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Jul-16-10
 | | Eisenheim: 41... NF3 - even if they make this a Sunday puzzle and me seeing the solution, I don't think I'll get it! |
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| Aug-31-10 | | Tal rules: <whiteshark> Stockfish also thought that Nxb2 was superior to Nd3, because otherwise it would have played 50. Kb3 rather than Kxb4. |
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Aug-31-10
 | | Once: 41...Nf3!!
Sometimes I play through a game and boggle at a particularly spectacular move. The kind that you just know you wouldn't find OTB without a big flashing neon arrow miraculously (and rather implausibly) appearing over the board. And then a sad realisation dawns that I will never ever be a grandmaster. Today's game, and the star move 41...Nf3, tells us that we will never ever be computers either. 41...Nf3 leaves just about every black piece en prise. Okay, it doesn't put the black bishop en prise, but black is going to sac that a few moves later anyway. I suppose the point is that humans apply a common-sense filter when we are checking for candidate moves. We automatically home in on the likelieswt moves and don't even glance at the obvious duds. This common-sense approach is something that is very hard to program. By contrast, the computer looks at every move, good and bad alike. Except today the star move is one of the "obvious duds" that most mortals would dismiss instantly. That is, if they even considered it at all. An enjoyable GOTD, to be sure. |
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| Aug-31-10 | | dortam888: 50.Nd3!? Kxb4 Nxb2 Rxb2 and material even. 50.Nxc2! and the white queen isn't able to protect the knight so he must go back with his king to defend the knight (or attack the black knight) now 51.Kc3?? b4! and king must go to b3 (or Kd3 Ne1# or horibble queen sac) 52..Ne1+! 53.Ka2 (or Kxb4 and Nd3 takes the queen)53..Nd3! and white loses his Knight or his Queen. so Kb3 is must now rybka is one pawn lead with a free C pawn (the queen and knight exacha were crucial or he loses his knight or more pawns)and then come the move that ends the game 55..g3! if black takes he loses both of the pawns and rybka has it's F pawn free and if black play f3 than we all see what happend (he lose both of the pawns in exchange to the free C pawn and then G become Queen) |
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| Aug-31-10 | | e4knightf3: whiteshark: "and here I'm wondering why the maschine didn't choose the fork and grab the queen with <50...Nd3+> and 51...Nxb2."
- in response to the fork question - it seems black gets his material back and maintains strong advantage whereas the R+N vs Q gives a lesser one (maybe?). - but even so, can't understand why 51..Nxe3+ was chosen over 51..Qxd2 winning the N. Yes black has a resulting N-pin with Q's on either side but surely black can find some checks and get out of it and enter the end game with the N (and Q's traded off). |
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Aug-31-10
 | | kellmano: <- but even so, can't understand why 51..Nxe3+ was chosen over 51..Qxd2 winning the N. > I think you've got the king in the wrong place. After 51......Qxd2, you'd see 52. Qxc2 with material parity. |
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| Aug-31-10 | | pers0n: we see Rybka play really well here but in games against players like Nakamura it needlessly plays losing moves when it can easily draw. |
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Aug-31-10
 | | Marmot PFL: Rybka is always a step ahead of these clones. |
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Aug-31-10
 | | crazybird: <Marmot PFL: Rybka is always a step ahead of these clones> Some say Rybka itself was a clone |
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Aug-31-10
| | Marmot PFL: The clone can never be better than the original, and Rybka is always #1. |
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Aug-31-10
 | | OhioChessFan: Love the underpromotion to Rook. I didn't know computers could also say "It's time to resign". |
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Aug-31-10
 | | kevin86: A crazy game;the underpromotion is a pixieish ending. The stockfish syndrome:when the losing computer identifies with the winner. lol |
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| Aug-31-10 | | pers0n: don't computers try playing 'correct' chess? 'correct' chess would have meant a promotion to a queen, not rook. |
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Aug-31-10
| | Once: I think computers play whatever kind of chess their programmers tell them to play. Which means that some programmer has a wicked sense of humour - to program Rybka to play an underpromotion if it leads to the same result as a promotion to queen. |
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| Aug-31-10 | | desiobu: f1=R. Brilliant. |
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| Aug-31-10 | | hstevens129: The combo begins at 41...Nf3. Incredible depth of calculation. |
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Aug-31-10
 | | Phony Benoni: Perhaps Rybka underpromoted because there wasn't another queen handy. |
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| Aug-31-10 | | garrykasparov: Promotion to a Rook or Queen wouldn't really matter. |
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Aug-31-10
 | | waustad: Underpromotion is a common feature if you look at the "preferred" lines from stockfish or rybka. If the piece will be taken immediately it usually picks a lower value one or if it doesn't matter, like here, it will usually pick the weaker one. Watching games in chessbomb or chessok one sees this often. |
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| Aug-31-10 | | eykca: <Phony Benoni: Perhaps Rybka underpromoted because there wasn't another queen handy.> It's the simple humor in life... thank you Phony, I needed that. |
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| Jan-07-12 | | patzer777: Well also you see a lot of cases wherein the lesser piece is needed in order to avoid a stalemate, but will still get the job done. The designers probably figure that it's better to be safe than sorry. |
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Jan-07-12
 | | AylerKupp: There may have been a change in Rybka's evaluation function since 2009 when going from version 3 to version 4. Starting from the position after 77.Ka4, the current version (Rybka 4.1) promotes the f-pawn to a queen regardless of whether tablebases are enabled or not. Too bad, the game continuation made it more interesting. I should add that with tablebases disabled Rybka 4.1's PV#1 goes 77...f1=Q 78.Ka3 Qfa6# but its PV#2 goes 77...f1=R 78.Ka3 Ra1#, just like the game. I guess that, mate notwithstanding, Rybka's evaluation function shows an advantage in material at the end if it promotes to a queen rather than a rook and therefore chooses the queen promotion over the rook promotion! |
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| Jan-07-12 | | Penguincw: Sigh. More underpromotion. Computers seem to like to do so. |
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| May-20-13 | | iamsheaf: 41 .. Nf3 could very well be one of the best combinations ever played on a chessboard |
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May-20-13
 | | PaulLovric: what about 50...Nxc2+, is that a mistake? 50...Nd3+ forking the queen seems like a better move at first glance??? |
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sac: 43...Qh2