Search found 8208 matches

by Dann Corbit
Thu Aug 15, 2019 10:17 pm
Forum: Computer Chess Club: General Topics
Topic: Three Test positions from Larsen, Euwe and Gufeld!
Replies: 12
Views: 1259

Re: Three Test positions from Larsen, Euwe and Gufeld!

Vinvin wrote:
Thu Aug 15, 2019 8:44 pm
Position 3 still interesting :
rnb2r2/3pppkp/p5p1/qPpQ4/P1P1n3/4PN2/4KPPP/RN3B1R w - - 0 12
Wasn't that position black to move previously?
by Dann Corbit
Thu Aug 15, 2019 9:19 pm
Forum: Computer Chess Club: General Topics
Topic: Test Position: Baburin-Adianto, Liechtenstein 1993
Replies: 12
Views: 827

Re: Test Position: Baburin-Adianto, Liechtenstein 1993

I see mate in 12 at depth 25 with cfish: q1r1k2r/1b3pp1/p3p3/P1b5/1pN1P3/3BBPp1/1P2Q1P1/R4RK1 b k - info depth 25 seldepth 25 multipv 1 score mate 12 nodes 127569780 nps 9248878 hashfull 41 tbhits 2 time 13793 pv e8e7 e2d2 c5e3 f1f2 e3d2 c4b6 a8b8 a1d1 c8c1 d1c1 b8f4 b6d5 e6d5 c1c7 f4c7 e4d5 c7c1 d3...
by Dann Corbit
Thu Aug 15, 2019 7:35 pm
Forum: Computer Chess Club: General Topics
Topic: Nh4 is hard to find, but the stats will tell you it is right
Replies: 17
Views: 1595

Re: Nh4 is hard to find, but the stats will tell you it is right

Vinvin wrote:
Thu Aug 15, 2019 6:36 pm

Is this position valid today ?
Nh4 is no more the strongest move for SF (3 best moves after 1 hour on 6 cores) :
That is a good question.
I found it statistically (Nh4 won far more games than the other moves).
But maybe there is a flaw in the plan that deeper searches find.

I will examine it.
by Dann Corbit
Wed Aug 14, 2019 9:25 pm
Forum: Computer Chess Club: General Topics
Topic: SCCT Noob book, Rc5 improvement
Replies: 0
Views: 123

SCCT Noob book, Rc5 improvement

This position from Sedat's latest tournament came from the book NooB: 4r1r1/pp3q1k/6pp/1p2Pp2/3PpPP1/P1R4P/4Q2K/2R5 w - - Move played was d5, and the result was a draw. But the move Rc5 wins the game. 4r1r1/pp3q1k/6pp/1p2Pp2/3PpPP1/P1R4P/4Q2K/2R5 w - - acd 36; acs 509; bm Rc5; ce 337; pm Rc5; pv Rc5...
by Dann Corbit
Wed Aug 14, 2019 9:16 pm
Forum: Computer Chess Club: General Topics
Topic: Crystal
Replies: 15
Views: 1027

Re: Crystal

Maybe you used multiple threads for the search? I get this with 11 threads: =========================== Total time (ms) : 2858 Nodes searched : 30682706 Nodes/second : 10735726 Invoked with: DCorbit@DCORBIT MINGW64 /f/project/dcorbit/Stockfish-crystal/src $ ./crystal-g64.exe bench 16384 11 > /dev/null
by Dann Corbit
Wed Aug 14, 2019 9:14 pm
Forum: Computer Chess Club: General Topics
Topic: Crystal
Replies: 15
Views: 1027

Re: Crystal

I got the right node count:
===========================
Total time (ms) : 4509
Nodes searched : 7215170
Nodes/second : 1600170

$ g++ --version
g++.exe (Rev1, Built by MSYS2 project) 9.2.0
by Dann Corbit
Wed Aug 14, 2019 5:15 am
Forum: Computer Chess Club: General Topics
Topic: Out of the Kai 450 positions, 99 not found by SF
Replies: 74
Views: 2430

Re: Out of the Kai 450 positions, 99 not found by SF

As far as how do engines improve opening theory, consider these contests by Sedat: https://sites.google.com/site/computerschess/scct-book-cs-29 The top books are heavily computer influenced. I guess that the "noob" book is based.on.the 20 ply Stockfish data but I just guess that by the name. Of cour...
by Dann Corbit
Tue Aug 13, 2019 7:31 am
Forum: Computer Chess Club: General Topics
Topic: Out of the Kai 450 positions, 99 not found by SF
Replies: 74
Views: 2430

Re: Out of the Kai 450 positions, 99 not found by SF

One caution with using outcomes is that book lines and memorized openings can have.errors along the way. For obvious reasons, error is.more probable following a.path without deep analysis. If your position is a book exit point and the opponents are high end engines of modern correspondence players a...
by Dann Corbit
Mon Aug 12, 2019 9:32 pm
Forum: Computer Chess Club: General Topics
Topic: Out of the Kai 450 positions, 99 not found by SF
Replies: 74
Views: 2430

Re: Out of the Kai 450 positions, 99 not found by SF

There are 90 with that new file used to create my definitions for field c3: 1bqrr1k1/1p3p1p/p1p5/2Nn1pp1/1P1P2b1/P3P1P1/2QN1P1P/R3RBK1 w - - acd 43; acs 6120; bm Rac1; c3 "Qb2"; cce 0; ce 81; id "midgames.151"; pm Rac1; pv Rac1 Bc7; 1br3k1/pb2qpp1/1p2pn1p/3pN3/3P1P2/1Q2P3/PPR1NPBP/6K1 w - - acd 55; ...
by Dann Corbit
Mon Aug 12, 2019 9:12 pm
Forum: Computer Chess Club: General Topics
Topic: Out of the Kai 450 positions, 99 not found by SF
Replies: 74
Views: 2430

Re: Out of the Kai 450 positions, 99 not found by SF

From the current two files supplied, there are 92 with different move choices than those provided: 1r3rk1/1b2np1p/p3qp1Q/1p6/4p2P/2P5/1PN1BPP1/2KR3R w - - acd 56; acs 22080; bm Nd4; c3 "Ne3"; cce 266; ce 31; id "midgames.216"; pm Nd4 {5}; pv Nd4 Qb6; white_wins 3; black_wins 0; draws 2; r1b2rk1/1ppn...