David Bronstein vs Tigran Petrosian (1978)

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David Bronstein vs Tigran Petrosian
USSR Team Cup (1978), Ordzhonikidze URS, May-??
French Defense: Winawer Variation (C15) · 1-0

ANALYSIS [x]

FEN COPIED

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Mar-16-04		rosoft2001: Any hint why Petrosian resigned?

Mar-17-04		aulero: I don't see a forced win, but I suspect that after 41...Kh[78] 42.Rg5 the Black's position collapses. I think (but I don't really know) that the game was supended and home analysis showed that Black's position could not be saved.

Mar-17-04		Honza Cervenka: 41...Kh8 42.Rg5 gives nothing to white after 42...Nf6.

Mar-17-04		tamar: After 41...Kh8 42 a5 with the threat of b6 running the a pawn. Black has to be careful because of the mating threats that open up after the pawn reaches a7. Looks like White can break through.

Mar-17-04		rosoft2001: I still not see anything... The comment after move 37 from Bronstein is something like "black seems safe, but after only 4 moves he need to resign"...

Mar-17-04		tamar: <rosoft2001> Well the moves for black aren't forced after 42 a5, so the win is different against each. Obviously the choice is limited. He has to keep watch on h6 and to a certain extent f5. So I would guess he would move either the rook or the bishop. Let's try 41...♔h8 42 a5 ♗d4 43 b6 ab 44 a6 b5 45 cb ♘b6 46 a7 ♘xd5 47 ♕xf5 ♖e8 48 a8♕ ♖xa8 49 ♕xd5 This line gives an indication of the possibilities. On a rook move 42...♖d6 for example, I would think 43 ♖g6 would be very strong, exchanging it and playing b6 after. Can anyone suggest a defense for Black?

Mar-18-04		rosoft2001: if it was any chance I guess Petrosian would play. He have too 2 passed pawns... But I still dont see it...

Mar-18-04		tamar: Bronstein's comment without explanation is rather maddening, I agree. There is a funny ♕♕♕♕ variation that Fritz 7 found that shows the black pawns are not dangerous as long as White also queens. 41...♔h8 42 a5 ♖d6 43 ♖g6 ♖xg6 44 ♕xg6 ♗f2 45 b6 ab 46 a6 e3 47 ♖a1! e2 48 a7 e1♕ a8♕ and black has no good moves.

Mar-18-04		VinnyRoo2002: I disagree Honza, after 42...Nf6 43.Rxf5 looks very strong. If 43...Nxh5 44.Rxf8 Kg7 45. Rf5

Apr-29-06		Brown: <VinnyRoo2002> 42...Nf6 43.Rxf5 Nxh5 44.Rxf8 Bxf8 and black is winning.

Dec-15-06		Brown: It seems the above ideas can be combined. 41...Kh8 42.a5 Rd6 43.Rg3 (keeping an eye on the central pawns) and black will not be able to generate counterplay, nor be able to stop the b6, axb6, a6 WBW sequence.

Nov-14-09		DrGridlock: Black has 4 responses at move 41. Two lead directly to mate. His other options are Kh7 and Kh8. Rybka scores it: Analysis by Rybka 2.2n2 mp 32-bit (26 move depth): 1. (2.10): 41...Kh8 42.a5 Rd6 43.Rg6 Rxg6 44.Qxg6 Qg7 45.Qxf5 Bf2 46.Qg4 e3 47.Qxg7+ 2. (3.08): 41...Kh7 42.Nc7 Rb6 43.a5 Rf6 44.Ne8 Rf7 45.Rg6 Bd4 46.Rxh6+ Qxh6 47.Qxf7+ Kh8 48.Qxf5 3. (#13): 41...Qg7 42.Rxg7+ 4. (#10): 41...Rg6 42.Qxg6+ which matches pretty well the lines given above. An issue is White's option at move 43. Rybka analysis suggests that Rg6 is significantly preferred to Rg3, perhaps in the range that keeps the game playable for Black. Rdd2 is an option which Rybka evaluates as White's best option at move 43. click for larger view Analysis by Rybka 2.2n2 mp 32-bit : 1. (2.66): 43.Rdd2 Re6 44.Kh1 Bd4 45.b6 Kh7 46.b7 Nb8 47.Kh2 a6 48.h4 Nd7 49.Kh3 Nb8 2. (2.41): 43.Rg6 Rxg6 44.Qxg6 Qg7 45.Qxf5 Bf2 46.Kh1 e3 47.Qxd3 Nc5 48.Qf5 e2 49.Rb1 e1Q+ 3. (2.17): 43.h4 Bd4 44.Kh3 Kh7 45.Rg5 e3 46.Rdg1 e2 47.Rxf5 Nf6 48.Qg6+ Kh8 49.Rxf6 Bxf6 4. (1.97): 43.Ra2 Kg7 44.b6 Rg6 45.b7 Qf7 46.Rb1 Nb8 47.Qh4 Qf8 48.Rd2 a6 49.Rdb2 Kh7 5. (1.88): 43.Kh1 Bd4 44.Rg5 Nf6 45.Rxf5 Nxh5 46.Rxf8+ 6. (1.87): 43.Re1 e3 44.Rxe3 Bxe3 45.Nxe3 Nc5 46.Nxf5 Re6 47.Ng3 Rf6 48.Qe5 Qd6 49.Nh5 Qxe5 7. (1.76): 43.Nc7 e3 44.Ne8 e2 45.Nxd6 Qxd6 46.Qe8+ Qf8 47.Rxe2 dxe2 48.Qxe2 Nf6 49.Qe5 8. (1.63): 43.Rg3 Bf2 44.Rg5 Nf6 45.Rxf5 e3 46.Nxf6 Rxf6 47.Re5 Qg7 48.Qf3 e2 49.Rb1 Bd4

Nov-14-09		Paraconti: <rosoft2001> <Any hint why Petrosian resigned?> Petrosian resigned because he was playing Bronstein!

Mar-29-11		talisman: Well ♖g3 and ♙a5 are coming for white...♙a5 really improves white's position...BUT, to answer the question as to why black resigned, i would say that Tigran had plenty of time, after reaching time control, to "see" the future.

Mar-15-12		Garech: Nearly one of Petrosian's beautiful exchange sac games - but not quite! -Garech

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