Search found 91 matches
- 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: 2369
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...
- 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: 2369
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...
- Sat Feb 01, 2020 2:08 am
- Forum: Computer Chess Club: Programming and Technical Discussions
- Topic: hash collisions
- Replies: 370
- Views: 56716
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 ...
- 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: 2369
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...
- Tue Jan 28, 2020 5:03 am
- Forum: Computer Chess Club: Tournaments and Matches
- Topic: mmt Vs. Ovyron (G4 D5 BG2)
- Replies: 662
- Views: 58610
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...
- Sun Jan 26, 2020 8:07 pm
- Forum: Computer Chess Club: Tournaments and Matches
- Topic: mmt Vs. Ovyron (G4 D5 BG2)
- Replies: 662
- Views: 58610
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...
- Sun Jan 26, 2020 6:16 am
- Forum: Computer Chess Club: Programming and Technical Discussions
- Topic: Why is MultiPV so slow?
- Replies: 25
- Views: 5043
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...
- Fri Jan 17, 2020 12:53 pm
- Forum: Computer Chess Club: Tournaments and Matches
- Topic: Swiss Tournament Edition IX. Group E.
- Replies: 34
- Views: 4158
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. 

- Sat Jan 11, 2020 3:38 am
- Forum: Computer Chess Club: Tournaments and Matches
- Topic: Swiss Tournament Edition IX. Group E.
- Replies: 34
- Views: 4158
Re: Swiss Tournament Edition IX. Group E.
Strange, I kept checking every few hours but never saw anything.
- Fri Jan 10, 2020 1:59 pm
- Forum: Computer Chess Club: Tournaments and Matches
- Topic: Swiss Tournament Edition IX. Group E.
- Replies: 34
- Views: 4158
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...