Search found 444 matches

by D Sceviour
Sat Sep 21, 2019 12:53 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: 76th Amateur Series Division 1
Replies: 16
Views: 1052

Re: 76th Amateur Series Division 1

I continue to be pleased with Schooners efforts to under-trade for a positional advantage. It makes for an interesting style. Schooner has a 83.57% similarity with Xiphos 0.3 when comparing the results on depth=1, thus basically the evaluation function of Schooner is about the same as Xiphos 0.3 Th...
by D Sceviour
Wed Sep 18, 2019 6:31 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: self test
Replies: 10
Views: 463

Re: self test

I'm facing a self test issue ... I have a +40 in self-testing that seems to be in fact a -20 against others ... I'm quite aware that self-test are often over optimistic, but here :shock: :shock: This concern eval features that are taking into account "next move" possibilities (hanging pieces, forks...
by D Sceviour
Tue Sep 17, 2019 1:04 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Basic endgames
Replies: 22
Views: 855

Re: Basic endgames

[d]4k3/8/8/R7/4K3/8/8/8 w - - 0 1 Schooner v2.1 needs 107674 nodes to verify the minimum mate depth, but the winning move is found instantly. 16 +327.54 107674 0:00.03 a5a7 e8d8 e4e5 d8c8 e5d6 c8b8 a7c7 b8a8 d6c6 a8b8 c6b6 b8a8 c7c8# 15 +327.52 76800 0:00.02 a5a7 e8d8 e4e5 d8c8 e5d6 c8b8 a7c7 b8a8 d...
by D Sceviour
Sat Sep 14, 2019 7:42 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Crafty 25.3 MSVS 2019
Replies: 32
Views: 1839

Re: Crafty 25.3 MSVS 2019

For MSVC (_MSC_VER defined) you want: _BitScanForward64, _BitScanReverse64 for LSB, MSB: https://docs.microsoft.com/en-us/cpp/intrinsics/bitscanforward-bitscanforward64?view=vs-2019 Those seem to be ugly, returning the result through a pointer passed as an argument. Not so good for me as ALL of my ...
by D Sceviour
Sun Sep 08, 2019 2:18 am
Forum: Computer Chess Club: Tournaments and Matches
Topic: 76th Amateur Series Division 1
Replies: 16
Views: 1052

Re: 76th Amateur Series Division 1

I continue to be pleased with Schooners efforts to under-trade for a positional advantage. It makes for an interesting style. From the game Laser-Schooner on Blacks 32nd move:

[d]k2r4/pp3p2/4p1p1/n1Pn2r1/P5Bq/4P2P/1BQ1KP2/2RR4 b - - 2 32

32... RxB
by D Sceviour
Tue Aug 20, 2019 12:47 pm
Forum: Computer Chess Club: General Topics
Topic: The advantages of NN Learning engines..........
Replies: 8
Views: 985

Re: The advantages of NN Learning engines..........

I forced LCZero to play the same opening 5 times and after it lost the first two games I gave it to analyze and when it play from the 3rd game on it avoided playing the same losing moves which made it to lose against Stockfish and it won game 3, 4 and 5. PS: I was wondering if ab engines have this ...
by D Sceviour
Sun Aug 11, 2019 3:33 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: SYZYGY question
Replies: 7
Views: 1319

Re: SYZYGY question

bob wrote:
Sun Aug 11, 2019 2:21 am
What am I doing wrong here or is there a bug in this fairly old code for handling your endgame tables?
Must be. Nothing wrong here with Schooner and the 6-piece egtb.

Code: Select all

  0	+326.45	1	0:00.00	b6b7
For a guess, maybe try looking at the en passant flags in the move list for an error.
by D Sceviour
Sun Aug 04, 2019 3:44 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: killer index by "ply" or "ply"
Replies: 16
Views: 3037

Re: killer index by "ply" or "ply"

I do clear all killers when search begins but not each ply+1 killers at each pvs node. Writting this I understand that it is worthless to store killers index by "real half move" as I fully clear the killer table ... :oops: But I still don't get why Xiphos is clearing ply+1 killers. Xiphos change lo...
by D Sceviour
Sat Jul 27, 2019 7:50 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: On-line engine blitz tourney July
Replies: 55
Views: 6610

Re: On-line engine blitz tourney July

Thank you for trying. See everyone next time.
by D Sceviour
Tue Jul 23, 2019 1:12 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: So called backward analysis
Replies: 5
Views: 900

Re: So called backward analysis

The usual Winboard command for taking back a move is "undo". The "remove" command is documented for xboard protocol but I was never able to find an occurance of it ever sent by Winboard. Instead, an undocumented "back [n]" command may be sent by Winboard, Arena or other GUI. Winboard will remember t...