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Normal Topic Carlsen – So (2021) (Read 755 times)
Poghosyan V
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Re: Carlsen – So (2021)
Reply #2 - 06/17/24 at 14:03:28
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1...Ra1+
  
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Poghosyan V
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Re: Carlsen – So (2021)
Reply #1 - 06/17/24 at 14:02:46
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Part 2


Back to D. 3 

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Instead of 1...Kf7? (played by Carlsen) Black can draw by 1...Ra1+ or 1...Kh7.

1...Ra1+

1...Kh7 transposes after 2.a5 Ra1+! 3.Kf2 Ra2+! 4.Kg3 Ra3! in the main line. 2...Kh6? instead of 2…Ra1+! loses to 3.Ra8! g5 4.hxg5+! Kxg5 5.a6 Kf4 6.a7 Ke3 9.Rf8 Rxa7 10.Rxf6 or 4․․․ fxg5 5.a6 .Kg7 6.a7! Ra1+ 7.Kf2! Ra2+ 8.Ke3+–. 
After 1...Kh7 2.a5 Ra1+! 3.Kh2 Black has the only saving move - 3...Kh6!
When the white king is on h2, it becomes possible for Black to implement the plan Kh6 followed by g5. Unlike the previous line, White has no chance to free his king and send him to the center in order to attack the weak e5 pawn.
4.Ra8 g5! 5.hxg5+ fxg5! 6.a6 Kg7 
Now White has two possibilities – either to keep his pawn on a6 and trying to bring his king to the queenside where it has a refuge against vertical checks or to advance the pawn to a7. For the implementation of both plans White must play g3 in order to free his king which however allows Black to create a passed pawn. 7.g3 Kh7 8.Kg2 Kg7 9.Kf2 Ra2+ 10.Ke3 Ra3+ 11.Ke2 Ra2+ 12.Kd3 h4 13.gxh4 gxh4= or  7.a7 Kh7! 8.g3 Ra2+ 9.Kg1 Ra1+ 10.Kf2 Ra2+ 11.Ke3 Ra3+ 12.Ke2 Ra2+=.

2.Kf2 Ra2+ 3.Kg3 Kh7 4.a5 

D. 3-1

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4…Ra3!

Placing the rook on the 3rd rank, Black moves on to the implementation of the g5-g4 plan. 4...Ra3! is the first of a long succession of 'only' moves.

5.Ra7 Kh6! 6.a6 g5! 7.Ra8

D. 3-2

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7...Kg7! 

The only move – Black cannot leave the square g7 unattended. After 7...Kh7? 8.a7 g4 White wins by swapping his outside passed pawn for the f6 pawn: 9.Rf8! Rxa7 10.Rxf6 gxf3 11.gxf3 Ra5 12.Rf5 Kg6 13.Kf2+–.

8.a7

D. 3-3

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8…g4! 9.Kf2 gxf3 10.gxf3 Ra2+ 11.Ke3 Ra3+ 12.Kd2 Ra2+ 13.Kc3 Ra3+ 14.Kb4 Ra1 15.Kc5 Rc1+ 16.Kd6 Rd1+! 17.Ke6 Ra1! 18.Kf5 Ra2 19.Rd8 Rxa7! 20.Rd3 Rb7 21.Ra3 Rc7 22.Ra6 Rc3! 23.Ra7+ Kh6 24.Kxf6 Rxf3+ 25.Kxe5 Rh3=.






  
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Carlsen – So (2021)
06/17/24 at 11:10:18
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Carlsen – So
(2021)
(Goldmoney Asian Rapid KO chess24.com INT (2), 30.06.2021)
Part 1

D. 1

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This position with reversed colours arose in the rapid game between Carlsen and So Goldmoney Asian Rapid KO chess24.com INT (2), 30.06.2021 after 32.Rxb3 Rxd6. Carlsen was the side who was pawn down. 

