Search found 16823 matches
- Wed Nov 06, 2019 7:51 pm
- Forum: Computer Chess Club: Programming and Technical Discussions
- Topic: oldie but goody
- Replies: 11
- Views: 1383
Re: oldie but goody
I think that number is wrong. Sounds more like a sigma 6/7. IIRC, the sigma 9 had a .73 microsecond clock, which would translate to about 1.3MIPS. If every instruction referenced memory it could not run that fast, but it was pretty fast for the day. Today my Apple watch has more computing power. :)
- Wed Nov 06, 2019 5:42 am
- Forum: Computer Chess Club: Programming and Technical Discussions
- Topic: oldie but goody
- Replies: 11
- Views: 1383
Re: oldie but goody
I would be interested, too, Dr. Hyatt. I have one of Jim Ablett's Cray Blitz Windows compiles (running from the command prompt) from 2008. The included source was also written in Fortran. I assume this is your code as well. Yes it was. But for the CB source it was NOT scanned in via OCR. I actually...
- Tue Nov 05, 2019 3:59 am
- Forum: Computer Chess Club: Programming and Technical Discussions
- Topic: oldie but goody
- Replies: 11
- Views: 1383
oldie but goody
I don't know if I have ever released this, but I was looking through old files and ran across a REALLY old version of my chess program. WAY before it had the "Cray" in its name. This is version 6.9, dated 1977, which sounds right. Right after the WCCC that year, I decided to get rid of the highly se...
- Mon Nov 04, 2019 2:45 am
- Forum: Computer Chess Club: Programming and Technical Discussions
- Topic: Limiting nodes to reduce engine strength
- Replies: 20
- Views: 2323
Re: Limiting nodes to reduce engine strength
Been playing with this for a couple of days. Using the OPs idea of dynamically adjusting the NPS, plus my original approach of randomizing the evaluation, I have gotten something that works. Nowhere near perfect yet, and calibrating it is a bit difficult. But I took a couple of open-source programs,...
- Fri Nov 01, 2019 6:45 pm
- Forum: Computer Chess Club: General Topics
- Topic: Tactics cannot be very important for chess
- Replies: 90
- Views: 5498
Re: Tactics cannot be very important for chess
But what is the "plan"? Has to be to checkmate the opponent's king. If you can't see a way to force that, then you seek a way to reach a position where that goal is more reachable, even if you can't see it. But think about it, the game of chess is not infinite. So it is theoretically possible to sea...
- Fri Nov 01, 2019 5:56 pm
- Forum: Computer Chess Club: General Topics
- Topic: Tactics cannot be very important for chess
- Replies: 90
- Views: 5498
Re: Tactics cannot be very important for chess
A strong GM, many years ago, wrote something to the effect "Chess is purely about tactics..." His thinking was the positional play is nothing more than very deep / very long-range tactics. IE what is bad about a backward pawn? It gives you a weakness and your opponent a target. A target that can't m...
- Thu Oct 31, 2019 8:27 pm
- Forum: Computer Chess Club: Programming and Technical Discussions
- Topic: Ubuntu Shell file
- Replies: 8
- Views: 1067
Re: Ubuntu Shell file
rather than executing the file that does the CD, simply type "source <filename>" and it will execute the cd command and whatever in the SAME (current) process, so that once you source the command and do a "pwd" you will find you are in the new directory. This works for the c-shell as I use it all th...
- Wed Oct 30, 2019 6:13 pm
- Forum: Computer Chess Club: Programming and Technical Discussions
- Topic: Decreasing Depth in MultiPV?
- Replies: 14
- Views: 1677
Re: Decreasing Depth in MultiPV?
I typically implement multi-PV by adding a few statements in the code that prints a newly found PV (and is thus only executed in the root). Normally alpha-beta would set alpha = bestScore just before this (after a score > alpha was found). The extra statements just lower alpha. As I control multi-P...
- Tue Oct 29, 2019 9:59 pm
- Forum: Computer Chess Club: Programming and Technical Discussions
- Topic: Limiting nodes to reduce engine strength
- Replies: 20
- Views: 2323
Re: Limiting nodes to reduce engine strength
OK, this topic tweaked my interest, so I am re-visiting this a bit. I eventually will get rid of the skill command and replace it with an "elo xxxx" command. I am currently working to establish the rating at 6M nodes per second, which is what Crafty runs on my MacBook using just one thread. I am goi...
- Tue Oct 29, 2019 7:07 pm
- Forum: Computer Chess Club: Programming and Technical Discussions
- Topic: Decreasing Depth in MultiPV?
- Replies: 14
- Views: 1677
Re: Decreasing Depth in MultiPV?
How will that work? After completing the first move (NOT necessarily the best move) if you start on the second best move with a +/- infinity alpha/beta bound, how can the search be efficient? You did lots of pruning on this move on previous iterations, but now, suddenly, you can't due to the a/b win...