Difference between revisions of "TCEC Season 15 Superfinal Game 61 – Stockfish-Leela"

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{{TCEC Game Info|season=15|div=sf|divname=Superfinal|game=61|result=0-1|lichess-url=https://lichess.org/kLDvqfNF|eco=a45}}
 
{{TCEC Game Info|season=15|div=sf|divname=Superfinal|game=61|result=0-1|lichess-url=https://lichess.org/kLDvqfNF|eco=a45}}
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{{DEFAULTSORT:TCEC Season 15 Superfinal Game 061}}
  
 
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Latest revision as of 15:06, 13 October 2019

Game Season 15, Superfinal, Game 61
Result 0-1
ECO A45
Links TCEC archive
Lichess




Game overview

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  
    
    
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   
      
     
   
♜♞♝ ♞♜♚ 
♟♟  ♛ ♝ 
   ♟♟ ♟♟
  ♟♙ ♟  
  ♙ ♙♙♙♙
  ♘ ♗   
♙♙  ♗   
♖♘ ♕♔  ♖
Position after 16.. Qe7


1. d4 Nf6 2. Bg5 Ne4 3. Bf4 c5 4. f3 Qa5+ 5. c3 Nf6 6. d5 Qb6 7. Bc1

End of book moves.

7... d6 8. e4 e6 9. c4 g6 10. Ne2 Bg7 11. Nec3 O-O 12. Be2 Ne8 13. h4

An aggressive pawn move by white, which was also a novelty in the Lichess masters database.[1]

13... h6 14. g4 Qd8 15. Be3 f5 16. f4 Qe7 (diagram) 17. h5

This is where the engine evaluations begin to differ. Leela considered 17. h5 and particularly the following 18. Qd2 as dubious choices. Leela was expecting 17. Nd2.


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      
   
     
♜ ♝ ♞♜♚ 
♟♟ ♞ ♛  
   ♟ ♝  
  ♟♙♟ ♟♙
  ♙ ♙♟♙ 
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♙♙ ♘♗♗  
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Position after 24. O-O-O


17... g5 18. Qd2 e5 19. fxg5 f4 20. Bf2

The difference between 18. Qd2 and a similar move 18. Qc1 is that now white is forced to play 20. Bf2/Bg1, whereas earlier 18. Qc1 would have allowed white to play 20. gxh6.

20... hxg5

Both sides with protected passed pawns. Based on the evaluations, both engines got what they wanted. Stockfish evaluated the position as 0.66 and Leela as -1.23.

21. Qd3 Nd7 22. Rg1 Bf6 23. Nd2 Qf7 24. O-O-O (diagram)

Another move whereafter the disagreement grows between the engines. It should be noted that the pawns on the kingside are fixed and can act as shields against white's attack, whereas black has queenside attacking prospects.


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     
    
     
 ♜ ♛  ♜♚
       ♞
♟  ♟ ♞ ♙
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♘   ♙♟  
♝ ♟  ♗  
♙♙  ♕ ♖ 
 ♔  ♗ ♖ 
Position after 43... c3


24... Bd8 25. Nf3 Kh7 26. Rg2 a6 27. Rdg1 Rg8 28. Qc2 Kh8 29. Kb1 Rb8 30. Ka1 Nef6 31. Nd1 Ba5 32. Nh4

White offers the knight, but black does not accept: 32... gxh4 33. Bxh4 would give white connected passed pawns with a strong initiative.

32... Nf8 33. Bf3 b5 34. Nc3 Qe8 35. Nb1 Rb7 36. Nf5 Bxf5 37. gxf5

Now black has connected passed pawns on the king side and an attack on the Q-side

37... N8h7 38. h6 Bb4 39. Qe2 bxc4 40. Be1 Qd8 41. Nc3 Rb8 42. Kb1 Ba3 43. Na4 c3 (diagram)

43... c3 deflects the white bishop to a square where black can force the exchange of the bishops. The dark square bishop was an important piece to blockade black's connected passed pawns. Alternatives for white were not attractive:

  • 44. Nxc3 Rxb2+ 45. Qxb2 Bxb2 46. Kxb2 Qb6+ 47. Kc1 Rb8 48. Rc2 g4 49. Bxg4 Nxe4. The knight cannot be taken, because 50. Nxe4 Qb1+ 51. Kd2 Qb4+ which would win the piece back with a winning attack.
  • 44. b3 c4 45. Qxc4, queen deflected, allowing 45... g4. The g4-pawn cannot be taken, because 46. Bxg4 Rc8 47. Qf1 c2+.


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   
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      
      ♜♚
       ♞
   ♟ ♞ ♙
♟  ♙♟♙♟ 
♙ ♟♛♙♟  
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 ♙♕ ♗ ♖ 
♔     ♖ 
Position after 64. Be2


44. Bxc3 Qd7 45. Qd1 Bb4 46. Ka1 Qb7 47. Qc2 a5 48. Qe2 Qd7 49. Qd1 c4 50. a3 Qb5 51. Qc2 Qe8 52. Be2 Qd7 53. Bf3 Qb5 54. Bd1 Bxc3 55. Nxc3 Qc5 56. Qd2 Qd4 57. Qe1 Qb6 58. Qd2 Rb7 59. a4 Qc5 60. Qe1 Rb4 61. Qd2 Qb6 62. Qc1 Qd4 63. Qc2 Rb3 64. Be2 (diagram) Rxc3

Black gives the exchange for 3 connected passed pawns after the queen swap. The passers will easily win the game for black. The queen swap was not forced, but then black would have been to support the f-pawn and g-pawn pushes with the queen. For example: 65. bxc3 Qe3 66. Bg4 f3 67. Rf2 Nxg4 68. Rxg4 Nf6.

65. Qxc3 65... Qxc3 66. bxc3 Nxe4 67. Bf3 Nef6 68. Be2 e4 69. Bxc4 g4 70. Rb2 Ng5 71. Rb6 Nf7 72. Bf1 f3 73. c4 Nd7 74. Rb7 Nfe5 75. f6 e3 76. Rb3 e2 77. Bxe2 fxe2 78. Re3 Nf3 79. f7 Rf8 80. Rxg4 e1=Q+ 81. Rxe1 Nxe1 82. Rg6 0-1

The game was adjudicated as a win for black.

Analysis

Adagmator's analysis of the game


The Chesspuzzler's analysis of the game


Kingscrusher's analysis of the game


Game analysis by ElzChess


References