Author: Robert Hyatt
Date: 20:50:21 02/01/00
Go up one level in this thread
On February 01, 2000 at 20:23:36, Vincent Diepeveen wrote: >On February 01, 2000 at 13:40:59, Eugene Nalimov wrote: > >>In his lecture at MS Murray Campbell said several words about Nxe6. It was added >>to DB opening book by GM Benjamin after he found that DB understands position >>after that move. Unfortunately, I don't remember exact words - either "DB liked >>the position after Nxe6", or "DB would like to play Nxe6 even by itself". > >Nah back in 1997 already there were basically only wins with Nxe6 lines, >except a fritz3 game i think or something, >so it was considered bad and all automatic generated books have Nxe6 as >only playable move there. That's still the case... >...knowing deep blue always used a big automatic generated book (info >from Bob this is at least) i doubt whether they needed Benjamin for that. What are we talking about now? DB had (apparently) a huge book similar to my book. They had a small hand-tuned by GMS type book just like I do. Except that their 'small' book is _far_ larger than my small book... > >Deep Blue would not have played Nxe6. Score before is positive for white >above 0.20, after Nxe6 it is under -0.20 for white. This is wrong. at shallow depths it is low. At depth 8(6) it is zero. and at depth 9 it might have been even better as it changed its mind right at the last minute if I read the output correctly. It doesn't seem that it dislikes white after Nxe6 at all. > >First 13 plies to my surprise diep doesn't play Nxe6 either, though >score is just within hundreds of not playing it i saw some sooner this day. > >> >>Eugene >> >>On February 01, 2000 at 08:48:31, Vincent Diepeveen wrote: >> >>>Hello, >>> >>>For years i've been wondering why Kasparov played h6?? in the last >>>game against deep blue. It is for sure that Kasparov knew that h6?? was >>>a bad line after Nxe6! >>> >>>Kasparov has said several things about this game, all crap what he says >>>in my eyes. Latest explanation of him i heart being said on the internet >>>was that Kasparov with his excellent memory and as a professional and >>>young player had forgotten it and hastely played h6 thinking it would be >>>transposition anyway. >>> >>>Now i found that already very unlikely. See here my big surprises when >>>checkingout the log files of Deep Blue. >>> >>>I figured out that Deep Blue had thought already about moves before this! >>>Even though some moves were from book, the moves Nxe4 and Bd3 especially >>>there deep blue lost like 6 minutes of time somehow. Kasparov must have >>>thought deep blue was out of book! >>> >>>Some moves that were made quickly by deep blue Kasparov must have thought >>>there that they were predicted correctly by the computer, which was in fact >>>true. the move e6 was in fact predicted correctly. >>> >>>Now first we can clearly deny that kasparov hastely played h6 by accident. >>>The log file shows clearly that kasparov has thought nearly 93 seconds about >>>making h6. >>> >>>Now for the average player 93 seconds in opening might mean he just drank >>>a bit of his tea, but Kasparov who plays theorem always within a second, >>>has given this position over a minute of thought. >>> >>>That can mean only one thing! >>> >>>Kasparov OBVIOUSLY knew both lines. He KNEW h6 was bad. He KNEW Bd6 was good. >>> >>>He MIGHT have considered deep blue out of book. It is very unlikely that >>>deep blue would have played Nxe6. The score is -0.20 after the sacrafice >>>and before that it is about +0.20, so over 0.40 pawn difference between Nxe6. >>> >>>Of course Nxe6 was in book. Log file clearly show that. >>> >>>Kasparov made Qe7 directly. Within 20 seconds. If Kasparov had forgotten >>>the Nxe6 line he would have been in shock for at least quite some time. >>> >>>Kasparov was not. So kasparov WILLINGLY risked the Nxe6 line. He very likely >>>must have thought in that 1 and a half minute before deciding to move h6 >>>about that he already had a chance that deep blue would NOT capture at e6, >>>after which black is fine. If deep blue WOULD capture, nah then kasparov was >>>a piece up, like in previous games deep blue might simply allow queen exchange >>>after which kasparov was a piece up and would win chanceless. >>> >>>Let's not call Kasparov too many words, but he sure was arrogant underestimating >>>the computer in an open position. He sure was ignorant about the aggressive >>>tuning of deep blue and he sure was naive risking Nxe6 and not even blinking >>>when the program played it. >>> >>>Vincent
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