Search found 94 matches

by Karol Majewski
Tue Jul 24, 2018 8:03 pm
Forum: Computer Chess Club: General Topics
Topic: Online chess engines on powerul machines - what are the options?
Replies: 44
Views: 4831

Re: Online chess engines on powerul machines - what are the options?

OK, so here's the position. Black to move. After moving pieces and looking at evaluations I came to the conclusion that 10...Bd7 is objectively stronger than 10...Nd7. Now I want to - kind of - prove it and check if the engine (probably latest Stocky) will find 10...Bd7 in a single run. This require...
by Karol Majewski
Tue Jul 24, 2018 7:35 pm
Forum: Computer Chess Club: General Topics
Topic: Online chess engines on powerul machines - what are the options?
Replies: 44
Views: 4831

Online chess engines on powerul machines - what are the options?

OK, so I need to do some analysis on powerful computer. I do not own one, but I feel ready to pay for renting it. So far I have found two options: 1) Rybka cluster - the price is ridiculous and the engine is obsolete so that's not an option. 2) nextchessmove.com - 20 CPU is fine but they offer max o...
by Karol Majewski
Sat Aug 20, 2016 6:16 am
Forum: Computer Chess Club: General Topics
Topic: Stockfish fínds mate in 50
Replies: 16
Views: 3881

Re: Stockfish fínds mate in 50

On my list of positions that Stockfish can't solve but other top engines can - there is this: [d]3N2r1/3Kp3/4Pk2/8/Bp6/6b1/2P5/8 b - - 0 1 According to my analysis, it's mate in 29 starting with Rxd8+! But Stockfish will never find this move. Analysis by Stockfish 180816 64 POPCNT: <...> 1...Rg4 2....
by Karol Majewski
Thu Aug 18, 2016 3:49 pm
Forum: Computer Chess Club: General Topics
Topic: Stockfish fínds mate in 50
Replies: 16
Views: 3881

Re: Stockfish fínds mate in 50

Cool.

BTW. On my list of positions that Stockfish can't solve but other top engines can - there is this:

[d]3N2r1/3Kp3/4Pk2/8/Bp6/6b1/2P5/8 b - - 0 1

According to my analysis, it's mate in 29 starting with Rxd8+!

But Stockfish will never find this move.
by Karol Majewski
Mon Aug 08, 2016 4:48 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Is centipawn the right unit for measuring the score?
Replies: 17
Views: 3663

Re: Is centipawn the right unit for measuring the score?

Thank you. I think I'll use 128 for a pawn and then convert to cp at the output (-21.875%).
by Karol Majewski
Mon Aug 08, 2016 2:30 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Is centipawn the right unit for measuring the score?
Replies: 17
Views: 3663

Is centipawn the right unit for measuring the score?

Hi, I am newbie to programming world. I write my UCI engine from scratch. Currently I work on evaluation function and came to the conclusion that using centipawn as a base unit to measure the score has one drawback: I can't write 1/8 pawn as 12.5 cp; I have to round it to 12 or 13 cp. So, a single f...
by Karol Majewski
Sun Jun 12, 2016 12:43 pm
Forum: Computer Chess Club: General Topics
Topic: Komodo 9 vs Komodo 10 memory difference
Replies: 13
Views: 2273

Re: Komodo 9 vs Komodo 10 memory difference

Komodo does things differently than other engines. One change since early Komodo 9 versions is I made the size of a hash entry smaller. The smaller the entry the faster the access. Most engines hash entries are power of 2. Like 8 or 16 bytes. Komodo uses 12 bytes, so hash allocation uses he formula...
by Karol Majewski
Tue Mar 08, 2016 9:16 am
Forum: Computer Chess Club: General Topics
Topic: To Larry Kaufman
Replies: 104
Views: 28997

Re: To Larry Kaufman

Larry, one small request: all parameter names should start with Uppercase. Therefore it should be 'Suppress'.

Also, it should be 'Use LMR' and not 'Use Lmr' as 'LMR' is acronym, just as 'UCI' is.

Best
Karol
by Karol Majewski
Thu Jan 08, 2015 10:55 pm
Forum: Computer Chess Club: General Topics
Topic: any UCI pure brute-force engines?
Replies: 14
Views: 3249

Re: any UCI pure brute-force engines?

lech wrote:I tried it with my new idea (Sting-sf-48, hash 1024M, dual core) without some dirty "Monte Carlo" or "rule50" or "nullMove search disabled" or "tablebases". (time 5 second!)
5 seconds on dual core... wow. Looking forward to test Sting 4.8.
by Karol Majewski
Wed Jan 07, 2015 11:00 pm
Forum: Computer Chess Club: General Topics
Topic: any UCI pure brute-force engines?
Replies: 14
Views: 3249

Re: any UCI pure brute-force engines?

Not even Sting. 8/1pN4r/5pkp/8/5K1p/2P4N/P3Bn2/8 w - - Engine: Sting SF 4.7 (4096 MB) by Tord Romstad, Marco Costalba, Joona Kii 17/29 0:01 -0.92 1.Nxf2 Rxc7 2.Bd3+ Kg7 3.c4 Rd7 4.Kg4 Rd4+ 5.Kf3 b6 6.a4 h5 7.Ke3 Rd7 8.Nh3 (1.527.972) 1097 18.23 0:02 -1.05-- 1.Nxf2 (2.350.162) 1109 18/30 0:02 -0.88 1...