Tactics Time Chess Newsletter Happy St. Patrick's Day 2016

Published: Thu, 03/17/16

Newsletter Issue Happy St. Patrick's Day 2016 Tactics Time 
Happy St. Patrick's Day

 I always tell my chess students to look one extra move ahead at the end of a long, forced line. ~ GM Lars Bo Hansen


tactics position x
 
 
T
 
 
 
his position comes from the game GM Sergey Karjakin (2760) vs GM Hikaru Nakamura (2790), Round 2, World Championship Candidates, played in Moscow, March 12, 2016.
 
   In the position on the right it is White to move
 
   Answer below.


   Happy St. Patrick's Day!

   The Candidates Tournament is currently going on in Moscow from March 11-28. It is an 8 player 14 round double round robin (each player plays every other player twice) https://en.wikipedia.org/wiki/Candidates_Tournament_2016

   The winner of this 8-player Candidates Tournament will be the challenger for the 2016 World Chess Championship against Magnus Carlsen.  The World Championship will be a 12 game match, and is planned to take place between 11–30 November in New York City. https://en.wikipedia.org/wiki/World_Chess_Championship_2016

 
   Here is the complete game:

[Event "World Championship Candidates"]
[Site "Moscow RUS"]
[Date "2016.03.12"]
[EventDate "2016.03.10"]
[Round "2"]
[Result "1-0"]
[White "Sergey Karjakin"]
[Black "Hikaru Nakamura"]
[ECO "E15"]
[WhiteElo "2760"]
[BlackElo "2790"]
[PlyCount "75"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Ba6 5. b3 Bb4+ 6. Bd2 Be7
7. Bg2 d5 8. cxd5 exd5 9. O-O O-O 10. Nc3 Nbd7 11. Qc2 Re8
12. Rfd1 Nf8 13. Ne5 Bb7 14. Bc1 Ne6 15. Bb2 Bd6 16. e3 a6
17. Ne2 c5 18. dxc5 Nxc5 19. Nd3 Nce4 20. Rac1 Rc8 21. Qb1 Qe7
22. Bd4 Rxc1 23. Rxc1 b5 24. b4 Nd7 25. a3 Nf8 26. Ba1 Ne6
27. Qa2 Bc7 28. Nd4 Bb6 29. h4 Nxg3 30. fxg3 Nxd4 31. Bxd4
Bxd4 32. exd4 Qe3+ 33. Qf2 Qxd3 34. Rc7 f5 35. Rxb7 h6
36. Bxd5+ Kh7 37. Bg2 Re2 38. Bf1 1-0

 
   You can play through this game here: http://www.chessgames.com/perl/chessgame?gid=1817779
 
 
   Answer:
 
   This tactic is rather easy, but how it came about is what makes it interesting. 

   Nakamura played a long 5 move combination starting with 29...Nxg3, which wins a pawn, and weakens White's King.

   But the problem is that after the dust settles, white has the above tactic 34. Rc7! which attacks the Black Bishop and hits the f7 square, threatening a checkmate starting with Qxf7+. 

   Dan Heisman calls this a "quiescence error", and is one of the challenges that both computers and humans face - the problem (or refutation) of a move is deeper than you looked - https://en.wikipedia.org/wiki/Quiescence_search
  
   John Herron, author of the excellent book "Total Chess: Learn, Teach and Play the Easy 1-2-3 Way", calls this a Nachzügler.
 
   Nachzügler can be translated as "latecomer" and John defines it as a tactic coming after another tactic.
 
   In section 5.8.1 of his book John writes "A nachzügler tactic (pronounced 'NAHK-tsook-luhr') happens when a tactic by one player leads to a position allowing a tactic by the other player.  The first player does not look ahead far enough to see what will happen after his tactic.  A nachzügler is also called a latecomer, a straggler, or a comeback".


 
   Happy Tactics!
 
   Your Friend,
  Tim
 

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