25 years ago: Deep Blue beats Kasparov

by André Schulz
2/11/2021 – 25 years ago, on February 10, 1996, Deep Blue became the first chess computer to beat a reigning World Champion in a game under tournament conditions. This happened in the first Kasparov vs Deep Blue match, the first big "Man vs Machine" match. Despite his loss in the first game Kasparov still won the match 4-2, but one year later, 1997, he lost the rematch against Deep Blue.

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Computer beats World Champion

On March 1, 2021, the German Post will issue a special stamp "Deep Blue beats Kasparov". The stamp commemorates the first game of the first "Deep Blue vs Kasparov" match, in which the IBM machine became the first chess computer to beat a reigning World Champion in a game under tournament conditions. This happened on February 10, 1996.

 
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1.e4 Keene Borik c5 2.c3 Alapin. This was not unexpected, since at first glance it looks like a good choice for the computer. Kasparov is one of the world's leading experts in the main line of the Sicilian, so it is natural for the Deep Blue team to select a solid line which is not directly in the mainstream. d5 Drawing gasps from the audience and the commentators. This move opens up the center and plays into the kind of position computers normally love. But Garry has prepared something specific for the machine. 3.exd5 Qxd5 4.d4 Nf6 5.Nf3 Bg4 6.Be2 e6 7.h3 Bh5 8.0-0 Nc6 9.Be3 cxd4 10.cxd4 Bb4! Normally 10...Be7 would be considered, keeping the bishop as a defensive piece for the black king. But Garry has studied this line carefully and is prepared to do open battle against Deep Blue. 11.a3 Ba5 12.Nc3 Qd6 13.Nb5 Qe7 14.Ne5 Bxe2 15.Qxe2 0-0 16.Rac1 Rac8 17.Bg5 Bb6 18.Bxf6 gxf6 19.Nc4! Rfd8 Naturally not... 19...Nxd4? 20.Nxd4 Bxd4 21.Qg4+ and White wins a piece. 20.Nxb6 axb6 21.Rfd1 f5 22.Qe3 Qf6
23.d5! Kasparov was taken completely by surprise. This is the kind of positional sacrifice computers are not supposed to play. Later we found that by sheer brute force Deep Blue had calculated that it could win back the pawn by force. 23.Qg3+ Kh8 23...Qg6?! 24.Nd6 Rg8 25.Qc3! Rcd8 26.Nxf7+! Qxf7 27.d5+± Fritz4 23...Rxd5 23...exd5 24.Qxb6 Qxb2 25.Qxb7 Rb8 26.Qxc6 Rxb5 26...Qxb5 27.Qf6± 27.Rc3 threatening Rg3+ f4 28.Rcd3± 24.Rxd5 exd5 25.b3! The computer is playing excellent moves. It is clear that the pawn on b6 cannot escape its fate. A human player might have played the rote 25.b4, but that allows a knight outpost in some lines after Nc6-e5-c4. Kh8 Kasparov goes for mate! He is playing too aggressively and adopts the wrong plan against a machine which looks at 100 million positions per second. 25...d4? 26.Nxd4± 25...Qe6 26.Qd2! followed by Rc1 with ample compensation for the pawn. 26.Qxb6?? Nd8!-+ 25...Ne7!? 26.Rxc8+ 26.Qg3+ John Nunn Qg7 26...Qg6 27.Rxc8+ Nxc8 28.Qb8 Qc6 29.Na7 Qc1+ 30.Kh2+- 27.Rxc8+ Nxc8 28.Qc7 Qf8 28...Qa1+ 29.Kh2 Kg7 30.a4! 29.b4 there are other good moves Qe8 30.Qxb7 looks promising for White 26...Nxc8 27.Qe8+ Kg7 28.Qxc8 Qa1+ 29.Kh2 Qe5+ 30.g3 Qe2 31.Qxf5 only move to avoid perpetual check Qxb5 and probably drawn. 25...Rd8! 26.Qxb6 Rd7 should hold the game quite easily. 26.Qxb6 Rg8 27.Qc5 Naturally not... 27.Qxb7 Qg5 threatening mate and forking the rook on c1. 27...d4? Better was probably... 