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Garry Kasparov vs Deep Junior (Computer)
FIDE Man - Machine WC (2003), New York, NY USA, rd 5, May-02
Nimzo-Indian Defense: Normal Variation. Bishop Attack Classical Defense (E48)  ·  1/2-1/2



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Kibitzer's Corner
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Feb-05-03  coxschess: 9. a3 was probably simply to get black out of book.

Fritz 8 after nearly 4 and one half hours of thought considers white better after 16. g3!

Analysis by Fritz 8:

1. ± (0.84): 16.g3 Nh2+ 17.Kf2 Ng4+ 18.Ke1 Qh3 19.Rg1 Nd7 20.e4 dxe4 21.Nxe4 Ndf6 22.Nxf6+ Nxf6 23.Kd1 Bg4 24.Re1 Qxg3

From a stand-point of computer play this game is revolutionary!! A piece sac for a speculative attack with no material compensation! Amazing. But I think its unsound and Kasparov should have played the strongest move 16. g3! He was afraid he missed something most likely. Hard to imagaine the greatest player of all time scared, but he seems to be.

Feb-05-03  BrianLedsworth: Giuoco Piano Man, White is lost after Kg1, due to Qh5. Then mate cannot be stopped.
Feb-05-03  mdorothy: <Giuoco Piano Man:> I think after 12. Kg1 Qh4 white has two options to protect: Re1 and Rd1. 13. Re1 leads to 13...Qxf2 14. Kh1 Rxe3!! where the threat is 15...Rh3 16. Pxh3 Qh2#. Trading the bishop for the rook leaves the mating square g2 too poorly defended. I saw the line once if 13. Rd1 when I was looking through things, but I took too long and I can't remember it.
Feb-06-03  Bears092: Chessmaster 9000 says 18. g3! is about a +2.
Feb-06-03  jbao: From the above computer analysis, black 24. Qxg3 losing the Queen is absolutely radiculus !!! It shows the horizon problem, where the search depth is set to low. Black is definitely better after 16.g3 With 7 hours of analysis, you have:

16.g3 Nh2+ 17.Kf2 Ng4+ 18.Ke1 Qh3 19.Rg1 Nd7 20.e4 dxe4 21.Nxe4 Ndf6 22.Nxf6+ Nxf6 23.Kd1 Bg4 24.Re1 Ng4f2+ (-0.54 by Junior 7).

Feb-06-03  greco1620: Deep Junior played not like a comp program, but like a human. 8...Bd6 and then 10...Bxh2 are moves that comp don't play. 16.g3 for Kasparov is so unclear that he could not affort to risk. Kasparov is the best human player and if he thought 16.g3 would not work, I think he must have been right. After all the difference between human's and comp, in chess is, that humans get tired. Comp don't and in cases like the one arisen here, always find the best lines for their games. In game six, I think Kasparov will win with black nad his beloved Sicilian. He'll get Deep Junior soon out of book and then he'll beat the program. If he wants to just draw game six, he'll stay in book, where in his sharp Sicilian he'll force a draw.
Feb-06-03  alhine: 9.a3 defies rational analysis after 8...Bd6 with no white knight on f3. The h2 sac is blatantly obvious. Its incomprehensible that K would spend a tempo like this. 10.Qc2 isn't much better. Either 10.Ng3 or the concessionary 10.f4 seems better, although the latter deprives a knight from that square and weakens e3. I'm disappointed but I have hope K will go all out and play for a win with Black in game 6.
Feb-06-03  coxschess: jbao there seems to be something wrong with your analysis.

Firstly 24...Qxg3 in the Fritz analysis doesnt lose the Queen as the Knight on e2 is pinned by the Bg4.

Secondly the line you give 24...Ngf2+ is not legal because the lone black knight is now sitting on f6 after the knight exchanges on moves 22. There is no knight on g4 to give a check on f2.

Feb-06-03  jbao: After 24...Qxg3,
25.Kd1-c1 Qg3-f2 26.Re1-h1 h7-h6 27.Ne2-c3 Qf2xd4 28.Bd3-f5 Ra8-d8 29.Bf5xg4 Nf6xg4 30.f4-f5 Ng4-e3 31.Bd2xe3 Qd4xe3+ = (-0.23) Depth: 14 31588kN
Most programs think that white is winning after 16. g3 because of the horizon problem, they don't see black's compensation for the material loss. It doesn't pay off until 15 to 20 moves later.
Feb-06-03  coxschess: I tend to agree that after 24...Qxg3 the game is about equal

I set the position back up on Fritz 8 after whites 24. Re1 in the analysis above (see my previous post)

In this line and it suggested both sides take a draw (after 30 mins thought): 24...Qh2 25. Bb4 (or 25. Bc3) 25...Re3 26. Bd2 Re8 27. Bb4 Re3

Whites only chance to play for a win is then 22. Nd6!? in Fritz 8 analysis, but this also levels out and it is white who must be on the defensive the entire time. One slip and its good-bye Garry.

Here is that analysis:

22...Re6 23. Nc4 Nd5 and Now after 30 minutes thought Fritz 8 gives:

1. ± (1.22): 24.Be4 Qh2 25.Rh1 Qf2+ 26.Kd1 Rh6 27.Re1 b5 28.Nc3 Bd7 29.Bxd5 cxd5 30.Ne5 Nxe5 31.dxe5 Rc8 32.Qd3

However from this position after a further 30 minutes thought Fritz 8 considers 32...Bg4+ best for black.

33. Ne2 Rh2

And after a further 20 minutes thought considers 34. a4 =

It appears a draw is likely in all of these lines with PERFECT defense by white and he would be under considerable pressure the entire time.

