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Arkadij Naiditsch vs Baskaran Adhiban
World Team Chess Championship (2019), Astana KAZ, rd 7, Mar-12
Spanish Game: Exchange. Normal Variation (C69)  ·  1/2-1/2


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Kibitzer's Corner
May-16-19  Straclonoor: Stockfish gives serious advantage for white in pawn ending.

Analysis by Stockfish 090519 64 POPCNT:

+- (3.54): 33.Kf4 Ke6 34.Kg5 a5 35.Kh6 Kf5 36.Kxh7 g5 37.h3 b5 38.Kg7 c5 39.c3 c4 40.a3 Ke4 41.Kf6 Kd3 42.Kxg5 Kc2 43.h4 Kxb2 44.h5 b4 45.axb4 a4 46.b5 a3 47.b6 a2 48.b7 a1Q 49.b8Q+ Kc2 50.h6 Qa5+ 51.Kg6 Qd5 52.Qf4 Qg8+ 53.Kh5 Kb3 54.Qf5 Qe8+ 55.Kg5 Qg8+ 56.Kh4 Qd8+ 57.Kg4 Qd1+ 58.Kg5 Qd8+ 59.Qf6 Qg8+ 60.Kf4 Qg1 61.Ke5 Qh2+ 62.Kd5 Qg2+ 63.Ke6 Qe4+ 64.Kd6 Qb7 65.Ke5 Qb8+ 66.Kf5 Qb7 67.Kf4 Qc7+ 68.Kg4 Qd7+ 69.Kg3 Qd1 70.f4 Qg1+ 71.Kh3 Qh1+ 72.Kg4

Premium Chessgames Member
  beatgiant: <Straclonoor>
Yes, but in the actual game Black varied with <34...Kf7> instead of 34...a5, and that seems hard to crack.

I don't really get a lot out of seeing a 40-move long computer line with no explanation.

May-16-19  dumbgai: And +3.54 engine evaluation doesnít necessarily mean that much in a pure pawn endgame.
May-16-19  Captain Hindsight: < 36. a4!! > would have been the winning move.

click for larger view

Black will run out of moves on the queenside. With a reserve tempo left White wins the opposition and that's the end of it.

May-16-19  dumbgai: Canít black just play Kh8 once he runs out of queenside moves?
Premium Chessgames Member
  beatgiant: <dumbgai>
We might reach a position something like this:

click for larger view

And now White has <1. f5> gxf5 2. Kg5 Kg7 3. Kxf5 Kf7 4. Ke5 Ke7 5. h4. White's advanced king position looks good enough for an easy win.

Premium Chessgames Member
  beatgiant: <Captain Hindsight>,<dumbgai>

But, it's another question whether Black must actually run out of moves on the queenside. What happens if he leaves the queenside untouched and shuttles his king between g8 and h8, as happened in the actual game?

Also, if White is able to achieve the plan of fixing the queenside before the f5 break, it's not clear that <36. a4> is the only way to do it and deserves the "!!" notation.

For example, instead of the game's 38. c5, at that point <38. a4> is possible. Why wouldn't that work just as well?

<Captain Hindsight> Have you got the answers? If not, I'll have to take a closer look at this ending.

May-20-19  Straclonoor: < in the actual game Black varied with 34...Kf7 instead of 34...a5, and that seems hard to crack.>

Yes, very hard! Stockfisch done it after long analysis.

Analysis by Stockfish 150519 64 POPCNT:

+- (7.03): 35.Kh6 Kg8 36.a4 a5 37.b3 Kh8 38.c3 Kg8 39.b4 b6 40.bxa5 bxa5 41.f4 Kh8 42.f5 gxf5 43.Kg5 Kg7 44.Kxf5 Kf7 45.Ke5 Ke7 46.c4 Kf7 47.h3 Ke7 48.h4 h5 49.Kf5 Kf7 50.c5 Ke7 51.Kg6 Ke6 52.Kxh5 Kf6 53.c6 Kf5 54.Kh6 Kf6 55.h5 Kf7 56.Kg5 Kg7 57.Kf5 Kf7 58.h6 Kg8 59.Kf6 Kh7 60.Ke6

Premium Chessgames Member
  beatgiant: I'll try to answer my own questions.

<What happens if he leaves the queenside untouched and shuttles his king between g8 and h8, as happened in the actual game?>

White can push the pawns and eventually reach a position like this:

click for larger view

Now White has 1. <c5> threatening 2. c6, when one of the pawns will break through. Black will be forced to reply 1...c6 and then White can fix the queenside pawns with 2. b6. Then White can carry out the plan described previously with the eventual f4-f5 etc. and win.

Premium Chessgames Member
  beatgiant: My other question <Is 36. a4 the only winning move> looks pretty tricky. It seems several possible queenside pawn structures also leave White winning, so I really doubt 36. a4 is the only move. For example, I think 36. b4 is also a win. I'm not completely sure about a White win after the game's 36. c4.

<Captain Hindsight> Any comment? For example, after 36. b4 do you think Black can save it?

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