27...Qg5 28.g3 Qd2 protecting the weak d-pawn. 29.Qc3+ 29.Nd6 Deep Blue would have played this and thought White has a slight edge. 29...Qxc3 30.Rxc3 Rd8 31.Rd3 Kg7 leads to a draw. 28.Nd6 f4 29.Nxb7 Time Magazine's correspondent Charles Krauthammer wrote: "Deep Blue's king was under savage assault by a World Champion. Any human Any human under such assault by a world champion would be staring at his own king trying to figure out how to get away. Instead, Deep Blue ignored the threat and quite nonchalantly went hunting for lowly pawns at the other end of the board. In fact, at the point of maximum peril, Deep Blue expended two moves - many have died giving Kasparov even one - to snap one pawn. It was as if, at Gettysburg, General Meade had sent his soldiers out for a spot of apple-picking moments before Beckett's charge, because he had calculated that they could get back to their positions with a half-second to spare. In humans, that is called sangfroid. And if you don't have any sang, you can be very froid. But then again if Meade had known absolutely - by calculating the precise trajectories of all the bullets and all the bayonets and all the cannons in Pickett's division - the time of arrival of the enemy he could, indeed, without fear, have ordered his men to pick apples. Which is exactly what Deep Blue did. It had calculated every possible combination of Kasparov's available moves and determined with absolute certainty that it could return from its pawn-picking expedition and destroy Kasparov exactly one move before Kasparov could destroy it. Which it did. It takes more than nerves of steel to do that. It takes a silicon brain. No human can achieve absolute certainty because no human can be sure to have seen everything. Deep Blue can." Ne5 30.Qd5 f3 31.g3 Nd3 To give you an impression of the volatility of the position let us take a look at some of the lines Kasparov had to consider: 31...Qf4 threatening Rxg3+ and Qxc1 32.Kh2? 32.Rc8‼ Qg5 33.Rc5! and White has everything under perfect control. However, if White instead had played 33.h4?? he would have run into a mating net: Rxc8‼ 34.hxg5 Rc1+ 35.Kh2 Ng4+ 36.Kh3 Nxf2+ 37.Kh4 Rh1# 32...Rxg3‼ and Black mates: 33.Rc8+ Rg8+ 34.Kh1 Rxc8 35.Nc5 Qc1+ 36.Kh2 Qg5 37.Qxe5+ Qxe5+ 38.Kh1 Qg5 39.Ne6 Qg2# 32.Rc7 32.Rc6? Rg5 is unclear (Hsu) 32...Re8 32...Nf4!? 33.Qxf7 33.Qxf3 Deep Blue thought this gave White a large advantage. 33...Nxh3+ 34.Kf1 Qxf7 34...Qa6+ 35.Rc4 and Qxf3 35.Rxf7 Ng5 36.Rd7 Rc8 with chances of saving the game. 33.Nd6 Deep Blue goes for the most ruthless win. Normal players would have opted for 33.Qxf7 Re1+ 34.Kh2 Qxf7 35.Rxf7 with a comfortable win for White. 33...Re1+ 34.Kh2 Nxf2 Kasparov is one move from mating the computer. But of course Deep Blue has calculated everything to the end. 35.Nxf7+ Kg7 35...Qxf7 36.Qd8+ Kg7 37.Rxf7+ Kxf7 38.Qd5+ Ke7 39.Qxf3 is an easy win for White. 36.Ng5+ Kh6 37.Rxh7+ and Black resigned, because of 37.Rxh7+ Kg6 38.Qg8+ Kf5 39.Nxf3 after which Black's mate threat has disappeared and his is hopelessly behind on material.
1–0
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WhiteEloWBlackEloBResYearECOEventRnd
Comp Deep Blue-Kasparov,G27951–01996B22Philadelphia m1

Spiritus rector of the Deep Blue project was the programmer Feng-Hsiung Hsu. He and Murray Campbell started the project at Carnegie Mellon University. Later, Jerry Brody and Joe Hoane joined them. In 1989, the team took the project to IBM, where development continued under the direction of Dr Chun Jen Tan. One of the ideas was to significantly increase the speed of calculations by parallelising CPUs.

In 1993, experts at the ACM (Association of Computing Machinery) believed that a search depth of 14 half-moves could beat the best human players. In 1996, the IBM team thought their programme was sophisticated enough to challenge the reigning World Champion Garry Kasparov to a match. Kasparov's opponent was a colossus which was about two metres tall, weighed 700 kilograms, and could calculate 200 million positions per second. However, the "computing monster" was invisible to Kasparov.

