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David Bronstein vs Bent Larsen
Amsterdam Interzonal (1964), Amsterdam NED, rd 19, Jun-15
King's Indian Defense: Averbakh. Benoni Defense Advance Variation (E75)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
Jan-29-04  Whitehat1963: Strange and complex, as you'd expect from this pair.
May-18-04  Whitehat1963: Well-calculated exchange at 47...Rxf4!
May-19-04  Resignation Trap: A few months earlier, these two players met at the Amsterdam Interzonal, and they produced an extremely complicated and much-analyzed game: Bronstein vs Larsen, 1964

According to Larsen, Bronstein still had a mathematical chance to advance to the Candidates Matches after that loss, but he became disheartened, and ended the Interzonal with none of his usual flair.

Larsen attributes his victory in the present game to his earlier win at Amsterdam. "Some wins yield more than one point!"

Apr-06-10  Everett: I believe there is a draw on move 25 (or thereabouts) for white, but I forget the continuation...
Apr-10-10  Everett: Taking a closer look at this game, I don't know why Bronstein, after getting outplayed in the opening, didn't go for some semblance of activity with <20.Rxe8 Qxe8 21.Nf3.>

The white rook cannot be picked up so easily after <21..Bf3 (covering e7) 22.Qc2 Qc8 23.Rxf7! Kxf7 24.Qxg6+ Ke7 25.Qh7+ Ke8? <..Kd8 26.Ne6+ Ke8 27.Nc7+ with perpetual> 26.Qg8+! <26.Qg6+ is another perpetual>> and black has major coordination problems after both <26..Ke7 27.Ng6+> and <26..Kd7 27.Qe6+>.

BTW, I think the above kibitzing from <Whitehat1963> and <Resignation Trap> belongs on the following page: Bronstein vs Larsen, 1964

This game no doubt probably had much more kibitzing on it, and was accidentally gutted when cleaning up the database.

Apr-10-10  Everett: Finally, <25.dxe6> is not easy to meet for black at all. White threatens 26.e7 and if black plays <25..Qf8>, covering the rook, then <26.Nxf6 Qxf6 27.Rf7 Qg5 28.Qf3> and things are not so clear.

What does Kasparov say about this position in his OMGP book?

Dec-25-10  ForeverYoung: I took a look at this game today with Larsen's notes on it. It is unbelievably complex! White has some drawing chances in the line which Larsen gives: 25 dxe6 Nxc4 26 Qh4 g5 27 Nxf6+ Qxf6 28 Qxc4 Re8 29 e7+ Kg7 30 Rxa7 or 29 Qe4 Re7 but the burden is on him to hold the ending.
Dec-25-10  sevenseaman: I think Bronstein threw away a good position. At least a draw. Maybe he had an upset tummy!
Sep-17-12  ozmikey: <I think Bronstein threw away a good position. At least a draw.>

He sure did. After the much better alternative 25. de, Larsen's excellent and entertaining notes give 25...Nxc4 as best, with the continuation 26. e7 Rf1+ 27. Kh2! Qe8 28. Qe2! (not 28. Qe6+? Qf7) Rf5! (only move) 29. g4! (again, the obvious 29. Qxc4+? d5 favours Black) Qf7 30. gxf5 Re8 31. fxg6 Qe6:


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Larsen claims an advantage for Black here, but when playing through the game I felt that White must have some decisive shot in this position, so I called in the silicon monster. And sure enough, the cold-blooded 32. Qf1!! wins in all variations (32...Qe5+ 33. g3 changes nothing). A lovely move but easy to miss, given the obvious instinct to keep the e4 knight protected.

Ironically enough, in his comments to Bronstein's 26th move, Larsen mentions that after the obvious 26. Nxf6+ Qxf6 27. Qxh6 Bronstein overlooked the sneaky 27...Qd4+ 28. Kh2 Qh8!, commenting that backwards diagonal moves (such as 32. Qf1!! above) are easily missed. Indeed!

Apr-16-13  david9000: <Everett> if 25. dxe6 Qf8 26. Nxf6 Qxf6 27. Rf7 can't black play Qd4+?

In Volume IV of OMGP, Kasparov gives 25. dxe6 Qf8 26. e7 Rf1+ 27. Kh2 Qf5! 28. Qxf5 Rxf5 and says it looks like Black just remains material up, but Bronstein later discovered the tactic 29. Rxa7!!

Kasparov says this would have been "the triumph of chess fantasy!"

<White gains a draw either by the perpetual pursuit of the rook - 29...Rb8 30. Rb7! Ra8 31. Ra7- or by an entertaining perpetual check - 29...Re5 30. e8=Q+ Rexe8 31.Nf6 Kf8 32. Nh7+ Kg8 Nf6. (30. Nf6+!? Kg7 31. e8=Q+ Rxa7 32. Qb8 Rae7!
33. Qxb6 Kxf6 34. Qxd6+ Kf7 35. a4)>
OMGP Vol IV p.162 I have no idea what's going on in that last line! haha!

I played through this game today and it took a long time...Kasparov's analysis is very comprehensive

May-05-14  Everett: <david9000: <Everett> if 25. dxe6 Qf8 26. Nxf6 Qxf6 27. Rf7 can't black play Qd4+?> correct, I was a bit blind on that one.

Still think my ideas on move 20 deserve a look. Perhaps there is a reason the various annotators don't mention it, but I don't see it .

Sep-19-19  Straclonoor: On 26th move Larsen had at least two more powerful continuations.

Analysis by Stockfish 260819 64 POPCNT:

1. -+ (-11.50): 26...h5 27.Kh2 Qc8 28.Ne4 Qxb7 29.Nxf6+ Kg7 30.Qxe6 Qf7 31.Qxf7+ Kxf7 32.Nh7 Re8 33.g4 Re5 34.g5 Nxc4 35.Kg1 Rxd5 36.Kf2 Kg7 37.Nf6 Rf5+ 38.Kg1 Rxg5 39.Ne4 Rd5 40.Nc3 Rd2 41.a4 Ne3 42.Ne4 Rd4 43.Nc3 Kf7 44.g3 Rd2 45.Kh1 a6 46.Kg1 Ke7

2. -+ (-10.46): 26...Qc8 27.Rh7 h5 28.dxe6 Rxe6 29.Nxe6 Kxh7 30.Ng5+ Kg8 31.a4 Qxh3 32.gxh3 Re8 33.Nf3 Nxc4 34.Kf2 Rb8 35.Ng5 Rb4 36.a5 Ra4 37.Ne4 Rxa5 38.Kf3 Ra4 39.Kf2 Kf7 40.Nc3 Ra3 41.Nb5 Ra2+ 42.Kg1 Ra5 43.Nc7 Ra3 44.Kg2 Ra2+ 45.Kf3 Ne5+ 46.Ke4 Ra5 47.Kd5

Apr-11-20  nezhmet: Engines point out 20. Re6!! as the best move, with equal chances. For example, 20. Re6!! fxe6 21. Qc2! Re7 22. Nxe6 Qe8 23. Rxe7 Qxe7 24. Qxc3 =.
Apr-11-20  nezhmet: 20. Re6 (!!) is "best" because it asks more questions than the game move which also should have led to equality. If black survives a minefield, after 20. Re6 he can also gain equal chances but the situation is very dangerous. In the game, once Larsen found Bxf2+!, he had a draw at least.
Apr-27-20  Everett: 20.Re6!? Interesting!

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