Author: m.d.hurd
Date: 01:38:24 02/09/04
Go up one level in this thread
On February 08, 2004 at 22:50:05, Mike Byrne wrote:
>If case you have not figured this out by now, my intent it to continue with
>posting all 11 of the Nolot positions, dig up the game score from the actual
>game -- post the orginal comments made by Pierre Nolot (original author of the
>article where these positions were discussed) and Feng-Hsiung Hsu, Deep Blue
>Inventor, who was preparing Deep Thought/Deep Blue for the match with Kasparov
>that was to come in 1995 and took a keen interest in these positions. He
>believed that if Deep Blue were able to solve these type of positions quickly,
>Deep Blue would have a very good shot at defeating Kasparov. It is interesting
>to see what today's software on fast hardware think of these positions.
>
>So far these posts have gone very well and I appeciate everyone who has
>particpated in this excercise.
>
>Nolot #3 is a semi-controversial position as there are many doubters that the
>claimed winning move is truly a forced win. When one also considers the nearly
>200 point in the ratings of the particpants, it easier to understand why the
>favored player, GM Sergey Smagin, now 47, played the daring and very complicated
>Ng5!?. I suspect he would not have played that move if he had been playing
>Kasparov. GM Dragutin Sahovic is now 63 years young and is still active in the
>Serbia & Montenegro Chess Federation.
>
>
>
>[Event "Biel (open) 50/122"]
>[White "Smagin,S"]
>[Black "Sahovic,D"]
>[Date "1990"]
>[Annotator "Smagin,S"]
>[WhiteElo "2550"]
>[BlackElo "2370"]
>[ECO "B 00"]
>[Result "1-0"]
>
>
>1. e4 Nc6 2. d4 d5 3. e5 ( 3. Nc3 {Ue 50/(122)} ) 3... Bf5 4. c3 e6 5. Nd2
>{N} ( 5. Ne2 ) 5... f6 6. f4 fe5 7. fe5 Nh6 8. Ndf3 Nf7 9. Ne2 Be7 10. Ng3
>Bg4 ( 10... Bg6 11. h4 $16 ) ( 10... g6 $5 ) 11. Bd3 {
>
>[d]r2qk2r/ppp1bnpp/2n1p3/3pP3/3P2b1/2PB1NN1/PP4PP/R1BQK2R b KQkq - 0 11
>
>I let Crafty 19.10 SE search about two hours just on this move - it was
>searching the 20th ply deep and was returning a draw score by an apparant
>repetition. Unfortuanately I had not saved the analysis and I do not feel like
>running the position again.
>
>}
>11....Ng5 12. Ng5 $3 ( 12.
>Bg5 Bg5 13. O-O $14 ) 12... Bd1 13. Ne6 Qb8 ( 13... Qd7 14. Bf5 $18 ) 14.
>Ng7 Kd8 ( 14... Kf7 15. Bh6 $5 ( 15. N7f5 Bg4 16. Nh6 ) 15... Bf8 16. O-O
>Kg8 17. N7f5 $1 17... Bg4 18. Rf4 $1 18... Bf5 19. Bf5 Nd8 ( 19... Qe8
>20. Bf8 $18 ) ( 19... Bh6 20. Be6 Kg7 21. Nh5 Kg6 22. Bf7 Kg5 23. h4 {#} )
>20. Be4 $3 20... Bh6 21. Bd5 Kg7 22. Nh5 Kg6 23. Rf6 Kh5 24. Bf3 Kg5 25.
>g3 $18 ) 15. Kd1 b5 16. Ne6 Kc8 17. Nf5 Bf8 ( 17... Qb6 18. Nf4 $5 18...
