Search found 158 matches

by elpapa
Fri Nov 18, 2016 1:25 pm
Forum: Computer Chess Club: General Topics
Topic: You make the call..
Replies: 32
Views: 5998

Re: You make the call..

Graham Banks wrote:Win to black, as it is still possible to mate with two knights with other material on the board.
Highly unlikely of course, but that's the official line.
This has got to be the correct answer. I voted black win as well.
by elpapa
Fri Nov 18, 2016 1:16 pm
Forum: Computer Chess Club: General Topics
Topic: A position almost every engine gets wrong
Replies: 16
Views: 2066

Re: A position almost every engine gets wrong

[d]3k4/K2Q4/8/8/8/8/8/8 b - - 0 1 There is no legal move... applicable FIDE rule :5.2b "The game is drawn when a position has arisen in which neither player can checkmate the opponent’s king with any series of legal moves. The game is said to end in a ‘dead position’. This immediately ends the game...
by elpapa
Thu Nov 17, 2016 12:33 am
Forum: Computer Chess Club: General Topics
Topic: Cursed win at TCEC
Replies: 296
Views: 247702

Re: Cursed win at TCEC

Evert wrote:There's simply no room for discussion.
And yet here we are on page eight.
by elpapa
Mon Nov 07, 2016 12:13 am
Forum: Computer Chess Club: General Topics
Topic: Official Stockfish 8 binaries removed from official site?
Replies: 2
Views: 788

Re: Official Stockfish 8 binaries removed from official site

Leto wrote:I was about to start my testing of SF8 x64 12CPU for CEGT 40/4 but https://stockfishchess.org/ has me downloading Stockfish 7 instead of Stockfish 8. Were the SF8 binaries removed?
I get SF8. Try refreshing or clearing cache.
by elpapa
Wed Sep 28, 2016 2:04 am
Forum: Computer Chess Club: General Topics
Topic: Perfect play
Replies: 37
Views: 7708

Perfect play

Strong engines playing each other draw more often than weak engines playing each other. Now, if we draw a graph (elo/draw%), find a best fit curve and extrapolate it, we should be able to estimate the strength of engines playing perfect chess (=100% draws). Does this seem reasonable? Has it been done?
by elpapa
Sat Sep 24, 2016 1:52 pm
Forum: Computer Chess Club: General Topics
Topic: am = h6, but what is bm?
Replies: 8
Views: 1417

Re: am = h6, but what is bm?

To late to edit, after ...h6, depth 38:

Bxh6: +0.44 for white
by elpapa
Sat Sep 24, 2016 1:34 pm
Forum: Computer Chess Club: General Topics
Topic: am = h6, but what is bm?
Replies: 8
Views: 1417

Re: am = h6, but what is bm?

SF 160827, multi-pv 4, depth 32:

h6: -0.62
h5: -1.56
Re8: -2.74
Qb6: -5.27

Edit:
And after ...h5, depth 38:

Ne4: +2.06 for white
by elpapa
Sat Sep 24, 2016 1:07 pm
Forum: Computer Chess Club: General Topics
Topic: How fast was the Cray?
Replies: 21
Views: 7166

Re: How fast was the Cray?

mar wrote:
OT: That chart has some flaws, 2 MFLOPS on Atari 2600?! Give me a break :)
1MHz 6502 (no FPU), 2 cycles minimum per instruction...
Yes, that is obviously way off. And no need to use math either, you just have to look at it. :D
by elpapa
Fri Sep 23, 2016 5:11 pm
Forum: Computer Chess Club: General Topics
Topic: How fast was the Cray?
Replies: 21
Views: 7166

Re: How fast was the Cray?

I found this chart comparing MFLOPS: http://pages.experts-exchange.com/processing-power-compared/ According to this, the original iPhone was slightly faster than a Cray-1, and an iPhone 6 is about 15 times faster than the first iPhone. The Tianhe-2 super-computer is almost 100 million times as fast ...
by elpapa
Mon Aug 29, 2016 9:06 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Nullmove bugs
Replies: 30
Views: 4695

Re: Nullmove bugs

if (depth >= 4 && nodetype != NodeTypePV && !incheck && PopCount(b->sidemask[b->side] > 2)) { [­/code] How did you come up with depth >=4? Depth >= 2 works best for me. Make sure you call qsearch when depth <= 0 and not depth == 0 if you make this change. Nullmove reduces by R + 1. My R is 3, so 3 ...