The match between the supercomputer and Garry Kasparov took place in Philadelphia from 10 to 17 February – at least for the public. Kasparov sat at the Convention Center in Philadelphia in front of a chess board, and an operator transmitted the moves of the World Champion via keyboard to a computer. Then, the moves were sent via a telephone line to Yorktown Heights, New York State, where Deep Blue was calculating. After the machine had decided what to do, its move was sent back to Philadelphia and the operator made it on the board.

In his preparation for the match, Kasparov had considered ten different opening concepts with lines he usually did not play, because he assumed that the computer team had prepared their machine well for his usual openings. Kasparov's sparring partner was the ChessBase Windows program Fritz 4. In many training games against Fritz 4 the World Champion tried the openings he might want to play and then decided which of the lines he would actually use.

In the first game, Kasparov decided to play his favourite opening, the Sicilian. In the first two games he wanted to get to know the computer, preferably in the area he knew best himself. After the first game, however, Kasparov was very impressed by Deep Blue's playing strength, particularly by the move 23.d5! which he thought was a typical human move. After the defeat Kasparov spent a somewhat sleepless night and reconsidered his match strategy.

Basically, however, the strategy was clear. The battle had to be fought with long-term plans that the computer could not calculate. With subtle transpositions in the openings, Kasparov also quickly threw his opponent out of the opening library and made the machine calculate for itself as early as possible.

Kasparov then managed to win the second game after six hours of play with a strategically complicated Catalan and the World Champion became confident again. In the end Kasparov won the match 4:2. He won three games and two games ended in a draw.

Kasparov-Deep Blue 1996

 
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1.Nf3 Keene Borik d5 2.d4 c6 3.c4 e6 4.Nbd2 Nf6 5.e3 c5 a tempo-losing move to deviate from game four. The Deep Blue team has prepared a line that should open up the position. 6.b3 Nc6 7.Bb2 cxd4 8.exd4 Be7 9.Rc1 0-0 10.Bd3 Bd7 11.0-0 Nh5? A very strange move which absolutely nobody at the site liked. 12.Re1 Nf4 13.Bb1 Bd6 14.g3 Ng6 15.Ne5 Rc8 16.Nxd7 Qxd7 17.Nf3 Bb4 18.Re3 Rfd8 19.h4 Nge7 20.a3 Ba5 21.b4 Bc7 22.c5 Four consecutive pawn advances which drive back all the black pieces, which are stumbling over each other on the queenside. Re8 23.Qd3 g6 24.Re2 Nf5 25.Bc3 h5 26.b5 Keene calls this "Kasparov's strategy of strangulation" and points out that 26.b5 doesn't just attack the knight but establishes "a giant, crawling mass of white pawns, rather resembling a colossal army of soldier ants on the move." Nce7 27.Bd2 Kg7 28.a4 Ra8 29.a5 a6 30.b6 Bb8
Kasparov has shut the black bishop and rook out of play to the end of the game. Black's position is lost. 31.Bc2 Nc6 32.Ba4 Re7 33.Bc3 Ne5 actually accelerating the end. 34.dxe5 Qxa4 35.Nd4 Nxd4 36.Qxd4 Qd7 IM Otto Borik that other variations also lose: 36...Qxd4 37.Bxd4 and Rb2, c6 wins, e.g. Re8 38.Rb2 Rc8 39.c6 Rxc6 40.Rxc6 bxc6 41.b7 Ra7 42.Bxa7 Bxa7 43.b8Q Bxb8 44.Rxb8 36...Qc6 37.Bd2 Rd7 38.Bg5 Kf8 39.Bf6 and now f3, Rg2 and g4 wins. 37.Bd2 Re8 38.Bg5 Rc8 39.Bf6+ Kh7 40.c6! bxc6 40...Rxc6 41.Rec2 Rxc2 42.Rxc2 Qe8 43.Qc5 wins 41.Qc5 Kh6 42.Rb2 Qb7 43.Rb4! And the Deep Blue team reseigned for the machine. Why did Black resign? IM Malcolm Pein explained this on the Internet: "Black has four pieces left plus his king. The rook on a8 and the bishop on b8 cannot move. If the queen on b7 moves it allows b7, winning a rook. If the rook on c8 moves White can play Qxc6, forcing an exchange of queens. After that there are many ways to win, the most prosaic being double on the c file and play Rc8. So we are left with Kh7! The simplest way then is Qe7 Qxe7 Bxe7 threatening b7 and if Rc8-e8 then b7 Ra7 Bc5 etc. Note that had Kasparov left his rook on b2 Black would have ... Bxe5 gaining a tempo." 43.Rb4 Qd7 43...Re8 44.Qxc6 Qxc6 45.Rxc6 Kh7 46.b7 Ra7 47.Rbb6 Rg8 48.Rc8 d4 49.Rbc6 g5 49...d3 50.Rxg8 Kxg8 51.Rc8+ Kh7 52.Rh8# 50.Rxg8 Kxg8 51.Rc8+ Kh7 52.Rh8+ Kg6 53.Rg8+ Kf5 54.f3 Threat: Rxg5# Bxe5 55.Bxe5 Threat: ditto Kxe5 56.b8Q+ and mate. 43...Kh7 44.Qe7 Qxe7 45.Bxe7 Re8 46.b7 Ra7 47.Bc5 Rd8 48.Bxa7 Bxa7 49.Rxc6 Bb8 50.Rc8 winning 44.b7
1–0
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WhiteEloWBlackEloBResYearECOEventRnd
Kasparov,G2795Comp Deep Blue-1–01996D30Philadelphia m6
Comp Deep Blue-Kasparov,G27950–11996C47Philadelphia m5
Kasparov,G2795Comp Deep Blue-½–½1996D46Philadelphia m4
Comp Deep Blue-Kasparov,G2795½–½1996B22Philadelphia m3
Kasparov,G2795Comp Deep Blue-1–01996E04Philadelphia m2
Comp Deep Blue-Kasparov,G27951–01996B22Philadelphia m1

