Search found 3610 matches

by Vinvin
Wed Sep 25, 2019 7:42 am
Forum: Computer Chess Club: General Topics
Topic: Is e4 significantly better than d4?
Replies: 62
Views: 6384

Re: Is e4 significantly better than d4?

You can already split 1.e4 in 3 clear different openings : 1...e5 , 1...c5 and 1...e6.
by Vinvin
Tue Sep 24, 2019 5:25 pm
Forum: Computer Chess Club: General Topics
Topic: Hard-Talkchess-2019 set
Replies: 108
Views: 18847

Re: Hard-Talkchess-2019 set

Vinvin wrote:
Mon Sep 23, 2019 9:21 pm
...
And I'm adding 6 older positions, sometimes easy and sometimes hard :

Code: Select all

...
rk1b4/p2p2p1/1P6/2R2P2/8/2K5/8/5B2 w - - bm Rc8+;
...
Now I remember why this position is not good : Rc8+ is sometime evaluated as 0.00 as some other moves.
I'm removing this one.
by Vinvin
Tue Sep 24, 2019 2:02 pm
Forum: Computer Chess Club: General Topics
Topic: About my test positions set
Replies: 35
Views: 6927

Re: About my test positions set

... My hard test suite 2008 : http://www.talkchess.com/forum/viewtopic.php?t=22402 ... Even older here, the very beginning in 2006 : https://www.stmintz.com/ccc/index.php?id=477582 And 1 month before : https://www.stmintz.com/ccc/index.php?id=475633 https://www.stmintz.com/ccc/index.php?id=474224 A...
by Vinvin
Tue Sep 24, 2019 12:32 pm
Forum: Computer Chess Club: General Topics
Topic: Hard-Talkchess-2019 set
Replies: 108
Views: 18847

Re: Hard-Talkchess-2019 set

Hi Vincent, In this position: r1q2rk1/ppp1bp2/6p1/3pNPn1/7p/2PP3P/P6B/1R1Q1RK1 w - - 0 1 (Nr. 177 in the initial list) I've found out 1.Rb2 are equal to 1.f6 Analysis by Stockfish 250719 64 BMI2: 1. +- (3.64) : 1.Rb2 Bf6 2.Rg2 Bxe5 3.Bxe5 f6 4.Qg4 Qd7 5.Bd4 Rae8 6.Qxh4 Qh7 7.Qxh7+ Kxh7 8.h4 Ne6 9.f...
by Vinvin
Tue Sep 24, 2019 9:48 am
Forum: Computer Chess Club: General Topics
Topic: Hard-Talkchess-2019 set
Replies: 108
Views: 18847

Re: Hard-Talkchess-2019 set

These are missing the plus symbol (check) on the bm : 1nrrb1k1/1qn1bppp/pp2p3/3pP3/N2P3P/1P1B1NP1/PBR1QPK1/2R5 w - - 1r1rb1k1/5ppp/4p3/1p1p3P/1q2P2Q/pN3P2/PPP4P/1K1R2R1 w - - 1r6/4k3/r2p2p1/2pR1p1p/2P1pP1P/pPK1P1P1/P7/1B6 b - - 1rb4k/p5np/3p1rp1/1ppB4/2N2P2/1P2R1P1/P1P4P/4R1K1 w - - 2b1r3/r2ppN2/8/...
by Vinvin
Mon Sep 23, 2019 10:55 pm
Forum: Computer Chess Club: General Topics
Topic: Hard-Talkchess-2019 set
Replies: 108
Views: 18847

Re: Hard-Talkchess-2019 set

These are missing the plus symbol (check) on the bm : 1nrrb1k1/1qn1bppp/pp2p3/3pP3/N2P3P/1P1B1NP1/PBR1QPK1/2R5 w - - 1r1rb1k1/5ppp/4p3/1p1p3P/1q2P2Q/pN3P2/PPP4P/1K1R2R1 w - - 1r6/4k3/r2p2p1/2pR1p1p/2P1pP1P/pPK1P1P1/P7/1B6 b - - 1rb4k/p5np/3p1rp1/1ppB4/2N2P2/1P2R1P1/P1P4P/4R1K1 w - - 2b1r3/r2ppN2/8/...
by Vinvin
Mon Sep 23, 2019 9:21 pm
Forum: Computer Chess Club: General Topics
Topic: Hard-Talkchess-2019 set
Replies: 108
Views: 18847

Re: Hard-Talkchess-2019 set

The ep notation d6 is spurious here, since it has no affect on the position. r1b1k1r1/1p2np1p/p1n1pQp1/3p4/3NPP2/P2RB3/2PK2PP/q4B1R w q d6 I prefer: r1b1k1r1/1p2np1p/p1n1pQp1/3p4/3NPP2/P2RB3/2PK2PP/q4B1R w q - I know the EPD standard says always set the flag when the pawn moves 2 spaces. But it dou...
by Vinvin
Thu Sep 19, 2019 8:22 am
Forum: Computer Chess Club: General Topics
Topic: That Mate in 5 again
Replies: 3
Views: 515

Re: That Mate in 5 again

Yes, while I was checking old test positions I found some regressions as well. Especially for this 3 positions : [d]4k1rr/1R1R3p/8/8/8/2K5/7P/8 w k - bm Rd2; [d]rk1b4/p2p2p1/1P6/2R2P2/8/2K5/8/5B2 w - - bm Rc8+; [d]8/1p6/p4p1p/2p1P2k/5P2/6pP/1P4P1/6K1 w - - bm f5; And this "simple" mate in 8 is very ...
by Vinvin
Wed Sep 18, 2019 5:33 pm
Forum: Computer Chess Club: General Topics
Topic: Hard-Talkchess-2019 set
Replies: 108
Views: 18847

Re: Hard-Talkchess-2019 set

... Good test position : 2k5/2p5/1q1p4/pPpPp1pp/N1P1Pp2/P4PbP/KQ4P1/8 w - - am Nxb6+?; c1 "diff=10"; 2k5/2p5/1q1p4/pPpPp1pp/N1P1Pp2/P4PbP/KQ4P1/8 w - - am Nxb6+?; c1 "diff=10"; Nxb6+ is remis. All other moves also remis, or is here a possible winning move? Analysis by Stockfish 120919 64 BMI2: pv=2...
by Vinvin
Wed Sep 18, 2019 12:55 pm
Forum: Computer Chess Club: General Topics
Topic: Hard-Talkchess-2019 set
Replies: 108
Views: 18847

Re: Hard-Talkchess-2019 set

needs the check sign... Thanks ! The 209 positions with the "+" sign added : 1B1K1k2/4N2p/3pP1pP/6p1/p7/3N2b1/2r2p2/8 w - - bm Nc6; 1B1r4/rp2npkp/2b1pbp1/1qp5/nPN1R3/1P1P1QP1/2P2PBP/5R1K w - - bm Qxf6+; 1N4K1/1pp1p3/7k/2r3pP/p2pp1P1/P6N/8/2B5 w - - bm Nc6; 1N6/2pp4/3k1P2/p7/1pK1P3/5P1P/3r2N1/8 w - ...