The game went as follows:

1...Rb2 2.h4 h5 3.Rd6 e5 4.a4 Ra2 5.Ra6 Kf7? 6.a5? Ra1+? 7.Kf2? Ra2+ 8.Kg3 Kg6? 9.Ra7 Kh6 10.Ra8 g6 11.Ra7? f5 12.a6 fxe4 13.fxe4 g5! 14.Ra8 g4! 15.a7 Kg7 16.Kh2 Kh7! 17.Kg3 Kg7! 18.Re8 Ra3+! 19.Kf2 Rxa7 20.Rxe5 Kh6 21.Rd5 Ra2+ 22.Kg3 Re2 23.Re5 Kg6? 24.Rg5+ Kh6 25.e5 Ra2 26.Rf5 Re2 27.Rg5 Ra2 28.Kg3 Rxg2 29.e6 Rf2+ 30.Ke5 Re2+ 31.Kd6 Rd2+ 32.Kc7 Re2 33.Kd7 Rd2+ 34.Ke8 Rh2 35.Kf7 Rf2+ 36.Ke8 Rh2 37.e7 Rxh4 38.Re5 g3 39.Kd7 Rd4+ 40.Ke6. Carlsen resigned.

I use the symbols ! and ? in accordance with the so-called Nunn convention. The question mark '?' means that the move changes the result of the position. “The exclamation mark ! after a move means that this move is the only one not to change the result of the position... The use of the word 'only' needs to be clarified. I consider a (white) winning move to be unique if any other move preserving the win allows a defence by which Black can force White to return to the current position in order to win. In other words suppose that White has a winning move, but he can also repeat the position before embarking on the winning continuation. In this case the winning move is still marked unique, even though the repetition also retains the win” (John Nunn, Secrets of Rook Endings, Gambit, 1999, P. 4). For the last case mentioned by Nunn I have assigned in my analysis a special meaning to the symbol '?!': it refers to a move which does not change the result, but can lead to a repetition of the position or make the legitimate result more complicated.   

After transition into the rook endgame in D. 1 Carlsen had several opportunities to change the pawn structure and make a relatively easy draw (1...f5, 1...g5, 2...f5 etc.). Instead, he chose a more standard but less favourable pawn structure (33.Rb7 h5 34.h4 Rd3 35.e4 a5), which introduced unnecessary difficulties.

1…Rb2 2.h4 h5 3.Rd6 e5


D. 2 after 3...e5

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After 3...e5 the pawn structure is completely symmetrical. Black must create an active counterplay on the kingside, otherwise marking time will allow White to push the pawn to the seventh rank and win.

4.a4 Ra2 5.Ra6

D. 3 after 5.Ra6

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This is the critical position with the pawn on a4: the result of the game depends on who is to move. We will see later (see the thread „Critical position with the pawn on a4”) that White to move wins. With Black to move the position is drawn but he should be extremely careful.   
Black's counterplay is connected with the changing of the pawn structure. This can only be achieved through the g-pawn. Accordingly, Black has 2 counterplay plans - g7-g5 or g7-g6 in order to move f6-f5.

5.․․Kf7?

This move of Carlsen is a result-changing mistake: either 5...Kh7 or 5...Ra1+ was needed (see the prove after the analysis of the game). From this move onwards, both players make several result-changing mistakes (5.․․Kf7? 6.a5? Ra1+? 7.Kf2? Ra2+ 8.Kg3 Kg6?).   

D. 4 after 5.․․Kf7?

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6.a5?

The only winning move is 6.Ra7+!, because it forces the Black`s king to go to g6 and to block the advance of the g7 pawn. After 6...Kg6 7.a5! Kh6 8.a6 White wins, as analysed in the thread „Critical position with the pawn on a4”.

6...Ra1+? 

This move helps White to move the king to h2 and thwart the g5-g4 advance. However, So does not take advantage of this opportunity. 
Carlsen misses the opportunity to draw with 6...g5! 