The decade between 1996 and 2006 was an exciting time for the development of chess computers and computer programmes, and the "man versus machine" battle of wits captivated not only chess enthusiasts. Within their calculating horizon the machines made no tactical mistakes, but beyond their horizon they were practically blind, while humans could pursue long-term plans.

And the computers still fell for tricks, such as the small opening transpositions Kasparov used. But today, 25 years later, even world class players hardly have a chance against the programs. In 1996, thousands of spectators watched the match in the Philadelphia Convention Center, and several million followed the games on the internet, which was still in its infancy at the time.

Kasparov-Deep Blue, 1997

In 1997, a rematch took place, which attracted even more attention. Deep Blue had been further improved and this time Kasparov won the first game, but then resigned a drawn position in the second game. Kasparovs tried with all his might to win the match, but in the sixth game he went for a line in the Caro-Kann Defence that was considered to be bad if White was willing to sacrifice material. However, Deep Blue "knew" the refutation, sacrificed material, and won the game and the match.

 
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1.e4 Granda Zuniga c6 As in game 4. Will Garry use the same hybrid system again? Wie in Partie vier. Will Garry das gleiche Hybridsystem wiederverwenden? 2.d4 d5 No: Garry switches openings and opts for a genuine Caro-Kann. An opening less suited to Garry's playing style could hardly be imagined, but at least he is very familiar with it, having had many clashes with his old rival Karpov, albeit on the other side of the board. Nein, er wechselt die Eröffnung und wählt eine echte Caro-Kann-Verteidigung. Eine Eröffnung, die weniger zum Kasparov-Stil paßt, kann man sich kaum vorstellen. Aber zumindest kennt er sie einigermaßen gut, denn er hat sie in zahlreichen Begegnungen mit seinem alten Rivalen Karpov gespielt - allerdings auf der anderen Seite des Brettes! 3.Nc3 dxe4 4.Nxe4 Nd7 5.Ng5 Ironically, Deep Blue uses the same system which Kasparov used to play himself against Karpov. Eine Ironie des Schicksals, daß Deep Blue das gleiche System benutzt, das Kasparov gegen Karpov anwandte. Ngf6 6.Bd3 e6 7.N1f3 h6? But Karpov never played like this! This move forces White to sacrifice a piece, but the resulting attack is so dangerous that there are almost no human players willing to take Black's side. This line seems particularly inadvisable against a computer: a wide-open position, tactical ideas on all sides and a vicious attack for the silicon monster. 