Author: Steve Schooler
Date: 10:38:55 10/03/99
Go up one level in this thread
On October 03, 1999 at 12:51:55, Bruce Moreland wrote:
>
>Please provide the position you refer to.
>
>bruce
My original post mistakenly said game 5 ... apologies
[Event "IBM Kasparov vs. Deep Blue Rematch"]
[Site "New York, NY USA"]
[Date "1997.05.04"]
[Round "2"]
[White "Deep Blue"]
[Black "Kasparov, Garry"]
[Opening "Ruy Lopez: closed, Smyslov defense"]
[ECO "C93"]
[Result "1-0"]
1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6
8.c3 O-O 9.h3 h6 10.d4 Re8 11.Nbd2 Bf8 12.Nf1 Bd7 13.Ng3 Na5 14.Bc2 c5
15.b3 Nc6 16.d5 Ne7 17.Be3 Ng6 18.Qd2 Nh7 19.a4 Nh4 20.Nxh4 Qxh4
21.Qe2 Qd8 22.b4 Qc7 23.Rec1 c4 24.Ra3 Rec8 25.Rca1 Qd8 26.f4 Nf6
27.fxe5 dxe5 28.Qf1 Ne8 29.Qf2 Nd6 30.Bb6 Qe8 31.R3a2 Be7 32.Bc5 Bf8
33.Nf5 Bxf5 34.exf5 f6 35.Bxd6 Bxd6 36.axb5 axb5 37.Be4 Rxa2
38.Qxa2 Qd7 39.Qa7 Rc7 40.Qb6 Rb7 41.Ra8+ Kf7 42.Qa6 Qc7 43.Qc6 Qb6+
44.Kf1 Rb8 45.Ra6 1-0
The remainder of this post is an excerpt from (Web posted) Game 2 - Annotations
by GM Yasser Seirawan. Apparently, the controversy centers on Whites 37th move
(or a subsequent White move).
============================== E X C E R P T ==========================
34.exf5 f6?
Bad luck for Kasparov. A move that would have been a goodie several turns
ago fails to address the needs of the position now. Although it is
important to prevent White from playing f5-f6 it was equally important to
prevent an invasion on the Queenside dark squares by Qf2-b6. The only move
to prevent both was 34...Qd8 also protecting the d6-Knight.
35.Bxd6 Bxd6 36.axb5!
Deep Blue plays the precise sequence of captures. GM Lubosh Kavalek offered
the interesting sacrificial line: 36.Qb6 Rd8 37.axb5 Rab8 38.Qxa6 e4 with
counterplay on the dark squares as compensation for the two lost pawns.
36...axb5 37.Be4!?
A controversial move. The text prevents any active ideas based on ...e5-e4
- as in the previous note - at the cost of failing to strike while the iron
is hot. I considered 37.Qb6! Rxa2 38.Rxa2 Bc7 39.Qe6+ Qxe6 40.dxe6 as
leading to a winning ending by force. Still, it must be argued that after
the text, Black's endgame is simply miserable.
37...Rxa2 38.Qxa2 Qd7 39.Qa7 Rc7?
When it rains it pours. This was simply not Kasparov's day. Clearly Black
has a very difficult struggle to save the game, but, one thing is for sure,
he can't save the game with Queens on the board as it is White's Queen that
is far more powerful. In fact the text is based on an oversight. Garry had
to put his hopes into an endgame based on Bishops of opposite colors. While
the endgame may be lost, Kasparov had to pin his hopes on 39...Qxa7 40.Rxa7
Rc7 41.Ra6 Rd7 42.Rb6 Kf7 43.Rxb5 Ke7 when Black has jettisoned a pawn in
hopes of keeping a blockade.
40.Qb6 Rb7 41.Ra8+ Kf7(?)
In the post match conference, Deep Blue considered this to be Kasparov's
fatal error. After 41...Kh7 Deep Blue thought that Black could still fight.
I'd disagree as Black's King would be far out of the game.
42.Qa6 Qc7 43.Qc6! Qb6+ 44.Kf1! Rb8
This was the position that Garry had been aiming for hoping for the line:
45.Qd7+ Kg8 46.Ra7 Bf8 when Garry could aspire for ...Qb6-e3 with
counterplay. He had simply missed Deep Blue's next move.
45.Ra6!