>Rd8 19. Ne3 $1 $16 ) ( 17... Kb7 18. Bb5 $36 ) 18. Rf1 $1 18... Kb7 (
>18... Qb6 19. Ne3 $5 $16 ) 19. Bh6 $3 19... Bh6 ( 19... Kb6 20. Ne3 $3 (
>20. Nf8 $14 ) 20... Bh6 21. Nd5 Ka5 ( 21... Kb7 22. Nc5 Kc8 23. Rf7 {#C5
>#CCf5+#BB} ) 22. b4 Ka4 23. a3 $1 23... Kb3 24. Nc5 Kb2 25. Rf2 $1 25...
>Ka1 26. Nb3 {#} ) 20. Nc5 Kc8 21. Nh6 Ne7 22. Be2 Ng6 23. Nf7 $1 {#5B#C5
>#CCg4##5D} ( 23. Nf7 $1 23... h5 24. Nh8 )
>1-0
>
>========================================================================
>Comment by Pierre Nolot, published in the July 1994 issue
>of Gambisco
>
>========================================================================
># Position: 3
># Move: W
>
>r..qk..r Smaguine - Sahovic, Bienne 1990
>ppp.b.pp White wins with a queen sac but black has several ways to defend
>..n.p... 12.Nxg5!! Bxd1 13.Nxe6 Qb8 14.Nxg7!! Kf8 15.Bh6! Bg4 16.0-0+
>...pP.n. 17.Kg8 17.Rf4 +-
>...P..b. It should take between a few months and a few years for a program
>..PB.NN. to find 12.Nxg5!!
>PP....PP
>R.BQK..R
>
>
>========================================================================
>Comment by Feng-Hsiung Hsu , Deep Blue Inventor
>========================================================================
>White to move
>
>8 R * - Q K * - R
>7 P P P - B - P P
>6 - * N * P * - *
>5 * - * P p - N -
>4 - * - p - * B *
>3 * - p b * n n -
>2 p p - * - * p p
>1 r - b q k - * r
>
> a b c d e f g h
>
>Source: Smagin-Sahovic, Biel 1990.
>
>Solution move is 1. Ng5!. Verified that the move is sound by following
>the published analysis, but could not play it within one hour time. This
>is more a positional sac than what would be normally called tactics.
>
>========================================================================
>Additional Comment by Feng-Hsiung Hsu , Deep Blue Inventor
>========================================================================
>
>We took a closer look at this position. 12. Ng5 is a sound positional
>sac, but depending on the temperament of the player, it might not be
>the best move. The published annotation gives 12. Bg5 Bg5 13. o-o as
>+=, but white could play 13. h3 instead and white appears to have a simple
>positional squeeze. The critical line in the 12. Ng5 variation turns out
>to be 12. Ng5 Bd1 13. Ne6 Qb8 14. Ng7 Kd8 15. Kd1. Black's queen and rooks
>are temporarily out of play, black is up a pawn, but white has a protected
>passed pawn, and lots of pressure. (The annotator gave one line that
>ended "with the attack":). From DT-2's point of view, The Bg5 line was
>gaining 0.20 pawn after each iteration, and so was the Ng5 line. Except
>that the Bg5 line has about a 0.20 pawn lead at the same depth. There
>appears to be no kill in the Ng5 line when black king goes to d8
>instead of the f file. Black would have to give up the extra pawn to
>activate the queen and the rooks, and while white is definitely better, black
>is not without counter play. On the deepest search that we checked out,
>black's evaluation stopped dropping at around -1.4 pawns, and black's pieces
>were becoming active.
New game
r2qk2r/ppp1b1pp/2n1p3/3pP1n1/3P2b1/2PB1NN1/PP4PP/R1BQK2R w KQkq - 0 1
Analysis by Shredder 8 Gambit:Athlon 2400xp, 256 mb hash.
1.Bxg5 Bxg5 2.0-0 0-0 3.Bc2 g6 4.Qd3 Bf4 5.Rae1 Ne7 6.Qb5 Rb8 7.Qc5 Bxf3 8.Rxf3
Bxg3 9.hxg3
² (0.64) Depth: 16/36 00:01:49 37336kN
(Hurd, UK 09.02.2004)
Mike
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