Search found 8998 matches

by Dann Corbit
Thu May 21, 2020 7:00 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: New idea or already known and used ?
Replies: 10
Views: 321

Re: New idea or already known and used ?

De Noose Daniel wrote:
Thu May 21, 2020 6:55 pm
Yes Dann, you're right. I badly explained myself : my idea is not really nullmove but only a nullmove for the opponent. As if you can play 3 moves and not the opponent. Maybe there is another name for this.
I don't understand how this will help.
Everything will look winning.
by Dann Corbit
Thu May 21, 2020 6:56 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: New idea or already known and used ?
Replies: 10
Views: 321

Re: New idea or already known and used ?

The reason null move works so well is that most moves are bad. A move that is worse than doing nothing does not need to be explored as carefully most of the time. But test suites often turn this sort of idea on it's head. That is the reason that they are fun. They usually involve a surprising sequen...
by Dann Corbit
Thu May 21, 2020 6:51 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: New idea or already known and used ?
Replies: 10
Views: 321

Re: New idea or already known and used ?

I think the idea would be better for quiet moves than for test problems.

Lots of test problems involve either sacrifices or zugzwang positions. Both of these are problematic for null moves.
Often, giving up a piece looks worse than a pass.
And when you are zugzwang, you don't want to pass.
by Dann Corbit
Thu May 21, 2020 6:35 pm
Forum: Computer Chess Club: General Topics
Topic: dm5 from king walk mates
Replies: 5
Views: 101

dm5 from king walk mates

I found a discussion about king walk mates that gave these possibilities: [Event "?"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "?"] [Black "?"] [Result "0-1"] 1.e4 e5 2.Ke2 Ke7 3.Kf3 Ke6 4.Kg3 Kf6 5.Qg4 Ke7 6.Qxd7+ Kf6 7.Qa4 Ke7 8.Kh4 Kf6 9.g3 Kg6# [Event "?"] [Site "?"] [Date "????.??.??"]...
by Dann Corbit
Thu May 21, 2020 5:03 pm
Forum: Computer Chess Club: General Topics
Topic: Bmi2 and AMD
Replies: 5
Views: 237

Re: Bmi2 and AMD

Compile for modern. A BMI compile on AMD is bad. Look at the BMI compiles here:
http://ipmanchess.yolasite.com/amd---in ... -bench.php
by Dann Corbit
Thu May 21, 2020 4:53 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: New idea or already known and used ?
Replies: 10
Views: 321

Re: New idea or already known and used ?

I don't think it will help a lot in general because at the start of the game of chess, the good moves are well known, and chess engines already do a lot of pruning in general searching (e.g. the branching factor for Stockfish and other very strong engines is about 1.5). But it could not hurt to try ...
by Dann Corbit
Thu May 21, 2020 8:04 am
Forum: Computer Chess Club: General Topics
Topic: How long until your engine finds this mate in 36?
Replies: 5
Views: 296

How long until your engine finds this mate in 36?

6r1/p1p1p1pP/P1PpP1P1/8/2P1B3/2K3pp/3P2rq/R5bk w - - acd 73; bm hxg8=N; c0 "S1 1st Commendation {m}; 2011.03.19; Timman, Jan; White wins"; c3 "hxg8=N"; c6 "Arves.07482"; ce 32696; dm 36; pm hxg8=N; pv hxg8=N d5 Bf3 d4+ Kb4 d3 Nh6 gxh6 g7 h5 g8=N h4 Nf6 exf6 e7 f5 e8=N f4 Nd6 cxd6 c7 d5 c8=Q dxc4 Rd...
by Dann Corbit
Wed May 20, 2020 6:03 pm
Forum: Computer Chess Club: General Topics
Topic: Any Chess GUI that reads ebooks (PDF)
Replies: 16
Views: 510

Re: Any Chess GUI that reads ebooks (PDF)

I tried the pdf pgn scanner.
I read the first file in my Arves PDF folder.
It found 16 games.
For every game it said "Failed to find first move"

I would have to say it is not ready for prime time.
by Dann Corbit
Wed May 20, 2020 4:24 am
Forum: Computer Chess Club: Tournaments and Matches
Topic: Tournament with Honey, Corchess, Bluefish-XI and Crystal
Replies: 9
Views: 1139

Re: Tournament with Honey, Corchess, Bluefish-XI and Crystal

Thanks for running the tests.
Inquiring minds want to know.
;-)
by Dann Corbit
Tue May 19, 2020 7:04 pm
Forum: Computer Chess Club: General Topics
Topic: Any Chess GUI that reads ebooks (PDF)
Replies: 16
Views: 510

Re: Any Chess GUI that reads ebooks (PDF)

hgm wrote:
Tue May 19, 2020 4:45 pm
So what should the database GUI do with the book?
I think the PDF book is a red herring.
He wants the functionality of a database.