Now the auditorium's audience was a buzz. For some time the commentators,
IM Maurice Ashley and IM Michael Valvo were quickly coming to the
conclusion that 45...Qxc6 46.dxc6 Bc7 47.Ra7 Rc8 48.Bd5+ and Bd5-e6 was
lost for Kasparov. The desperate attempt 45...Qe3 46.Qxd6 Qxe4 (46...Qf4+
47.Bf3; 46...Qc1+ 47.Ke2 Qb2+ 48.Kd1 stops the perpetual) 47.Ra7+ Kg8
48.Qxb8+ picks up Black's Rook with check. What was Garry's Defense? He had
none and extended his hand in resignation. The applause rocked the
auditorium! Folks we have a match! A superb game by Deep Blue and its team,
my hearty congratulations for a brilliant effort!
1-0
Postscript by Yasser
...
Let's take a look at the variations:
In the final position Garry has the miracle shot 45...Qe3
abandoning the protection of the d6-Bishop. White has two tries:
a) 46.Qxd6 and b) 46.Qd7+. I had refused to believe in chessic
miracles due to 46.Qxd6 when I thought the win was straight
forward: 46...Re8! 47.Bf3 and now with a little nifty King and
Bishop two-step, White's King waltzes to safety. Due to the
threat of Bf3-h5+, Black has to keep up a series of checks:
* a) 46.Qxd6 Re8! 47.Bf3 Qc1+ 48.Kf2 Qd2+ 49.Be2 Qf4+ 50.Ke1
Qc1+ 51.Bd1. Now comes my mistake in my original analysis.
Convinced that Black had to keep up the continuous stream of
checks I had concluded that 51...Qe3+(??) was necessary and
this indeed does lead to a win for White after 52.Kf1 Qf4+
53.Kg1 Qe3+ 54.Kh1! and White wins.
However, Black need not play 51...Qe3+ but instead has the
continuation 51...Qxc3+! 52.Kf1 Qc1! when there is no way for
White to avoid the perpetual check.
So are things that simple? Not quite. After 46...Re8! White can
try to avoid perpetuals with the inspired move 47.h4 the idea
being that in some lines White can run his King to the g3-square
and not face the cold blooded ...Qf4 checkmate as a response.
Black should not be bluffed and by responding 47...h5! the same
type of perpetual checks exist and the game again is drawn. In
this line, it is important that Black avoids capturing the
e4-Bishop as can be seen: 47.h4 Qxe4?? 48.Ra7+ Kg8 49.Qd7 Qf4+
50.Kg1 Qe3+ 51.Kh2 Qf4+ 52.Kh3 Qe3+ 53.g3 and White secures his
victory.
So, in fact after 46.Qxd6 Re8! the game is drawn. Murray Campbell
of IBM's Deep Blue team confirmed the above and stated that the
final position was a draw. Besides, these variations there is the
second try for White:
* b) 46.Qd7+ (Instead of capturing the d6-Bishop) 46...Kg8!
(After 46...Be7?? 47.d6 Qxe4 48.Qe6+ Kf8 49.dxe7+ leads to
checkmate by force.) 47.Qxd6 Rf8 and once again we have
variations that are very similar to the "a)" lines listed
above leading to perpetual checks.
Shocking and true!
...
Apparently over the course of the free day, Garry had spent a
great deal of time deeply analyzing the play of Deep Blue in game
two. He had come to some mind bending conclusions. Let us follow
Garry's thought patterns as he himself described them:
1) A fabulous game by the computer, extraordinary positional and
strategic moves that showed an astonishing amount of
sophistication. The first indication of something truly
sensational, the move Re1-c1. (And indeed this was a special
move.)
2) An extraordinary decision by Deep Blue to play Bc2-e4 when
Qf2-b6 forces the win of material AND keeps all the positional
advantages. Garry, working with several pc-programs had analyzed
Qf2-b6 to an astonishing depth of 25 ply and could find no way to
save the game. How could a computer refuse the win of material
which leads by force to a winning position in favor of a
positional move. Garry opined that only, "...Anand, Kramnik,
Ivanchuk and but a few others" would have taken the same course
as Deep Blue and eschewed the win of material. (Again, I too was
befuddled by this decision. How could the computer decline the
win of material?)
3) How could Deep Blue "blunder" a winning position into an
"elementary" draw by perpetual check which was only 8 or 10 ply
deep?
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