Search found 1075 matches

by Ras
Sat Jun 10, 2017 1:26 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Zobrist free
Replies: 32
Views: 5399

Re: Zobrist free

Then they aren't tolerable at all and with a 48-bit hash you will see some. I have added some additional checks when a lookup detects there is a move stored, no matter whether the move is actually used (because of alpha/beta/exact). I'm checking that the from-square holds a piece of the right colou...
by Ras
Sat Jun 10, 2017 12:47 pm
Forum: Computer Chess Club: General Topics
Topic: Important announcement: World Computer Chess Championship –
Replies: 75
Views: 26059

Re: Important announcement: World Computer Chess Championshi

Maybe there's another problem with the travel in general. International air travel in particular has become nasty due to security lockdowns. It is only getting worse over time, see the current ideas to ban laptops (and have them stolen from or damaged in checked baggage). The event is located in the...
by Ras
Thu Jun 08, 2017 11:12 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Zobrist free
Replies: 32
Views: 5399

Re: Zobrist free

That's a psychological issue rather than a technical one. People fear what they can't control, even if the probability is vanishingly small and the overall ELO loss due to less speed outweighs the risk of a hash collision. If you care about bad moves, I'd tackle static eval first so that silly openi...
by Ras
Thu Jun 08, 2017 9:00 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Zobrist free
Replies: 32
Views: 5399

Re: Zobrist free

Henk wrote:I wanted to eliminate the risk of a hash collision.
There is a paper by Bob Hyatt that shows you don't have to worry about hash collisions if you store at least 48 bits of hash. On PCs, you usually store the full 64 bit value, and collisions become a non-issue in practice.
by Ras
Wed Jun 07, 2017 11:44 pm
Forum: Chess Players Forum
Topic: Nature or nurture? Chess players have higher than average IQ
Replies: 11
Views: 5848

Re: Nature or nurture? Chess players have higher than averag

Sean Evans wrote:Why did the chicken cross the road?
Because the endgame table bases indicated that the game was won over there.
by Ras
Wed Jun 07, 2017 11:34 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Zobrist free
Replies: 32
Views: 5399

Re: Zobrist free

Henk wrote:Talking about maintainable software.
Uhm.. version control / backup? Even just saving the whole folder into a ZIP archive named by date may work.
by Ras
Wed Jun 07, 2017 11:32 pm
Forum: Computer Chess Club: General Topics
Topic: CT800 V1.10 released
Replies: 6
Views: 1403

Re: CT800 V1.10 released

The MM5 didn't have a chance to see that. White has to give some material after 26. ... f3, but only to avoid even more loss later. This "later" is way beyond the horizon of both machines. DeepShredder is at 26/49 plies on my PC already after 1 second, so that's a different league. But that's normal...
by Ras
Wed Jun 07, 2017 12:29 am
Forum: Computer Chess Club: General Topics
Topic: CT800 V1.10 released
Replies: 6
Views: 1403

Re: CT800 V1.10 released

For your amusement, here is a game of the CT800 vs. Mephisto MM5 with HG550 opening module, both at 30 minutes per game. The MM5 is one of my favourite challengers because it plays very actively. My compliments to Ed Schroeder for this marvel on a tiny 5 MHz 6502 CPU. The CT800 starts out in a calm ...
by Ras
Tue Jun 06, 2017 10:47 pm
Forum: Computer Chess Club: General Topics
Topic: CT800 V1.10 released
Replies: 6
Views: 1403

Re: CT800 V1.10 released

Great ! It looks like Compuchess or Conic chess from early days of dedicated chess machines ! :wink: Thanks. :-) What I had in mind was the famous Mephisto "briquette", just with current technology. Oh, and with more strength, should be around ELO 2100, i.e. a challenge for hobby players. Especiall...
by Ras
Tue Jun 06, 2017 10:23 pm
Forum: Computer Chess Club: General Topics
Topic: CT800 V1.10 released
Replies: 6
Views: 1403

CT800 V1.10 released

I have released the CT800 software V1.10. The announcement is a bit delayed because the release overlapped with changing my web hosting provider in favour of one who embraces Let's Encrypt SSL certificates. The most important changes (see https://www.ct800.net/sw_release_v110.htm for download): - Mo...