Search found 3284 matches

by Sven
Thu Aug 22, 2019 11:53 am
Forum: Computer Chess Club: Tournaments and Matches
Topic: 75th Amateur Series Division 6
Replies: 12
Views: 685

Re: 75th Amateur Series Division 6

Thanks to Graham for running this tourney! Now this is the first time that Jumbo has managed to stay in Div 6 :D :D :D
by Sven
Thu Aug 22, 2019 11:47 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: PVS, window, and mate
Replies: 15
Views: 536

Re: PVS, window, and mate

What if White to play. First move of the supposed deep mate sequence for White is a quiet move (for instance a pawn push to reduce King mobility). Best answer for black is in fact a shorter mate or a dramatic material gain that White is not viewing because it starts by a queen sac. That is a valid ...
by Sven
Wed Aug 21, 2019 12:28 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: PVS, window, and mate
Replies: 15
Views: 536

Re: PVS, window, and mate

And why would you assume that searching one root move with pruning enabled could ever return a mate score that is false? Well, pruning is disabled when in check ... but there is a lot of moves that are pruned without being in check before that crucial moment and some of them may have been better fo...
by Sven
Tue Aug 20, 2019 9:36 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: PVS, window, and mate
Replies: 15
Views: 536

Re: PVS, window, and mate

I think I already started a similar discussion some months ago ... anyway I'm struggling to fix something inside Minic. Here's the thing : when doing a window search you gradually increase alpha and/or beta until the return score fits in the given interval. When an engine discover a deep mate, let'...
by Sven
Sun Aug 18, 2019 8:52 am
Forum: Computer Chess Club: General Topics
Topic: Where did all these 3400 engines come from?
Replies: 31
Views: 1504

Re: Where did all these 3400 engines come from?

On a side note, where did all these 3400 engines come from? When I left there was 6 engines that cracked 3300+. Is this more of the same from Robbolitto and what not? Which 3400 engines are you talking about? In the current CCRL 40/40 list there are three, plus one almost 3400: - SugaR is a Stockfi...
by Sven
Thu Aug 15, 2019 11:46 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: msys mingw64 trouble
Replies: 9
Views: 954

Solved! (Re: msys mingw64 trouble)

It is annoying that Jumbo needs some CygWin DLLs at runtime. Therefore I am trying to switch to MinGW64 under MSYS2 64bit, expecting a way to build a standalone binary that does not require additional DLLs apart from Windows system DLLs. First step was to use MSYS gcc. Build worked fine, no problem...
by Sven
Mon Aug 12, 2019 9:23 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Bitboard logic: identifying 4 squares in a block
Replies: 8
Views: 514

Re: Bitboard logic: identifying 4 squares in a block

I want to be able to identify a pattern of 4 pieces forming a square anywhere on a board, such as: - - - - - - - - x x - - - - - x x - - - - - - - - - - - - - - - - - - The board could be any size. The pattern can occur anywhere on the board, so, depending on the size of the board, there are a lot ...
by Sven
Thu Aug 08, 2019 10:31 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: max number of pseudo legal move
Replies: 29
Views: 3063

Re: max number of pseudo legal move

Here is a fun one for you, a position with 205 best moves: 3Q4/R6Q/2Q4Q/4Q3/1Q4Q1/3Q4/Q4RNp/2BK1Nkq w - - The best moves are: Ba3 Bb2 Bd2 Be3 Bf4 Bg5 Kc2 Kd2 Ke1 Ke2 Ne1+ Nf4+ Nfe3 Ng3 Nge3+ Nh4+ Nxh2 Q3d4 Q3d5 Q3d6 Q3d7 Q6g7 Q7g6 Q7g7 Q8d4 Q8d5 Q8d6 Q8d7 Qaa1 Qaa3 Qaa4 Qaa5 Qaa6 Qab1 Qab2 Qab3 Qac...
by Sven
Wed Aug 07, 2019 2:30 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: msys mingw64 trouble
Replies: 9
Views: 954

Re: msys mingw64 trouble

It is annoying that Jumbo needs some CygWin DLLs at runtime. Therefore I am trying to switch to MinGW64 under MSYS2 64bit, expecting a way to build a standalone binary that does not require additional DLLs apart from Windows system DLLs. First step was to use MSYS gcc. Build worked fine, no problem...
by Sven
Tue Aug 06, 2019 8:00 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: msys mingw64 trouble
Replies: 9
Views: 954

Re: msys mingw64 trouble

I use msys2 instead of msys. I sometimes have problems with clang builds, but never with gcc. Is your project open source? If so I might try some experiments building it after I get back from vacation I use msys2, too, my whole description above was referring to msys2, I only missed the "2" in the ...