Search found 807 matches

by JVMerlino
Thu Sep 24, 2020 11:40 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Test position for weak (~2500) engines
Replies: 5
Views: 2118

Re: Test position for weak (~2500) engines

Myrddin on 8 cores finds Rxd4 in 8 seconds, but then keeps waffling between Rxd4 and Rxe3. The score is never close to a draw, though, even after two minutes.
by JVMerlino
Mon Sep 21, 2020 11:15 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: 3 fold repetition scoring issue
Replies: 10
Views: 1753

Re: 3 fold repetition scoring issue

This is probably the easiest position I have. Your engine should avoid Qxa6 and Rxa6 as they both lead to an immediate 3-fold draw: [D]3r3N/R1p1kppp/n6n/8/2QPP3/5q2/5P1P/5RK1 w - - 0 24 Also, this is a classic position, but it is much harder for young engines to find: [D]1k6/4R3/1p6/p1p3p1/qnBn2Qp/5...
by JVMerlino
Sun Aug 16, 2020 12:51 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Laziest Lazy SMP
Replies: 12
Views: 4978

Re: Laziest Lazy SMP

Dann Corbit wrote:
Sun Aug 16, 2020 12:39 am
silentshark wrote:
Sat Aug 15, 2020 5:13 pm
So, here's my lazy question, what's the easiest way to create multiple processes and share memory between them, in the world of Windows?
Use CreateProcess.
You can almost simulate a fork with it.
Yep, that's how I did it in my code sample above.
by JVMerlino
Sat Aug 15, 2020 5:28 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Laziest Lazy SMP
Replies: 12
Views: 4978

Re: Laziest Lazy SMP

With the nasty legacy code I have (lots of global variables etc.), the multiple process approach might be the easiest thing for me to use. So, here's my lazy question, what's the easiest way to create multiple processes and share memory between them, in the world of Windows? And that's exactly the ...
by JVMerlino
Sat Aug 15, 2020 5:02 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Laziest Lazy SMP
Replies: 12
Views: 4978

Re: Laziest Lazy SMP

Results against TSCP: 1 thread on i7-6700 3.40GHz (4 cores) -----------------Plankton64_03----------------- Plankton64_03 - TSCP181c : 84.0/100 75-7-18 (=11=111=101=11=1110=1011111111==0=11111110=11=11=1111=1111=1111111111110111110111==1111=1=1111111111) 84% +288 -----------------TSCP181c----------...
by JVMerlino
Wed Aug 12, 2020 9:33 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Test Position for amateurs, humans, and even some stronger engines
Replies: 8
Views: 2425

Re: Test Position for amateurs, humans, and even some stronger engines

8/3r4/5p2/2k1nQ2/8/3p4/3K4/8 b - - This position came up in Halogen v Myrddin in a CCRL match. There is only one move that wins for Black. Myrddin failed to find it within the time control even with 5-man tablebases. :-( Stockfish-dev with pure NNUE eval (no hybridization) finds the correct move in...
by JVMerlino
Wed Aug 12, 2020 4:59 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Test Position for amateurs, humans, and even some stronger engines
Replies: 8
Views: 2425

Test Position for amateurs, humans, and even some stronger engines



This position came up in Halogen v Myrddin in a CCRL match. There is only one move that wins for Black. Myrddin failed to find it within the time control even with 5-man tablebases. :-(
by JVMerlino
Sat Aug 08, 2020 5:50 pm
Forum: Computer Chess Club: General Topics
Topic: Test Position
Replies: 14
Views: 2061

Re: Test Position

Even The King from CM9000 (of course, with only one thread) can find it in less than a minute: Time Depth Score Positions Moves 0:00 1/3 -3.52 1297 1.Kb1 Kg8 2.c3 0:00 1/3 -3.49 1523 1.a3 Nc6 2.Qxb5 Bxf2 0:00 1/3 -3.45 2262 1.c3 Qc6 2.Kb1 0:00 1/4 -3.26 4564 1.c3 Nxa2+ 2.Kb1 h6 3.Kxa2 hxg5 4.hxg5+ K...
by JVMerlino
Tue Jul 14, 2020 9:15 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: On-line engine blitz tourney July
Replies: 26
Views: 7176

Re: On-line engine blitz tourney July

Fun tournament, mine was with no opening book, no threads code and came in the bottom half on its first outing, but I quite liked this game (playing white). Not sure how sound was 12 Nxd4, the game flashes by too fast to analyse in real time, but I figured the exchange sac was on the cards at that ...
by JVMerlino
Fri Jul 10, 2020 9:23 pm
Forum: Computer Chess Club: General Topics
Topic: Other fun mates
Replies: 103
Views: 23254

Re: Other fun mates

Too late for black here [d] 8/pppk1p2/4pQ2/1r2P3/3P2p1/1PP2NP1/qn2KPP1/4R3 w - - 0 1 The good ol' King from 2002 sees Mate in 13 in four seconds: Time Depth Score Positions Moves 0:00 1/3 3.82 3528 1.Qxf7+ Kd8 2.Nd2 Qa6 3.Kf1 0:00 1/4 3.83 9522 1.Qxf7+ Kd8 2.Nd2 Qa5 3.Rh1 0:00 1/5 10.56 45935 1.Qxf...