Search found 220 matches

by silentshark
Thu Jun 13, 2019 5:53 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: 74th Amateur Series Division 6
Replies: 12
Views: 638

Re: 74th Amateur Series Division 6

Congratulations to Tom (Francesca author) for the tournament victory, plus promotion into Division 5 for the next series. :) Thanks to everybody who took an interest in the tournament. Thanks to the engine authors who frequented the broadcast chat too. Great result. Not often that the old girl wins...
by silentshark
Mon Jun 10, 2019 6:29 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Using evaluation hash score as current bestscore (initial guess)
Replies: 13
Views: 682

Re: Using evaluation hash score as current bestscore (initial guess)

I think it is clear the adjusted value could technically utilize tighter bounds. How much tighter depends on the information gained from hash. On the other hand, a position found in your hash may be a more difficult one on average, so perhaps less tight bounds would be better after all. Most likely...
by silentshark
Sat Jun 08, 2019 11:52 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Hash collision?
Replies: 42
Views: 1620

Re: Hash collision?

Turns out that it may not matter very much: http://www.craftychess.com/hyatt/collisions.html Right, although I noted the useful summary in the article - "In summary, 32 bit signatures produced wrong moves and scores, while 64 bits did not". I may go back to using more that 16 bits, for my own sanit...
by silentshark
Sat Jun 08, 2019 9:16 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Hash collision?
Replies: 42
Views: 1620

Re: Hash collision?

So.. going back to my original posting, here's my data. What do people think about the probability of hash collisions causing strange evals and moves? 1. Time control 40 moves in 25 minutes 2. Searching approx 2 million NPS 3. Size of hash table, 2097152, with 4 buckets 4. Using a 64 bit int for the...
by silentshark
Fri Jun 07, 2019 7:15 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Hash collision?
Replies: 42
Views: 1620

Re: Hash collision?

This is all useful. Thanks.

So the big question for me, remains. 16 bits - good enough, or will screw you up sometimes?

(Of course, maybe I have another bug elsewhere, but hey.)
by silentshark
Wed Jun 05, 2019 6:00 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Hash collision?
Replies: 42
Views: 1620

Hash collision?

Looking at the recent debug logs of a game, I have a bug which I can't reproduce. All too common! The bug manifests itself in some weird scores on certain moves. It may well be something else, but I'm wondering whether I've got a hashing problem. I use a 64 bit int for the main hash position, and th...
by silentshark
Fri May 31, 2019 3:37 pm
Forum: Computer Chess Club: General Topics
Topic: New engine releases 2019
Replies: 212
Views: 33004

Re: New engine releases 2019

Francesca 0.24 is released. You can download from my website, www.silentshark.co.uk

This version fixes a nasty bug, and there are a few LMR improvements. In self play, it's just over +20 ELO vs 0.23, so may be a little less versus other engines.

Enjoy :-)
by silentshark
Wed May 29, 2019 9:08 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: Swiss Tournament Ed.VIII. Group C.
Replies: 53
Views: 2493

Re: Swiss Tournament Ed.VIII. Group C.

If you wanted to include my engine, Francesca, that would be fun - www.silentshark.co.uk. Unless she is already playing in this, or in another division or whatever. Cheers, Tom Hi Tom Francesca will play in Group A. Last season she promoted to Group A and kept a good position in that difficult grou...
by silentshark
Wed May 29, 2019 5:13 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: Swiss Tournament Ed.VIII. Group C.
Replies: 53
Views: 2493

Re: Swiss Tournament Ed.VIII. Group C.

If you wanted to include my engine, Francesca, that would be fun - www.silentshark.co.uk. Unless she is already playing in this, or in another division or whatever.

Cheers,
Tom
by silentshark
Wed May 29, 2019 6:24 am
Forum: Computer Chess Club: Tournaments and Matches
Topic: 74th Amateur Series Division 6
Replies: 12
Views: 638

Re: 74th Amateur Series Division 6

Games will be available for download after every six rounds from here: http://kirill-kryukov.com/chess/discussion-board/viewtopic.php?f=7&t=11172 If you install TLCV (Tom's Live Chess Viewer) on your computer, you can watch the games live move by move. You'll also be able to chat to others followin...