7... Bd6 is normal. So hat Karpov aber nie gespielt! Dieser Zug zwingt Weiß, eine Figur zu opfern, der entstehende Angriff ist aber so gefährlich, daß es kaum noch menschliche Spieler gibt, die das mit Schwarz spielen. Die Variante ist besonders unangebracht in Partien gegen den Computer. Sie ergibt völlig offene Stellungen mit vielen taktischen Ideen und fürchterlichen Angriffsmotiven - alles genau das Falsche gegen ein Silikonmonster. 7...Ld6 ist normal. 8.Nxe6 Qe7? After this Black is just lost. The score in over-the-board play tells a grim story: 13/14 for White. According to current theory, Black's last attempt to survive in this line is 8...fxe6 9 Bg6+ Ke7 10 0-0 Qc7 11 Re1 Kd8. At the cost of losing a tempo with his king, Black avoids having his queen stuck at e7, where she blocks in the whole of Black's kingside. With the queen on c7, the bishop on f8 can move and Black has somewhat more freedom. Having said that, White's attack is still very dangerous, but it is by no means a forced win. Danach ist Schwarz schlicht verloren. Die Statistik zeigt eine niederschmetternde Bilanz: in 13 von 14 Partien hat Weiß gewonnen. Nach der heutigen Theorie besteht die letzte vernünftige Chance für Schwarz in der Variante 8...fxe6 9.Bg6+ Ke7 10.0-0 Qc7 11.Re1 Kd8 Schwarz verliert ein Tempo mit seinem König, dafür ist die Dame nicht auf e7 gebunden, wo sie den ganzen schwarzen Königsflügel blockiert. Mit der Dame auf c7 kann der Läufer auf f8 ziehen, und Schwarz hat etwas mehr Freiheit. Der weiße Angriff ist immer noch brandgefährlich, aber es gibt keinen erzwungenen Gewinn. 12.c4 12.Rxe6 Bd6 13.Re1 Nf8 14.Bd3 Bg4 12...Bb4 13.Re2 Nf8 14.Ne5 14.Bc2 Bd6 15.g3 Qe7! 14...Nxg6 15.Nxg6 Re8 16.c5 Qf7! Granda Zuniga Der chilenische GM hältdie schwarzue Stellung für besser. 17.Ne5 Qh5 18.f3 18.Nc4 b5 19.Ne5 Bd7 20.a4 bxa4 21.Rxa4 a5 22.f3 Re7 18...Ba5 19.g4 Qh3 20.Rg2 Bc7 21.Rg3 Qh4 22.Ng6 Bxg3! 23.Nxh4 Bxh4 Wolff,P-Granda Zuniga,J/New York Reshevsky 1992/CBM 31/[Granda Zuniga] 9.0-0 fxe6 10.Bg6+ Kd8 11.Bf4 b5 A new move, but not one which will resurrect this variation. A few examples should demonstrate the true horror of Black's situation: Ein neuer Zug, aber nicht einer, der diese Variante wiederbeleben dürfte. Die Idee ist, das Feld d5 für den Springer zu bekommen, der sonst mit c2-c4 vertrieben werden konnte. Aber der Zug gibt Weiß Gelegenheit, weitere Linien am Damenflügel zu öffnen und seinen a1-Turm à tempo ins Spiel zu bringen. Ferner bleibt das Hauptproblem von Schwarz weiter bestehen: er kann die Dame nicht bewegen. Das einzige Feld für sie ist b4, aber das läßt nicht nur den e6-Bauern ohne Verteidigung, Weiß kann die Dame jagen und dadurch sogar Zeit gewinnen. 