Search found 119 matches

by Pio
Mon Jan 13, 2020 3:34 pm
Forum: Computer Chess Club: General Topics
Topic: 1.g4 opening is losing?
Replies: 79
Views: 7140

Re: 1.g4 opening is losing?

But what do you think Harvey? Is g4 defensible? If so, at what point did I go from drawing to losing? I think g4 is probably losing. I think possibly another move 2 could be worth a try. Uri posted analysis somewhere that according to Stockfish 2. c4!? Is worth a look. I can’t find any games where ...
by Pio
Tue Jan 07, 2020 10:08 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: RMO - Randomized Move Order - yet another Lazy SMP derivate
Replies: 113
Views: 6346

Re: RMO - Randomized Move Order - yet another Lazy SMP derivate

Vondele did an interesting experiment : I implemented 5 versions (drafts: https://github.com/vondele/Stockfish/commits/threadDepth) v1: Master version: all threads search irrespective of Limits.depth, mainThread stops search when it reaches limits depth. v2: First thread to reach Limits.depth stops...
by Pio
Thu Jan 02, 2020 4:16 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Goofy
Replies: 3
Views: 412

Re: Goofy

In this position Bb5 looses a piece after c5-c4. Skipper does not see that. So you can't reduce pawn moves. [d] rnbq1rk1/pp2ppbp/5np1/2pp4/2B5/2N1PN2/PPPP1PPP/R1BQ1RK1 w - d6 0 7 13 +0.07 13.7M 1:44.08 c4b5 12 -0.05 9.10M 1:07.25 c4e2 b8c6 e2b5 a7a6 b5e2 c8d7 e2d3 c6b4 d3e2 d7f5 d2d3 f5d7 11 -0.06 ...
by Pio
Fri Nov 29, 2019 10:05 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Pawn move generation in bitboards
Replies: 3
Views: 475

Re: Pawn move generation in bitboards

Hello all, I try to modify my engine to use Bitboards (currently 10x12 board representation) and I am stuck in understanding what is the most efficient for pawn move generation. I have a U64 representation for all the pieces on the board I have a U64 pawn representation for one side For every bit s...
by Pio
Thu Aug 22, 2019 8:50 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: What the heck happens here?
Replies: 12
Views: 2929

Re: What the heck happens here?

Can someone please explain what dendrograms show? They try to show the similarities between different engines. The more similar they are the closer they should be in the diagram. But you should not take the picture as the truth because the similarities are dependent on the metric used and the clust...
by Pio
Thu Aug 22, 2019 8:22 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: PVS, window, and mate
Replies: 20
Views: 3643

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 Pio
Tue Aug 20, 2019 8:03 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: What the heck happens here?
Replies: 12
Views: 2929

Re: What the heck happens here?

I took the Sim tester which has some 8,000+ quiet positions with unclear best move and tested engines, including versions of Lc0 nets, all at 1 second / position and additionally SF_dev at much longer 10s/position and 30s/poisition. Also, for some check, one Lc0 at 0.2s/position. Hardware: 4 i7 cor...
by Pio
Wed May 22, 2019 3:41 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Possible "real" hash collision
Replies: 27
Views: 4912

Re: Possible "real" hash collision

I probably gave the topic a bad title ... hash collision is most always a fantasy. Here Minic is probably more struggling with a lot of delaying checks and miss evaluate everything as a draw score thanks to repetition. But the plan for black is quite simple, put the two rooks on the 7th rank (to gr...
by Pio
Sat Jan 05, 2019 11:09 pm
Forum: Computer Chess Club: General Topics
Topic: Who is winning?
Replies: 3
Views: 636

Re: Who is winning?

Hi! I wonder who is winning here. I believe it is black but it seems Stockfish thinks otherwise. r3kr2/ppn5/3p4/2pPP1q1/2P1P2p/P1NB2p1/1P2Q3/R3B1K1 w q - 3 25 Not sure why you would doubt Stockfish. Cfish-dev says: +8.51 25. exd6 h3 26. Bd2 Qh4 27. Be3 O-O-O 28. e5 Rd7 29. Rf1 Rdf7 30. Rxf7 Rxf7 31...
by Pio
Sat Jan 05, 2019 10:14 pm
Forum: Computer Chess Club: General Topics
Topic: Who is winning?
Replies: 3
Views: 636

Who is winning?

Hi!

I wonder who is winning here. I believe it is black but it seems Stockfish thinks otherwise.

r3kr2/ppn5/3p4/2pPP1q1/2P1P2p/P1NB2p1/1P2Q3/R3B1K1 w q - 3 25