Search found 1392 matches

by Ajedrecista
Thu Oct 12, 2017 4:33 pm
Forum: Computer Chess Club: General Topics
Topic: Nice puzzle and its solution
Replies: 8
Views: 1670

Re: Nice puzzle and its solution.

Hello Volker: Sorry, if this has been posted here before, but I just found it on youtube and I just find it an amazing win for white: [d]3k4/8/7p/2p1p1pP/1pPpPpP1/1P1P1P2/N7/2K5 w - - 0 1 Stockfish hasn't solved it here, but maybe on faster hardware there is a chance. Here is a video in which Simon ...
by Ajedrecista
Sat Aug 26, 2017 6:34 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: perft(15)
Replies: 19
Views: 6796

Re: Perft(15).

Hello Dann: Do you have stored statistics, such as how many mates are in the first 15 ply, how many stalemates, etc.? The current shortest known stalemates are 19-ply stalemates. It was discussed in the following thread: estimating the number of possible stalemates in perft(n) Regarding checks, chec...
by Ajedrecista
Fri Aug 25, 2017 6:56 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: perft(15)
Replies: 19
Views: 6796

Re: Perft(15): comparison of estimates with Ankan's result.

Hello Ankan: I have computed perft(15) of starting position. Any guesses before I post my result? Thank you very much! There is a Perft(15) estimates thread started by Steven: Perft(15) estimates thread There were really good estimates. Here is a summary of the estimates of that thread given in chro...
by Ajedrecista
Fri Aug 04, 2017 5:54 pm
Forum: Computer Chess Club: General Topics
Topic: search bug of stockfish and many programs
Replies: 69
Views: 9253

Re: Search bug of Stockfish and many engines.

Hello: This position offers a good chance to see how much engines prune, if we compare with raw perft values: k1b5/1p1p1p1p/pPpPpPpP/P1P1P1P1/8/8/8/K1B5 w - - 0 1 JetChess 1.0.0.0 perft(1) = 8 perft(2) = 8 perft(3) = 67 perft(4) = 67 perft(5) = 636 perft(6...
by Ajedrecista
Sat Jun 24, 2017 5:52 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Testing A against B by playing a pool of others
Replies: 2
Views: 779

Re: Testing A against B by playing a pool of others.

Hello Andrew: I am not a expert in Statistics, but anyway I will give you my opinion. I have a doubt: since you are using a trinomial model (wins, draws, loses), why do you use the binomial form of the standard deviation instead of the trinomial form? http://centaur.reading.ac.uk/4549/1/2003b_ICGA_J...
by Ajedrecista
Sat May 20, 2017 11:23 am
Forum: Computer Chess Club: General Topics
Topic: Komodo 10.4 is the new Theban Chess Champion.
Replies: 28
Views: 5454

Re: PERFT.

Hello: Here are some higher values of perft for this variant: Stockfish 8 by T. Romstad, M. Costalba, J. Kiiski, G. Linscott position fen 1p6/2p3kn/3p2pp/4pppp/5ppp/8/PPPPPPPP/PPPPPPKN w - - 0 1 perft 8 Position: 1/1 a2a3: 193200262 b2b3: 193379987 c2c3: 193485955 d2d3: 198581534 e2e3: 265684105 f2f...
by Ajedrecista
Sat May 13, 2017 10:50 am
Forum: Computer Chess Club: General Topics
Topic: Hang a Rook?
Replies: 10
Views: 2388

Re: Hang a rook?

Hello John: Sure, it calculates with the moves it doesn't prune. But if you then prune all reasonable moves... What can you expect from a search of only 321 positions? Indeed. Perft 4 from the position is 622,922. Although, to be fair, I checked several other strong engines, and all of them reported...
by Ajedrecista
Sat May 13, 2017 10:01 am
Forum: Computer Chess Club: General Topics
Topic: Wilo rating properties from FGRL rating lists
Replies: 47
Views: 11062

Re: WiLo rating properties from FGRL rating lists.

Hello: Just to complete the picture: Thanks. Yes to understand the difference between elo,wilo and normalized elo one can indeed look at small elo differences and do taylor series development. So we put (w,d,l)=(a+eps,1-2*a,a-eps) and we look at the dominant term in eps. The result is as follows elo...
by Ajedrecista
Sun Apr 30, 2017 10:24 am
Forum: Computer Chess Club: General Topics
Topic: Old engines
Replies: 2
Views: 1013

Re: Old engines.

Hello Gabor: Hi all, I am looking for two old engines, Cilian 4.14 and Dragon 4.6. I do have them, what I am looking for is the original Cilian 4.14 compiled by the author himself, and the WinBoard Dragon (it has separate exes for UCI and WB). If anyone have them please contact me. Thanks in advance...
by Ajedrecista
Thu Apr 27, 2017 7:02 pm
Forum: Computer Chess Club: General Topics
Topic: Stockfish on standard opening position 1 trillion nodes
Replies: 13
Views: 3143

Re: Stockfish on standard opening position 1 trillion nodes.

Hello: [...] info depth 59 seldepth 91 multipv 1 score cp 13 nodes 5449646140528 nps 0 tbhits 0 time -1731567787 [...] 59 5.449.646.140.528 2.124.365 2.565.305.934 29:16:35:06 1,20 Great as usual! But I have a doubt: is the time counter bounded between -2^31 and 2^31 - 1? From 0 to 2^31 - 1. From -2...