Search found 224 matches

by silentshark
Sat Jul 13, 2019 8:34 pm
Forum: Computer Chess Club: General Topics
Topic: Ferret 1.00 v258 - program from 1995
Replies: 36
Views: 3063

Re: Ferret 1.00 v258 - program from 1995

Well, I thought I'd just throw this in, given the Bruce/Ferret thread. I first met Bruce at WMCCC, 1995, Paderborn. It was a great event, where a lot of us amateurs met for the first time. Bruce was/is a real gent, and one of those people who you think 'wow, he's figured everything out 100x better t...
by silentshark
Tue Jul 09, 2019 5:30 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: Demon Of The Deep
Replies: 17
Views: 650

Re: Demon Of The Deep

Graham Banks wrote:
Tue Jul 09, 2019 7:43 am
Congratulations to Alvaro (RuyDos author) for the tournament victory. :)

Thanks to all who took an interest in this tournament, especially the many engine authors who visited the broadcast.
Great tournament - very close at the top in the end :-)
by silentshark
Sat Jul 06, 2019 7:08 am
Forum: Computer Chess Club: Tournaments and Matches
Topic: Swiss Tournament Ed.VIII. Group A.
Replies: 64
Views: 1619

Re: Swiss Tournament Ed.VIII. Group A.

Some games of Round 1: [Event "Swiss Tournament Ed.VIII. Group A"] [Site "CCRL"] [Date "2019.07.04"] [Round "1.19"] [White "Defenchess (SCTR) 1.1f 64-bit"] [Black "Francesca MAD 0.24 64-bit"] [Result "1-0"] [BlackElo "2763"] [ECO "C08"] [Opening "French"] [Time "20:26:33"] [Variation "Tarrasch, Ope...
by silentshark
Thu Jun 27, 2019 4:55 pm
Forum: Computer Chess Club: General Topics
Topic: Congratulations to Jon Dart
Replies: 11
Views: 1396

Re: Congratulations to Jon Dart

I agree. Congrats. I've never met Jon in person, but his postings are always constructive and helpful - seems like a top guy.

And I remember the days when Arasan was a weak little thing, and my program could kill it repeatedly. Not now!!

Congratulations, man :-)
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: 1073

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: 842

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: 2238

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: 2238

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: 2238

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: 2238

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...