< Earlier Kibitzing · PAGE 12 OF 12 ·
|Dec-07-17|| ||WorstPlayerEver: <frogbert>
Sure enough S8 has trouble to find this moves: it goes beyond their evaluation. Which is traditionally still too based on materialistic grounds. It doesn't recognize the pattern of the position. Which comes down to King safety.
My objection stands corrected though, I think. The Black S8 positions are often more than just passive. Withdrawn is an appropriate term, I suppose.
The e5 vs c6/e6 ingredient/locked Black LSB/king side attack, White Queen has hands free/open d-file for White.
All managed through nice pawn sacs.
It's almost like sac sac mate ;)
|Dec-07-17|| ||john barleycorn: I have a strong feeling that the whole thing was manufactured in one way or the other. Has Kasparov been involved?|
|Dec-07-17|| ||frogbert: <Hence, we're left with the line 23... Qh6 24. Re8 Qf6 25. Rae1 Kg8 26. Rxf8+ Qxf8 27. Qd4! and white is again winning.>|
And here, my Stockfish doesn't find the important move 27. Qd4 within one minute - and Qd4 actually works due to a second piece sacrifice (Bd5+). :)
I hope everyone realizes that AlphaZero also does a tree search during play - MCTS or Monte Carlo Tree Search simulations - which is more costly for each node in the tree; hence, the huge difference in number of positions examined per second between AZ and S.
|Dec-07-17|| ||Marmot PFL: Komodo seemed listless and out of form in some games against Houdini too. Even computers have bad days I suppose, and the programmers go through the opponents games, looking for weaknesses to exploit.|
|Dec-07-17|| ||WorstPlayerEver: <frogbert>
You are right. I proved very little today.
But hey, except from rather cramped opening ideas, I always stated there's -far-
more to chess than everyone thought. My infectuous optimism may well have contributed to this h.. I mean revolutionary developments. Who knows.
Or maybe I am a little on the narcissistic side?
|Dec-07-17|| ||Domdaniel: <Worst> That's good. It's only when you reach the *very* narcissistic point, where optimism is quashed, that things get problematic.|
|Dec-08-17|| ||keypusher: < WannaBe: I have only (quickly) played game 1 from the PDF file, so a quick glance at FEN of game 5 - move 20, I see similarity to game 1:
1. White have no center pawn(s)
2. (Somehow) black got its pieces in the A8 corner(?!!?)
Don't think any human player would get him/herself into that kind of position...>
Kasparov vs Marjanovic, 1980
|Jan-10-18|| ||scholes: Current sf dev version now 50 elo stronger than sf8. Halfway to alphazero ☺️|
|Jan-26-18|| ||chesslab0: Dear chessfriends, the 19th (already) FICGS correspondence chess WCH waiting list is now open, all tournaments should start on March 1st, 2018... Stockfish and Houdini are kind of required here :) ... and yes, after all these years GM Eros Riccio is still FICGS correspondence chess champion!|
If you're IM or GM (basically rated over 2350) and used to chess engines, you may get the opportunity to enter the knockout tournament to reach the candidates final. We really need the participation of the strongest corr. chess players to shake the crown, join the fun :)
You can replay the games of the 14th WCH final match here:
By the way, for more convenience FICGS now has applications for Android that you can find here:
|Feb-01-18|| ||scholes: Stockfish 9 released. 60 elo stronger than sf8 in self test. Would be more in rating list due to new contempt in sf9. Stockfish has 20 as default contempt. Use 0 contempt for analysis unless you what it does.|
|Feb-03-18|| ||zanzibar: SF download page:
Apparently an early release got out, somewhat mistakenly:
(Thanks <scholes> for that tip - but aren't the parameter settings the responsibility of whatever UCI interface one is using?)
|Feb-03-18|| ||zanzibar: Oh, wait, the engines can be run stand-alone too, though I rarely do that.|
Was the contempt setting then changed between v8 and v9?
|Feb-03-18|| ||scholes: Yes in jan 2018 it was changed from 0 to 20. Largest contempt value which doesn't causes regression.|
No you a chess hui does not change uci parameters by default. Only a user can change it.
|Feb-03-18|| ||zanzibar: <scholes> I run SCID, and it's gui has a UCI configure engine dialogue box.|
When I run it with SF9 it comes up with Contempt = 0.
