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Lev Polugaevsky vs David Bronstein
USSR Championship (1965), Tallinn URS, rd 19, Dec-23
English Opening: Anglo-Indian Defense. Hedgehog System (A17)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Feb-17-14
Premium Chessgames Member
  Honza Cervenka: I don't see why black declined the trade of Queens in move 37, as the Pawn ending looks like a draw, for example 37...Qxa4 38.bxa4 Kf7 39.g4 Kg7 40.Ke4 Kf7 41.f4 Kg6 42.Kd3 f5! 43.g5 a5! 44.e4 Kf7 45.exf5 exf5 46.Ke3 Ke6 47.Kf3 Kf7 48.Kg3 Kg7 49.Kh4 Kg6 etc. because white King is unable to penetrate into black's camp. 41...Qc2 was a mistake, instead of that 41...Qf5 would have held the equality. But white could have played far better 39.Qb8! instead of 39.Qxb6 with clear advantage, for example 39...Qxb3 40.Qg8+ Kh6 (of course, after 40...Kf5?? black gets mate in 2) 41.Qxe6 etc.
Feb-18-14  SChesshevsky: <Honza Cervenka: I don't see why black declined the trade of Queens in move 37, as the Pawn ending looks like a draw,>

It may draw but after 38. bxa4 it's that two pawns holding up three nut on the Qside basically giving White a pawn up and with decent play it looks like he's probably going to eventually get that extra pawn free on the Kside allowing the King access to the frozen Black Qside.

I didn't calculate it out but it appears maybe the key squares for White's King are f4 and e5. My plan might play be to play Kf4 and then pawn g4 and when Black...Kg6 then White Ke4 and f4 supporting the exchange on g5 opening the e5 square for the White King which forces Black to defend e6 which allows White Kd6 which probably should win.

I'm not absolutely sure it works but it looks like a possibility.

Feb-18-14
Premium Chessgames Member
  Honza Cervenka: Well, I have to admit that things are not so good for black in that Pawn ending, if white chooses more subtle approach than I have used in my first quick attempt: 37...Qxa4 38.bxa4 Kf7 39.g4 Kg7 40.Kf4 (now g4-g5 is a threat) 40...Kg6 (this stops g4-g5 for the moment as 41.g5 can be met successfully with 41...e5+) 41.f3 (now black must move with a-Pawn, as the King must stay on g6 due to g4-g5 breach) 41...a6 (41...a5 is not better, for example 42.Kg3 Kg7 43.f4 Kf7 44.f5! or 43...Kg6 44.Kh4 etc. with easy win for white) 42.Kg3 Kf7 43.f4 Kg7 44.Kf3 Kf7 45.Ke4 Kg6 and now comes the point 46.a5! bxa5 47.Kd3 and black has nothing against invasion of white King via a-file. So Bronstein was right to decline the trade of Queens despite of the fact that Queen ending was with optimal play clearly better and probably won for white as well.

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