Although compared with AZ it's an "old fashioned" engine, it's still monstrously strong, and getting steadily stronger. On the contrary, I think the AZ match had the opposite effect for most of the Stockfish developers. Please continue to give us your feedback and suggestions on how we can help make /r/chess better for everyone. Use the message the moderators link if your posts or comments don't appear, or for help with any administrative matters.
Twitter/Facebook posts must contain a direct link to the tweet/post, and include the author's nameĬhess Spoiler format for problem answers etc., Instructions for /r/chess PGN addon ( Chrome, Firefox)ĭon’t engage in abusive, discriminatory, or bigoted behavior.ĭon't ask for advice about ongoing games.ĭo not use /r/chess exclusively to promote your own content. These openings might still be viable in human play, but the keyword here is "human play" objectively they are subpar and against an opponent armed with engines you are asking for trouble.News Puzzles Games Strategy Twitch Other Resources High book exits can lead to wins, which of course bodes badly for the engine that has the worse position out of the opening. Low book exits will lead to boring draws. Nevertheless, there are also some lines with a lower book exit, especially in the theoretically interesting lines. As mentioned above, book exits are significantly higher compared to season 16 and before, to keep the games interesting and avoid boring draws. Book exits have been checked with classical Stockfish (development version, contempt = 0) on a 16 core Ryzen system and Leela Chess Zero v0.26.0, with the net that played in the TCEC 18 superfinal. The complexity of a position and the book exit evaluation are the most important selection criterions. If you ever include these lines in the opening book of an engine tournament, be prepared for viewers to start talking about how you've chosen these lines to make the engine with Black lose.Įdit: since some people were unconvinced about the role book exit plays in opening selection, see this article by Jeroen Noomen (who selects the openings used in the Top Chess Engine Championship, the unofficial world computer chess championship): In short, if you are Black, interpret the book exit evals as: Nf3 f6? (Damiano Defense): +1.9Īs you can see, you have to play some pretty terrible lines to get > +1.5 book exit. Pawn odds (White starts without f2-pawn): -1.5.Bd2 b5 (see TCEC Season 18 superfinal game 8): +0.74 That's very likely going to lead to a 1-0, 1-0 game pair.įor illustration, here are some Stockfish evaluations of known bad lines: But: even these engine tournaments do not usually start with book exit lines of +1.5. That's why it is disproportionately represented in the opening book for engine tournaments - it gives great chances for one engine to outplay the other.
That said, it's worth pointing out that the King's Indian is a difficult, unbalanced opening that even computers don't understand perfectly. It doesn't matter what human analysis thought of the line before the advent of computers - if you go into these lines today, and your opponents are armed with engines, you are asking for trouble. If you are getting +1.5 book exit, you've gone into some dubious territory. Do note that the starting position of the KID, 1. The answer is effectively the same: White has roughly a +0.5 advantage in the starting position, and a shift of a few centipawns one way or another is acceptable, but if that advantage has grown to +1.5 there's a problem.
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