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David Bronstein vs Viktor Korchnoi
USSR Zonal (1964), Moscow URS, rd 7, Feb-27
Queen's Gambit Accepted: Bogoljubow Defense (D24)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Jul-16-03  aulero: <chessgames.com> This is a duplicate game, see "Bronstein vs Korchnoi, 1963"
Jul-16-03
Premium Chessgames Member
  chessgames.com: Actually they are not perfect duplicates; before we can delete one of these we have to try to figure out which moves were really played.

In the game above we have 15...Qe7 and 15...Kg7, while the game you linked there is 15...Kg7 and 15...Qe7

Also note move 28...Bf5 is 28...Bg4 in the other game.

May-19-09  Brown: Bronstein steers the game into a modified KIA again in this high-level contest.

An interesting move is 14.Nh4, which seems to exchange pieces while a piece down, yet after 14..Bxg2 15.Nxg2, black still has significant issue developing his Q-side. Play could continue 15..c6 16.axb5 Ra7 17.bxc6 Nxc6 with an easier game for white.

Black's poor Q-side development ultimately is the cause of his defeat. His N doesn't come into play until move 27, when white has won back the pawn and has a crushing attack.

BTW, <chessgames>, 28..Bg4 was played according to "The Sorcerer's Apprentice." This makes the following moves make much more sense, especially both players 31st.

May-19-09  Brown: Also, after the alleged 28..Bf5, the very straight-forward 29.Rxf5 gxf5 30.Bxd7 Rxd7 31.Qf6+ Rg7 32.Nh5 Qg8 33.Ra1 is something neither Korchnoi, Bronstein, nor this patzer would miss.
Sep-01-11  computer chess guy: 23. ♖xe6! was a faster way to win. After 23. .. ♕xe6 24. ♖f6, White has an unstoppable attack, for example 24 .. ♕d7 25. ♘f5+ ♔h8 26. ♖d6 and White threatens mate in 2 starting with ♕f6+.
Oct-13-12  madhatter5: I took this position randomly from Gaprindashvili's excellent "Critical moments in Chess" (before move 23)and put it on a board and gave myself 15 minutes to calculate. I was very pleased to have played Re6!, a move stronger than Bronstein's! It must of course be said that I'm sure bronstein did see Re6, but since Ng2 crushes without a chance of calculation error, it was practically the "best" move.
Oct-28-14  Ulhumbrus: One point of 17 f5!! is that if the fork Nxf5+ is a potential threat Black has f5 covered not with two pawns but only with one pawn. For capturing a second time with the second pawn invites the fork Nxf5+ forking Black's king and queen. Thus by making use of a combination Bronstein is able to advance his attack in a way he would not have available otherwise.
Mar-06-18  zydeco: 14...c6 is funny - it's rare to lock in your own bishop like this. This game really knocked Korchnoi out of contention for the 1966 world title.
May-06-18  edubueno: 14...c6 is a big mistake. Why not Axg2 and if 15 Cxg2 - Dc6?
Nov-08-24  FM David H. Levin: <<edubueno>: 14...c6 is a big mistake. Why not Axg2 and if 15 Cxg2 - Dc6?>

John Watson's book <4 Nc3 Gambit in the Queen's Gambit Accepted and Slav> quotes the following analysis attributed to Karklins: 14...Bxg2 15. Nxg2 c6 16. f4 Qc7 17. Qf3 Ra7 18. Ne3, intending 18...Nd7 19. g4 h5 20. h3 followed by f5...

Nov-08-24
Premium Chessgames Member
  perfidious: <zydeco....This game really knocked Korchnoi out of contention for the 1966 world title.>

Considering that Korchnoi never even had a plus score in this event and was -2 before beating Bronstein in the last round, this statement makes little sense.

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