In the end it seems Kasparov was justified in taking the draw.

Feb-07-03  coxschess: Decided to check out this line of Fritz more deeply:

I let Fritz 8 continue analysis in the above line after 34. a4 for 9 hours and he gives a edge to black now:

(-0.69): 34...Rc4 35.Qe3 Qg2 36.e6 fxe6 37.Rc1 d4 38.Qe5 d3 39.Rxc4 bxc4 40.f5 dxe2+

I find it difficult to believe Deep Junior saw all this from move 10 but his speculative sacrifice certainly puts white under the knife.

The main alternative is 34. b3 this now seems best--preventing the rook invasion at c4

I Let Fritz look at this overnight and after 9 hours got the following line:

(-0.72): 34...d4 35.e6 fxe6 36.Rc1 Rd8 37.Rc7 Qf3 38.Qxf3 Bxf3 39.Ba5 d3 40.Rxg7+

After 40...Kxg7 41. Bxd8 Kg6 42. Ba5 Rxe2+ 43.Rxe2 dxe2 44. Bc7 Kf5 45. Be5 Kg4 46. Ke1 black has an extra pawn, a passed pawn on the 7th rank that needs constant attention, and the superior king position. Whites has compensation however in the bishops of opposite color ending that results.

For example 46...a5 (46...Kxg3 47. f5+=) 47. b4 axb4 48. axb4 h6 49. Kf2 Kh3 50. Bg7 h5 51. Bc3 and white should draw. I give the remainder example analysis for instructive purposes 51...Bg4 52. Bd2 h4 53. gxh4 Kxh4 54. Bc3 Bh5 black can make no progress 55. Be5 Kh3 56. Bd6 Bf3 57. Be5 Kg4 58. Bd6 Kf5 59. Be5 Ke4 60. Ke1 Ke3 61. Bd6 Be4 black can never make progress. It's a bishops of opposite color ending draw.

While such deep analysis is not necessary Fritz original suggestion of 16. g3!? trying to play for a win only manages to draw from an inferior position with best play. White is under incredible pressure the whole time and could easily lose. Again Kasparov's instinct to take the draw was unquestionably best.

Feb-08-03  alhine: To coxschess: Your final comment that "Kasparov's instinct to take the draw was unquestionably the best" underscores clearly that 9.a3?? was a horrendous blooper. I didn't need Fritz or any computer to see that. Of course, I'm assuming that K with the white pieces, was playing for the win.
Feb-09-03  coxschess: I thought I might as well add this.

A Master friend told me in the line:
16.g3 Nh2+ 17.Kf2 Ng4+ 18.Ke1 Qh3 19.Rg1 Nd7 20.e4 dxe4 21.Nxe4 Ndf6 22.Nd6! Re6 23. Nc4 Nd5 He prefers 24. Ne5

I had to go out of town Saturday night so I set the game up on Fritz 8 and after 23 hours of thought he gives the following analysis after 24. Ne5

Analysis by Fritz 8:

1. ± (1.16): 24...Qh2 25.Bxh7+ Qxh7 26.Qxh7+ Kxh7 27.Nxg4 Rxe2+ 28.Kxe2 Bxg4+ 29.Kf2 Kg6 30.Rae1

2. +- (1.47): 24...Re8 25.Be4 Qh2 26.Rf1 Ndf6 27.Bf3 Be6 28.Qd3 g6 29.Rh1 Qf2+

White looks better here. Kasparov said he had analyzed the game extensively and thought that white was a little better after 16. g3 but still difficult so perhaps this was the line he was looking at.

Feb-20-03  HAZRIZ: HEY sucks I wan't to play chess games hurry up my time i limited now hurry.......and i wan't to play chess amedekly and you do give me playing chess i wan't to kill you now.......are you understand
Feb-20-03  ughaibu: No I dont understand.
Jul-23-04  InspiredByMorphy: <HAZRIZ> You may have better luck getting your message across if you speak in English.
Jul-23-04  InspiredByMorphy: 10. ... Bxh2 doesen't look like a computer move. Impressive.
Dec-13-04  Backward Development: so this is the infamous bishop sac, eh? very interesting computer move. just read a big sale piece about this program on and this game is pretty impressive.
Feb-15-05  SimonBrazil:
Dec-25-06  crazy monk: Must be a homeprep of DJ and the Israel team which shock Kaspy. Nice move!.
Dec-14-07  hitman84: Nice intuitional sacrifice from Deep Junior.

Could someone post Rybka eval after Bxh2+.

Dec-14-07  hitman84: <1. ± (0.84): 16.g3 Nh2+ 17.Kf2 Ng4+ 18.Ke1 Qh3 19.Rg1 Nd7 20.e4 dxe4 21.Nxe4 Ndf6 22.Nxf6+ Nxf6 23.Kd1 Bg4 24.Re1 Qxg3 >

Kasparov was afraid of 16...Qh2!

Dec-14-07  hitman84: If this game was really home prep then Junior would have played Bxh2+ straight away. I don't know how long it thought before playing that move.

During this match everything was kept secret. The eval output was not shown even after the game.

Jun-11-08  wvkevin: Extremely interesting game. Looks like the computer took Tal's advice (Sacrifice first, then calculate later) on the 10th move, apparently good enough for perpetual check against the "former" World Champion. Could Gazza had improved on his play, thus resulting in black's making an unsound sacrifice?
Oct-06-09  RandomVisitor: After 16.g3 <Qh2> 17.Rae1 g6 18.e4 Nd7 19.e5 or 19.Bc1 white plans Nd1, forcing the black queen to retreat, then Ne3.
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