Search found 527 matches

by yurikvelo
Sun Dec 14, 2014 9:28 pm
Forum: Computer Chess Club: General Topics
Topic: which is better... Nd5 or Qe1...
Replies: 10
Views: 2086

Re: which is better... Nd5 or Qe1...

Stockfish 171114 @ D=35, 20 400 MN 1. +0.32: 18.Qe1 b5 19.a3 Rb8 20.Qh4 Rf8 21.Bf4 Bd8 22.Rad1 Qe7 23.Qg3 Rb7 2. +0.31: 18.a3 Bb7 19.Qe1 Nxf3 20.Bxf3 Bf8 21.Qh4 Bg7 22.hxg6 hxg6 23.Kg2 Re7 3. +0.21: 18.Nxe5 Nxe5 19.Rf2 b5 20.a3 Bb7 21.Qg1 Rf8 22.Rh2 Rae8 23.hxg6 Nxg6 ........... ~20. -2.67: 18.Nd5 e...
by yurikvelo
Sun Dec 14, 2014 9:23 pm
Forum: Computer Chess Club: General Topics
Topic: Syzygy on RAM Drive
Replies: 23
Views: 8659

Re: Syzygy on RAM Drive

If you don't use a RAM disk, upon access the relevant parts of the TB files will be cached into RAM anyway in an area called the "page cache". Once certain data is in the page cache it will stay there even between engine restarts, unless the OS needs the RAM for something else. This is done DURING ...
by yurikvelo
Sun Dec 14, 2014 7:47 pm
Forum: Computer Chess Club: General Topics
Topic: USB 3 Storage for Syzygy WDL files
Replies: 35
Views: 5844

Re: USB 3 Storage for Syzygy WDL files

These are sequential read/write speed. For Syzygy it's meaningfull. Latency (access time), I/O per second only matters. Compare to ATA interface (DMA), USB is CPU-intensive protocol, so expect more nps dropdown. Compare random vs sequential dropdown for Intel AHCI SATA vs USB 3.0 interfaces: Intel R...
by yurikvelo
Sun Dec 14, 2014 5:08 pm
Forum: Computer Chess Club: General Topics
Topic: which is better... Nd5 or Qe1...
Replies: 10
Views: 2086

Re: which is better... Nd5 or Qe1...

do you mean 18.Qe1 vs 18.Nxe5 ?

Because 18. Nd5 is simple blunder
by yurikvelo
Fri Dec 12, 2014 10:30 pm
Forum: Computer Chess Club: General Topics
Topic: An easy win... for engines
Replies: 27
Views: 4389

Re: An easy win... for engines

There are 9 winning moves for white, 3 draw and 73 loss. 2 moves are #7, 4 are #8, 2 are #10 and 1 is #24 Task can be harder. Starting position 1. Qxe8 As a black try to find a draw. Only 5 out of 73 moves lead to draw. (it is either 3-rep, or QQ vs Q where black can take white queen by stalemate en...
by yurikvelo
Wed Dec 10, 2014 10:11 am
Forum: Computer Chess Club: General Topics
Topic: Magnus Carlsen vs. iPad Air 2 - Who would win?
Replies: 66
Views: 15712

Re: Magnus Carlsen vs. iPad Air 2 - Who would win?

If that is true then that would still be about 10x faster than the top PC today. This numbers aren't comparable, because amount of work per 1 position is not known. Cost (ALU operations per 1 position) and value of 1 position analyzed falls into "Knowledge vs Speed" philosophy concept. https://ches...
by yurikvelo
Tue Dec 09, 2014 1:51 pm
Forum: Computer Chess Club: General Topics
Topic: Branching Factor of top engines
Replies: 79
Views: 26192

Re: Branching Factor of top engines

More data with newer engines and higher D http://pastebin.com/8mpdgPk8 Position from game http://tcec.chessdom.com/archive.php?se=7&st=4&ga=12 r2q1rk1/pb1n1ppp/1p2pn2/2b1P3/2B5/2N2N2/PP2QPPP/R1B2RK1 b - - 0 12 1. c4 e6 2. Nf3 d5 3. e3 Nf6 4. d4 Be7 5. Nc3 O-O 6. Bd3 dxc4 7. Bxc4 b6 8. O-O Bb7 9. Qe2...