11...Ne8 12.Bg3 Nd6 13.Re1 Nf6 14.Bxd6 Qxd6 15.Ne5 Qd5 16.Nf7+ Kc7 17.Nxh8 Qg5 18.Qd3 Bd6 19.Nf7 Bxh2+ 20.Kxh2 Ng4+ 21.Kg1 Qf6 22.Qg3+ e5 23.Nxe5 1-0 Schott,R-Kirner,M/Eppingen HT2 1988 11...Qb4 12.a3 Qb6 12...Qxb2 13.Qe2 Nd5 14.Bd2 Bd6 15.Qxe6 Kc7 16.Rfb1 Qxa1 17.Rxa1 Ne5 18.Qxd6+ Kxd6 19.Nxe5 Kc7 20.c4 Ne7 21.Bf4 Rf8 22.Nf7+ Kd7 23.Bh5 b5 24.c5 Nf5 25.Ne5+ Ke6 26.Nxc6 Bb7 27.Re1+ Kf6 28.d5 g6 29.Re6+ Kg7 30.Be5+ Kg8 31.Rxg6+ Kh7 32.g4 Bxc6 33.gxf5 Rxf5 34.Rg7+ Kh8 35.Rg5+ Rxe5 36.Rxe5 Bd7 1-0 Geller,E-Meduna,E/Sochi 1986 13.Qe2 Be7 14.c4 Rf8 15.Bg3 a5 16.Rfe1 c5 17.d5 e5 18.Nxe5 Nxe5 19.Qxe5 Ng8 20.Qxg7 Qf6 21.Qh7 Ra6 22.Re3 Bf5 23.Bxf5 Qxf5 24.Qxf5 Rxf5 25.Rae1 Kd7 26.f3 Bf6 27.Rd3 Bxb2 28.Rb1 Rb6 29.Kf1 Rff6 30.d6 h5 31.Be5 Re6 32.Rxb2 Rxb2 33.Bxb2 Rxd6 34.Rxd6+ Kxd6 35.Ke2 Ne7 36.g4 Bengtsson,O-Henriksson,J/SVE-ch op Vaxjo 1992/ 1-0 (46) 11...Nd5 12.Bg3 Qb4 13.Re1 13.Qe2 Be7 14.c4 N5b6 15.b3 Bf6 16.Rad1 Qe7 17.Rfe1 Nf8 18.Be4 Bd7 19.Qd3 Qf7 20.a4 a5 21.Qe3 Ra6 22.Qf4 Bc8 23.d5 cxd5 24.cxd5 Ke8 25.Bd3 Ra8 26.Bb5+ Bd7 27.dxe6 Nxe6 28.Qd6 Bxb5 29.Rxe6+ Be7 30.axb5 1-0 Dvoirys,S-Zakharevich,I/Kursk 1987 13...Be7 14.Qe2 14.a3 Qxb2 15.c4 Nc3 16.Qd3 Na4 17.Qe3 Nf8 18.Ne5 Nxg6 19.Nxg6 Rf8 20.Nxf8 Bxf8 21.Qf4 Ke8 22.Qf5 Nc3 23.Rxe6+ Bxe6 24.Qxe6+ Be7 25.Re1 1-0 Schlosser,M-Kholmov,R/Sochi-A 1989 14...Bf6 15.c4 Ne7 16.a3 Qb3 17.Bd3 Nf5 18.Bxf5 exf5 19.Qe6 Qb6 20.c5 Nxc5 21.Qd6+ Nd7 22.Ne5 Bxe5 23.Rxe5 Re8 24.Rxe8+ Kxe8 25.Re1+ Ne5 26.Rxe5+ Kf7 27.Re7+ 1-0 Chandler, M-Huebner,R/Biel 1987 The idea of Kasparov's move is to secure the d5-square for his knight against the thrust c2-c4. However, it gives White the chance to open new lines on the queenside and bring his a1-rook into play without loss of time. Moreover, it fails to deal with the main problem of Black's position - his inability to move his queen. The only square available to her is b4, but this not only leaves the e6-pawn undefended, it also allows White to gain time by chasing the queen. 12.a4 Bb7 After Nach 12...bxa4 13.Rxa4 Nd5 14.Bg3 Black still cannot move the queen, while c4 is imminent. kann Schwarz immer noch nicht die Dame bewegen, während gleichzeitig c4 droht. 13.Re1 Nd5 Attempting to keep the position closed by Der Versuch, die Stellung mit 13...b4 doesn't work because of geschlossen zu halten, funktioniert nicht: 14.c4 bxc3 15.bxc3 Nd5 16.Bg3 Nxc3 or else c4 (sonst kommt c4) 17.Qb3 attacking c3 and b7 (greift c3 und b7 an) Qb4 18.Qxe6 Be7 19.Bf5 Nb6 20.a5 with a decisive attack. mit spielentscheidendem Angriff. 14.Bg3 Kc8 Another move which does little to unblock the traffic jam of the kingside. Ein weiterer Zug, der wenig zur Auflösung des Verkehrsstaus am Königsflügel beiträgt. However Allerdings ist 14...Qb4 is no better nicht besser: 15.Rxe6 Be7 16.c3 Qxb2 17.c4 N5f6 17...bxc4 18.Rb1 Nc3 19.Rxb2 Nxd1 20.Rxb7 is easily winning gewinnt leicht 18.Ne5 Nxe5 19.dxe5+ Nd7 20.Bf5 and wins. und Weiß gewinnt. 