D. 5 Variation after 6.a5? g5!   

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7.hxg5 fxg5! 8.Rh6 Rxa5 9.Rxh5 Kg6 10.Rh8 Kg7 (White tries to prevent the g4 advance, but it fails because of the king's position on g1. White is a single tempo short - see the line 6...Ra1+? 7.Kh2!) 11.Rh3 Kg6 12.Kh2 Ra2! 13.Kg3 g4! 14.Rh8 gxf3 15.gxf3 Kg7=.   

7.Kf2?

7.Kh2! was needed, after which 7...g5 is no longer useful. 
 
D. 6 Variation after 6...Ra1+? 7.Kh2!

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Now, when the king is on h2, 7...g5 does not help anymore. Black king`s position on f7 allows White to capture the h5 pawn and at the same time to neutralize the g5-g4 advance. 
7...g5 8.hxg5! fxg5 9.Rh6! Rxa5 10.Rxh5! Kg6 11.Rh8! Kg7 12.Rh3! Kg6 13.Kg3! Ra2 (With Black to move we had this position in the line 6...g5. Here White is able to prevent g5-g4 and to activate his rook) 14.Rh8 Kf7 15.Rh1 Kg6 16.Rf1 Rb2 17.Rf2 Rb8 18.Ra2 Kh5 19.Ra5 Re8 20.Rd5 Re7 21.Rd8 Re6 22.Rh8+ Kg6 23.Kg4 Re7 24.Rg8++–.

7․․․Ra2+

This move doesn't spoil anything, but with the White king on f2 immediately 7...g5 was more consistent. 

D. 7 after 7.Kf2 g5

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8.hxg5 (8.Kg3 Ra2 9.Ra8 Kg7 10.a6 Ra3!= see D. 3-2) 8...fxg5 9.Rh6 (Unlike the line 6...Ra1+? 7.Kh2! g5 8.hxg5! fxg5 9.Rh6!, here 9.Rh6 does not help, because the white king is not in a safe position and has to go to g3 after 9...Ra2+) 9...Ra2+ 10.Kg3  h4+! 11.Kh3 Rxa5! 12.Kg4 Ra2! 13.Kxg5 Rxg2+! 14.Kf5  Rg3=.

8.Kg3 Kg6?

8...g5! was necessary: see the line 7...g5 8.Kg3 Ra2. 

9.Ra7 Kh6 10.Ra8 g6 11.Ra7?


D. 8 after 11.Ra7?

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11.Ra7? loses a vital tempo and gives Black the time he needs to implement the plan with 11...f5 or 11...g5. 11. a6 or 11.Kh2 was necessary.   

11...f5 

Or 11...g5 12.hxg5+ fxg5! 13.a6 Kg6 14.Ra8 Kg7 15.Kh2 Ra1=.   

12.a6 fxe4 13.fxe4 g5! 14.Ra8 g4! 15.a7 Kg7 16.Kh2 Kh7! 17.Kg3 Kg7! 18.Re8 Ra3+! 19.Kf2 Rxa7 20.Rxe5 Kh6 21.Rd5 Ra2+ 22.Kg3 Re2 23.Re5

D. 9

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23...Kg6? 

This is the decisive error. K. Müller analysed this endgame in Chessbae.com after 23.Re5 and showed that Carlsen could have reached a draw.

24.Rg5+ Kh6 25.e5 Ra2 26.Rf5 Re2 27.Rg5 Ra2 28.Kg3 Rxg2 29.e6 Rf2+ 30.Ke5 Re2+ 31.Kd6 Rd2+ 32.Kc7 Re2 33.Kd7 Rd2+ 34.Ke8 Rh2 35.Kf7 Rf2+ 36.Ke8 Rh2 37.e7 Rxh4 38.Re5 g3 39.Kd7 Rd4+ 40.Ke6. Carlsen resignEdited:
ed. 

(to be continued)
  
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