Is there any method for testing what Contempt setting an engine really is running with other than looking at the UCI configure window?
PS- I disagree with the statement that only a user can change it - as the gui's can store settings and send them to the engine at startup. I haven't looked at the details of the code - so I don't exactly who does what, when.
|Feb-03-18|| ||zanzibar: <scholes> Apologies - but my previous post is in error, probably because I didn't properly do the SF8 to SF9 upgrade.|
Redoing it you were right, the SF9 engine does have the new Contempt setting by default when first starting. SCID's UIC config dialog can be used to reset it, and thereafter use the new setting (I put it back to 0).
|Apr-14-18|| ||HeMateMe: stock up!
<Stockfish is the winner of the Top Chess Engine Championship (TCEC) Season 11. The open source engine by Marco Costalba, Joona Kiiski, Gary Linscott and a huge community of contributors, defeated last year’s champion Houdini and crowned itself the new Grand Champion of the competition.
This is the third title for Stockfish, after the victories in Season 6 and Season 9. However, this time Stockfish created history by winning the title in a one of a kind landslide victory. After 85 games Stockfish had the necessary 50,5 points (18 victories, 65 draws, and only two losses), with 15 games to spare the title was in the hands of the open source engine.>
|Apr-26-18|| ||Penguincw: Love the profile pic.
Stockfish 9 recently played a match on lichess.org vs. Neural Network AI Leela Chess Zero ID:185, which is similar to AlphaZero.
Here are the games and more: https://www.youtube.com/watch?v=tpk....
|May-18-18|| ||oolalimk1: in the last 21 games here Stockfish did not win a single game.|
|Aug-11-18|| ||Penguincw: Norwegian Stockfish 160518 finishes tied for 1st at the TCEC Season 12 - Premier Division tournament, with 24.5/39.|
|Nov-30-18|| ||WorstPlayerEver: Congrats on your 10th anniversary!|
|Nov-30-18|| ||scholes: sf 10 released
|Dec-10-18|| ||Telemus: Stockfish is quite strong, but it seems to be difficult to analyse with it. See what I mean.|
SF 10 evaluates the starting position at depths 25-30 as favouring White: at least +0.57. But if I execute its favourite move (e4), then - at the same depths - the evaluation is close to 0.00, several times even negative. The same observation holds for many opening positions and I oberved it already with SF 9.
Did anybody else notice that SF enjoys to have the move so much? And how shall I analyse with it?
I also like evaluation profiles of whole games (e.g. https://uscfsales.wordpress.com/201...). But if I use SF for evaluation it varies from ply to ply so often by 50+ centipawns, although the best move was played. In these cases the impression one gets from the profile is absolutely misleading.
|Dec-10-18|| ||zanzibar: <<Telemus> Did anybody else notice that SF enjoys to have the move so much? And how shall I analyse with it?>|
I've made similar observations/comments several times in the past.
It's misleading because of aggressive adaptive pruning, or so I believe, where SF seems to be getting stuck in a local min/max.
Playing a given move forces it to explore that move to a similar depth, seeding the cache properly, if returning to original position.
Some people have suggested not trusting SF at least than a depth of 40-ply or more, which puts it outside the powerband of my laptop for definitive analysis.
I still use it, put try to walk through the actual game moves to seed a position before letting it really simmer the pot/position.
|Dec-10-18|| ||Molotok: <Telemus> This is a feature called contempt which adds some amount of centipawns to evaluation so that the engine tries to avoid draws by picking slightly "worse" positions that let the game continue. It was to counter the old weakness of SF8 that had the tendency to quickly accept draws against much weaker opponents and was introduced in SF9. I think you can at least turn it off for analysis by switching "analysis contempt" option to "off".|
|Dec-11-18|| ||Telemus: <zanzibar> <Molotok> Thank you very much for your replies!|
<Molotok: contempt> That worked!
Stockfish describes the parameter as follows:
<option name Contempt type spin default X min -100 max 100>
where X = 24 for SF10, X = 20 for SF9, and X = 0 for SF8. (Looks like the default behaviour for analysis vs play was changed from SF8 to SF9.)
In my old Chessbase GUI one can set this parameter during engine installation (it failed to change it for an existing engine).
In general, a GUI has to send the UCI command
<setoption name Contempt value 0>
< Earlier Kibitzing · PAGE 12 OF 12 ·