Search found 3724 matches

by MikeB
Fri Jul 10, 2020 4:53 am
Forum: Computer Chess Club: General Topics
Topic: test for pruning
Replies: 11
Views: 1154

Re: test for pruning

I have been looking recently at this position from an offline game: 4r3/5pk1/1q1r1p1p/1p1Pn2Q/1Pp4P/6P1/5PB1/R3R1K1 b - - Black played f5! and won. Arasan did not anticipate this move. It looks like excessive pruning is making it "blind" in this position. I have recently pushed a fix that scales ba...
by MikeB
Thu Jul 09, 2020 4:28 am
Forum: Computer Chess Club: General Topics
Topic: Other fun mates
Replies: 81
Views: 7628

Re: Other fun mates

White was winning here [d] 6r1/6P1/4P1R1/8/2p5/2Kp2B1/4k3/8 w - - 1 47 but played the bad move ... [d] 6r1/6P1/4P1R1/8/2K5/3p2B1/4k3/8 b - - 0 47 Now black will promote and "soon" mate ... and white had a mate-in-12 info depth 43 seldepth 26 multipv 1 score mate 12 wdl 1000 0 0 sp 1000 nodes 186354...
by MikeB
Thu Jul 09, 2020 4:26 am
Forum: Computer Chess Club: General Topics
Topic: Other fun mates
Replies: 81
Views: 7628

Re: Other fun mates

White was winning here [d] 6r1/6P1/4P1R1/8/2p5/2Kp2B1/4k3/8 w - - 1 47 but played the bad move ... [d] 6r1/6P1/4P1R1/8/2K5/3p2B1/4k3/8 b - - 0 47 Now black will promote and "soon" mate ... Indeed ... info 60 seconds info depth 64 seldepth 9 multipv 1 score cp 9998 wdl 1000 0 0 sp 1000 nodes 8800341...
by MikeB
Thu Jul 09, 2020 3:32 am
Forum: Computer Chess Club: General Topics
Topic: Stockfish sewing machine
Replies: 25
Views: 745

Re: Stockfish sewing machine

A famous study by Blathy (declared in the study as mate in 58): 1n6/k2p4/p1pPp3/P1P1Pp2/5p2/5P2/2P2P2/4K3 w - - You can find it on Yacpdb: https://www.yacpdb.org/#search/MW42azJwNHAxcFBwM1AxUDFQcDI1cDI1UDIyUDJQMjRLMy8vLy8vLy8vLy8vLy8vMS8xLzEvMA==/1 Now, the pecular thing here is that analyzing it w...
by MikeB
Wed Jul 08, 2020 6:25 pm
Forum: Computer Chess Club: General Topics
Topic: Cfish is back!
Replies: 20
Views: 901

Re: Cfish is back!

Ronald has brought Cfish back in sync with Stockfish-dev. Both have "bench signature" 4882833. https://github.com/syzygy1/Cfish Next step Cfish-NN :D That can wait until after Ronald has time for Cfish-NonLazySMP. :wink: Cfish doesn't support LazySMP? So there is C++ code in LazySMP??? I would assu...
by MikeB
Wed Jul 08, 2020 4:54 pm
Forum: Computer Chess Club: General Topics
Topic: How did this happen? SF says +154 and draw.
Replies: 22
Views: 628

Re: How did this happen? SF says +154 and draw.

<snip due to charactor limits> Something seems very wrong. I used a GUI that correctly sends the full move chain (beginning from startpos) to UCI engines. And Stockfish-dev showed mate scores for at least five moves. If I recall, I saw mate-in-30 with Qd5+. I'll run this again, since now I'm thorou...
by MikeB
Wed Jul 08, 2020 3:26 pm
Forum: Computer Chess Club: General Topics
Topic: XI-r3 Release
Replies: 35
Views: 1427

Re: XI-r3 Release

I tested more and the bug is present in command line also. Try this position with 1 core with Black Diamond XI-r3 : 2bq1rk1/rpb2p2/2p1p1p1/p1N3Np/P2P1P1P/1Q2R1P1/1P3P2/3R2K1 w - - 0 1 And from depth 1 to depth 20 several strange values appear : -2415, -2418, -2424 ... in depth 27 also: info depth 2...
by MikeB
Wed Jul 08, 2020 2:30 am
Forum: Computer Chess Club: General Topics
Topic: How did this happen? SF says +154 and draw.
Replies: 22
Views: 628

Re: How did this happen? SF says +154 and draw.

Hmm, a MultiPV=8 search implies there are 7 moves still winning, also Qd6 ... (1 Thread, 512 GB Hash, syzygy-6) info depth 57 seldepth 56 multipv 1 score cp 15401 wdl 1000 0 0 nodes 974738899 nps 1571867 hashfull 1000 tbhits 39469258 time 620115 pv e6d5 b7b6 d5a2 c8c7 d7e6 c7c8 a2a5 b6c6 a5a6 c6c7 ...
by MikeB
Tue Jul 07, 2020 8:01 pm
Forum: Computer Chess Club: General Topics
Topic: XI-r3 Release
Replies: 35
Views: 1427

Re: XI-r3 Release

I tested more and the bug is present in command line also. Try this position with 1 core with Black Diamond XI-r3 : 2bq1rk1/rpb2p2/2p1p1p1/p1N3Np/P2P1P1P/1Q2R1P1/1P3P2/3R2K1 w - - 0 1 And from depth 1 to depth 20 several strange values appear : -2415, -2418, -2424 ... in depth 27 also: info depth 2...
by MikeB
Tue Jul 07, 2020 5:26 am
Forum: Computer Chess Club: General Topics
Topic: XI-r3 Release
Replies: 35
Views: 1427

Re: XI-r3 Release

All flavors available for Windows, Linux and macOS. https://github.com/MichaelB7/Stockfish/releases/tag/XI-r3 What's New ? +11 Elo in self testing - which means that is the cap and real Elo gain will be less than that. Totally rebased ( rebuilt from the ground up) to current- dev Stockfish. Some as...