quarta-feira, 15 de maio de 2013

Xadrez - Mate em 10! (Magnus Carlsen)

Sergey Karjakin vs Magnus Carlsen, Sandnes (Noruega), 13/05/2013.
Código FEN: 6k1/1b3qp1/8/4r2p/1P1Q2P1/2p4P/7K/3B2R1 b - - 2 46.

As Pretas jogam e dão xeque-mate em 10 lances!
(Black to play and give checkmate in 10 moves!)

Esta posição foi alcançada anteontem, em um torneio disputado pelos melhores enxadristas da atualidade, na Noruega. Magnus Carlsen encontrou o movimento-chave, e Sergey Karjakin abandonou.
(This position was reached the day before yesterday, in a tournament played by the best chess players of today, in Norway. Magnus Carlsen found the key move, and Sergey Karjakin resigned.)

PCFilho

8 comentários:

  1. too tough to try with this headache I now have

    ResponderExcluir
  2. Yes, Rameish, this is a very tough problem.

    Finding the first move is not that difficult, I think.

    But calculating the whole sequence of moves is certainly a hard task, even for experienced players.

    PS: I hope your headache goes away soon. :)

    ResponderExcluir
  3. I am just a beginner, so forgive me if I am wrong, but I guess I found the solution.

    1..c2:
    2Qxe5 Qe2#
    or
    2.QE8(check)Re8
    3.Qd2 c1
    4. Qxc1 Qf2#
    or
    2.Bc2 Re2
    3.Kg3 Qf3#
    or
    2.QE8(check)Re8
    3.Qxe8(check) Qe8
    4.Bxc2 Qe5(check)
    5.Rg3 Qf2(check)
    6.Kg1 Qe1
    7.Kh2 Qh1#

    I dont see any more solutions, so probably I must be wrong because it's 'mate em 10' :)
    I tried my best anyways!

    ResponderExcluir
  4. b111cb3a...

    1. ... c2 was the 1st move I considered when I analyzed this position.

    I discarded it because of the following continuation:
    2. Bxc2 Re2+
    3. Rxc2 (Qf3+ is not checkmate)

    I think Black will win this continuation, but it will certainly take more than 10 moves.

    The key move is better than 1. ... c2.

    ResponderExcluir
  5. Correction in my last comment:
    3. Kg3 Rxc2 (Qf3+ is not checkmate)

    ResponderExcluir
  6. Thank you, PCF; I had a good night's sleep, and the headache is now gone. But this problem is potential of bringing it on again. I see a good first move in Qc7; but I fail figuring the opponent's response, and without that, I can't proceed further. I lack patience of thought. All I can say is that I would play 1. Qc7 and then proceed after seeing what the opponent plays.

    ResponderExcluir
  7. You are right, Rameish! 1. ... Qc7!! is the key move.

    This move does really a lot of things:
    1) prevents the White Queen from coming to d8;
    2) supports the Pawn on c3;
    3) creates many threats of discovered checks (by moving the Rook on e5).

    It's just too much for White to deal with. There are many possible lines, but with best play, Black will always win in 10 or less moves. I'll show some of these lines below:

    1. ... Qc7!!
    2. Bb3+ Kh8
    3. Kg3 Rd5+
    4. Kh4 Qe7+
    5. g5 Rxd4+
    6. Rg4 hxg4
    7. Bd5 Bxd5
    8. hxg4 Qe1+
    9. Kh5 Qh1+
    10. Kg6 Qh7#

    1. ... Qc7!!
    2. Bb3+ Kh8
    3. Kg3 Rd5+
    4. Kh4 Qe7+
    5. Qf6 Qxf6+
    6. g5 Rd4+
    7. Rg4 Rxg4+
    8. hxg4 Qf4
    9. Kxh5 Be4
    10. Be6 Qh2#

    1. ... Qc7!!
    2. Bb3+ Kh8
    3. Kg3 Rd5+
    4. Kh4 Qe7+
    5. g5 Rxd4+
    6. Rg4 hxg4
    7. hxg4 g6
    8. Bd5 Rd3
    9. Bf3 Rxf3
    10. b5 Qe1# or Qh7#

    1. ... Qc7!!
    2. Rg3 c2
    3. Bf3 h4
    4. Qf2 hxg3+
    5. Kxg3 Re2+
    6. Kh4 g5+
    7. Kh5 Qh7+
    8. Kxg5 c1=Q+
    9. Qe3 Qxe3+
    10. Kf6 Qf4# or Qe5# or Qee7# or Qeh6# or Qf7#

    1. ... Qc7!!
    2. Rg3 c2
    3. Bf3 h4
    4. Qf2 c1=Q
    5. Bxb7 Re2
    6. Bd5+ Kh8
    7. Bg2 Rxf2
    8. b5 hxg3#

    If anyone wants to bring up a new line for discussion, feel free to do it. :)

    ResponderExcluir
  8. So many bad options for white and no good one; that's why I couldn't figure white's response to my Qc7! Thanks for the analytic details, PCF.

    ResponderExcluir

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