15.axb5 The a1-rook enters the game. Der a1-Turm ist jetzt mit von der Partie. cxb5 16.Qd3 Bc6 Black must defend the weak pawn on b5, but 16...Nc7 loses to 17 Qc3 Nf6 18 Rxe6 Qd8 19 Bf5 Kb8 20 Ne5 Nfd5 21 Nc6+ Bxc6 22 Qxc6. Since 16...a6 is met by 17 Bf5, as in the game, there is nothing better than the text-move. Schwarz muß den schwachen Bauern auf b5 verteidigen, aber 16...Nc7 loses to verliert wegen 17.Qc3 Nf6 18.Rxe6 Qd8 19.Bf5 Kb8 20.Ne5 Nfd5 21.Nc6+ Bxc6 22.Qxc6 Since Da auf 16...a6 is met by genauso wie in der Partie 17.Bf5 as in the game, there is nothing better than the text-move. folgt, gibt es letztendlich nichts besseres als den Textzug. 17.Bf5 exf5 Other moves also lose, for example Andere Züge verlieren ebenfalls, z.B. 17...Nb4 18.Qc3 Kb7 19.Rxe6 Qd8 20.d5 Bxd5 21.Re8 or oder 17...Nc7 18.Bxc7 Kxc7 19.Rxe6 Qd8 20.Qc3 Bd6 21.Ne5 Nb8 22.Be4 18.Rxe7 Bxe7 Or 18...Nxe7 19 Qc3 Nb8 (19...Kb7 20 Qa5 mates) 20 Ne5 with a crushing attack. After the move played, Black has sufficient material for the queen, but his position is a complete wreck. Many of his pieces are still on their original squares, the ones that are developed are hopelessly uncoordinated and his king is horribly exposed. Oder 18...Nxe7 19.Qc3 Nb8 19...Kb7 20.Qa5 mates führt zum Matt 20.Ne5 mit einem vernichtenden Angriff. Nach dem Textzug hat Schwarz genügend Material für die Dame erhalten, aber seine Stellung ist ein Trümmerhaufen. Die Türme sind immer noch auf ihren Ausgangsfeldern, die entwickelten Figuren sind völlig unkoordiniert, und der König ist hoffnungslos exponiert. 19.c4 Die Aufgabe ist eine verständliche Entscheidung, wenn man sich die folgenden Varianten vergegenwärtigt: 19.c4 bxc4 19...Nb4 20.Qxf5 bxc4 21.Ne5 20.Qxc4 Nb4 21.Re1 Re8 22.Nh4 Nb6 23.Qf7 N6d5 24.Nxf5 Kd8 25.Nxg7 Ein Desaster für Kasparov. 1–0
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WhiteEloWBlackEloBResYearECOEventRnd
Comp Deep Blue-Kasparov,G27851–01997B17New York Man-Machine6
Kasparov,G2785Comp Deep Blue-½–½1997A07New York Man-Machine5
Comp Deep Blue-Kasparov,G2785½–½1997B07New York Man-Machine4
Kasparov,G2785Comp Deep Blue-½–½1997A29New York Man-Machine3
Comp Deep Blue-Kasparov,G27851–01997C93New York Man-Machine2
Kasparov,G2785Comp Deep Blue-1–01997A07New York Man-Machine1

In press conferences and interviews Kasparov had always declared that he was defending the "honour of mankind" against the world's best chess computer. After Kasparov lost the match, some professionals were not well disposed towards Kasparov. Viktor Kortschnoi commented bitingly: "Nobody asked Kasparov to play for the honour of mankind, and above all nobody asked him to lose it then."

As early as 2012, the Uganda Post Office dedicated a set of special stamps to the battle "Man vs Machine".

 

The post of Niger also issued a stamp about computer chess.

Translation from German: Johannes Fischer

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André Schulz started working for ChessBase in 1991 and is an editor of ChessBase News.

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