :D 2^188 < 768 choose 32 < 2^189, gives a lower bound for 189 Bits. should be correct though I think. Simply by starting from an empty board, all possible positions are a subset of all 32 key combinations. (plus less pieces but that should be n...
by koedem
Sat Feb 01, 2020 5:16 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Dense board representation as hash code
Replies: 8
Views: 1918

Re: Dense board representation as hash code

Unfortunately Hufman encoding cannot be updated incrementally in an efficient way. A Zobrist approach with a very long key is much more practical. Human encoding of a position with all pieces present would take 32*1+16*3+12*5+4*6 = 164 bits (where castling rights can be kludged in by representing v...
by koedem
Sat Feb 01, 2020 2:08 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: hash collisions
Replies: 370
Views: 28921

Re: hash collisions

This made me think, what if you use a collision free board hashing + lockless hashing to possibly (?) get rid of these problems. Here's some thoughts on that http://talkchess.com/forum3/viewtopic.php?f=7&t=72964 I don't think this gains Elo but it might at least be interesting to think about and/or ...
by koedem
Sat Feb 01, 2020 2:05 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Dense board representation as hash code
Replies: 8
Views: 1918

Dense board representation as hash code

So I was wondering how expensive it would be to get a collision free hash code for positions so that in search one doesn't have to worry about collisions as well as it possibly helping for perfting where a hash collision really makes a difference. It's trivial to get 256 Bits and user Pio had the ni...
by koedem
Tue Jan 28, 2020 5:03 am
Forum: Computer Chess Club: Tournaments and Matches
Topic: mmt Vs. Ovyron (G4 D5 BG2)
Replies: 662
Views: 46367

Re: mmt Vs. Ovyron (G4 D5 BG2)

If you're looking to run very long searches, the standard Leela binary will not be very useful since AFAIK they haven't changed the data type of their Q. (at least last time I checked Q was a float which means that for long searches (> 100MN) the eval and with it the search will become stuck due to...
by koedem
Sun Jan 26, 2020 8:07 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: mmt Vs. Ovyron (G4 D5 BG2)
Replies: 662
Views: 46367

Re: mmt Vs. Ovyron (G4 D5 BG2)

Which network will Lc0 be using? Default or specialized settings? Also, what endgame tables will be available to your engines? Sergio 384x30-t40-1808 with specialized settings: in-between default and "Kiudee." If you have any suggestions about settings, please let me know. I have 6-men tablebases b...
by koedem
Sun Jan 26, 2020 6:16 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Why is MultiPV so slow?
Replies: 25
Views: 3668

Re: Why is MultiPV so slow?

I haven't implemented multi PV in my engine so I might be completely wrong but couldn't one reason why it is so slow be that the TT gets trashed from all the different bounds? In single PV mode if the eval is somewhat stable all bounds for all positions will be around that eval, either as upper or l...
by koedem
Fri Jan 17, 2020 12:53 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: Swiss Tournament Edition IX. Group E.
Replies: 34
Views: 3159

Re: Swiss Tournament Edition IX. Group E.

I had planned to send this version of my engine to CCRL testing but after this disastrous tournament I may have to write a few improvements first. :D
by koedem
Sat Jan 11, 2020 3:38 am
Forum: Computer Chess Club: Tournaments and Matches
Topic: Swiss Tournament Edition IX. Group E.
Replies: 34
Views: 3159

Re: Swiss Tournament Edition IX. Group E.

Sergio Martinez wrote:
Fri Jan 10, 2020 9:52 pm
koedem wrote:
Fri Jan 10, 2020 1:59 pm
Should one be able see live games? I can just see an empty chess board when following the link.
Yes, it is exactly Alexander says. :wink:
Strange, I kept checking every few hours but never saw anything.
by koedem
Fri Jan 10, 2020 1:59 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: Swiss Tournament Edition IX. Group E.
Replies: 34
Views: 3159

Re: Swiss Tournament Edition IX. Group E.

Should one be able see live games? I can just see an empty chess board when following the link. Also seems like for my engine nothing changed, still getting good positions and blowing them. :D I wonder if in this field where my engine is weakest it might be a good idea to set a high draw score, that...