Laszlo Szabo vs Valeri Korensky (1973)

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Laszlo Szabo vs Valeri Korensky
Chigorin Memorial (1973), Sochi URS, rd 10, Sep-??
Queen's Gambit Declined: Orthodox Defense. Rubinstein Variation Flohr Line (D62) · 1-0

White to move.

ANALYSIS [x]

1-0

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1

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Mar-28-19		manselton: Position after 25.Rc5 This game is in Shereshevsky's <Endgame Strategy> click for larger view From here the experienced Szabo outplays the Russian Champion of 1973. Black's next move is his first error in the ending, unnecessarily weakening his Q-side. Black's isolated QP is balanced by White's doubled b-Pawns. The game ought to be drawn with best play.

Mar-28-19		manselton: 28...g6?! Black's second error. Putting more pawns on light squares. click for larger view Much more principled is 28...g5 or 28...h6 are both much more principled. Black has little to fear from 29.Nf5+ Bxf5, getting rid of his worse piece, or 29.Bf5 Be6 30.g4 Nd7 31.Bd3 a5 click for larger view

Mar-28-19		manselton: 30.f4 <White begins active play on the K-side> to create and fix weakness there. click for larger view

Mar-28-19		manselton: 34...Bb7?! is another inaccuracy click for larger view Black should be making more effort to put his pawns or dark squares 34...f6 controlling e5 or 34...g5 disrupting the co-ordination of the white Pawns are again are better moves.

Mar-28-19		manselton: 35.h4! makes it too late to play 35...f6 click for larger view As now 36.h5 gxh5 37.Nf5+ is winning.

Mar-28-19		manselton: 37.hxg5 click for larger view <White has achieved a great deal. He has excellent control of the central dark squares d4, c5 and e5. He has fixed Black's K-side pawns on light squares. And the a6 Pawn remains weak. Yet it seems still not enough to win due to the doubled b-Pawns. If White had his Pawns on a4 and b4 then a4-a5 would be very strong. Black loses control of c5.>

Mar-28-19		manselton: 37...Ne6?! <Another dubious move and this time it is very commital.> click for larger view <Black's best piece comes off placing him in a same Bishop struggle with no counter-chances. White has free access to d4.> Against the usual grain, even 37...b5 looks drawing to me as I cannot see how White can make progress. Black can sit with his Knight on f8 to jump into e6 if the Nd4 moves. He can mark time by playing his Bishop from d7 to g4. I find no plan for White.

Mar-28-19		manselton: 42...Be6? It is not obvious but Szabo showed in the famous Soviet magazine Shakhmatny Bulletin that this is the losing move. click for larger view White wins the game due to 2 successive Zugzwangs. If Black does not play Be6 until White plays Be8 White has to use a tempo pawn move b2-b3 and the second Zugzwang becomes impossible. You need to follow the game continuation to see this.

Mar-28-19		manselton: 43...Ke7 is forced or else the white King invades e5 click for larger view

Mar-28-19		manselton: 44.Bc6! Kd6 45.Bb7 Zugzwang. Black loses a pawn but it is not over yet. click for larger view

Mar-28-19		manselton: If 45...a5 46.Ba8

Mar-28-19		manselton: 47.Bc8 click for larger view The plan now is to play Bb3 and e3-e4 with another Zugzwang on the other diagonal through the IQP.

Mar-28-19		manselton: 53...Ke6 click for larger view But 53...Be6 would also have lost.

Mar-28-19		manselton: 55.Bxd5 click for larger view Szabo has secured his Pawn and plays the rest of the game with confidence. He played some great endings in his career.

Mar-28-19		manselton: Black's drawing variation 42...Bf5 43.Be8 Be6 44.b3 <without this there is no 1st Zugzwang> 44...Ke7 45.Bc6 Kd6 46.Bb7 f6 47.gxf6 Bf7 click for larger view White has won a pawn but there is still no win as he cannot play Bb3. There is no second Zugzwang.

Mar-28-19		manselton: BTW, Korensky was Russian <Federation> Champion in 1973 and not USSR champ.

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