Search found 883 matches

by Ras
Sun Nov 06, 2016 6:27 pm
Forum: Computer Chess Club: General Topics
Topic: WCC and Russian Hackers
Replies: 13
Views: 2653

Re: WCC and Russian Hackers

Thomas Lagershausen wrote:So Carlsen has luck that he didn´t play against an american guy. The NSA has billions of us dollar and a manpower of hundred thousand to hack every man of the world.
Yeah, but the issue is that the Russians can do this just with a pencil.
by Ras
Sun Nov 06, 2016 5:45 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: couple of questions about stockfish code ?
Replies: 95
Views: 11740

Re: couple of questions about stockfish code ?

3-I stumbled upon an old post here that claims that storing only the 32bit upper portion of the key degrades performance "I know it causes more collisions" It doesn't have to. There are also the implicit lower bits of the hash value, these are in the index, assuming that the table size is a power o...
by Ras
Sun Nov 06, 2016 12:08 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: King Indian like and usefulness of engines
Replies: 40
Views: 6173

Re: King Indian like and usefulness of engines

you see many victories from average players against the comps because they did not understand the building up of the black pieces on the king side. The CT800 has an asymmetric evaluation penalising positions with a blocked centre for the computer side only. This is a simple kind of anti human mode....
by Ras
Sat Nov 05, 2016 10:39 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: New idea for "easy move detection"
Replies: 3
Views: 1613

New idea for "easy move detection"

I've implemented an "easy move detection" to the CT800. The algorithm goes as follows: - In the root position, do the normal alpha-beta-minimax move sorting at depth 3 plus QS. - Check whether the drop from the best to the second best move is at least 240 centipawns (cps). - If none of the following...
by Ras
Mon Oct 31, 2016 10:46 pm
Forum: Computer Chess Club: General Topics
Topic: Deep Shredder 13 Windows out
Replies: 66
Views: 57804

Re: Deep Shredder 13 Windows out

I have been buying Shredder since version 11, and I will buy this version, too. No need for tests or whatever. I trust that you would not have released this version if it hadn't been worth buying, and I'll put my money where my mouth is - literally.
by Ras
Sat Oct 22, 2016 9:37 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Max moves in a position
Replies: 21
Views: 4018

Re: Max moves in a position

while 218 is the discovered maximum, I ran many test games, and the maximum in real games were 93 (pseudo-legal) moves. My movelist arrays have 150 moves, which is sufficient for real applications. However, if you aren't as low on RAM as I am (28k stack), you can safely allocate something like 256 m...
by Ras
Sat Oct 22, 2016 12:55 pm
Forum: Computer Chess Club: General Topics
Topic: Why do engines lack mate solving?
Replies: 29
Views: 4741

Re: Why do engines lack mate solving?

Evert wrote:How is that an issue?
While the mate in 8 posted above is found within 5 minutes on the target platform (good), the re-search for the alternative (that doesn't exist) takes 2:20 hours, that is the issue.
by Ras
Fri Oct 21, 2016 8:57 pm
Forum: Computer Chess Club: General Topics
Topic: Why do engines lack mate solving?
Replies: 29
Views: 4741

Re: Why do engines lack mate solving?

If I set the aspiration window for a mate score, it finds the solution at depth 7 in under a second: Nah, the issue isn't finding the mate, that's the easy part. The issue is blocking the already found solving move in the root position and then proving that there isn't an alternative mate anymore w...
by Ras
Fri Oct 21, 2016 6:20 pm
Forum: Computer Chess Club: General Topics
Topic: Why do engines lack mate solving?
Replies: 29
Views: 4741

Re: Why do engines lack mate solving?

ok, so far, I get very nice results with the approach of first only examining check-giving moves for the side to deliver mate, and in case of failure to find mate, push out the start depth for "checking moves alone" move by move. So, an iteration. For mate in 1-8, that is OK. I even dug out a mate i...
by Ras
Tue Oct 18, 2016 10:52 pm
Forum: Computer Chess Club: General Topics
Topic: Why do engines lack mate solving?
Replies: 29
Views: 4741

Re: Why do engines lack mate solving?

Ras wrote:then captures with MVA-LVV
MVV-LVA of course.