Chicago Defense

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The Chicago defense after 6. Bf1 – c4.

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a typical position.

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The Chicago Defense is a variant of the Morra Gambit , an opening to the game of chess . It arises after the trains

1. e2-e4 c7-c5
2. d2-d4 c5xd4
3. c2-c3 dxc3
4. Nb1xc3 e7-e6
5. Ng1 -f3 a7-a6
6. Bf1-c4

and the following … b7 – b5,… d7 – d6,… Re8 – a7 and Re7 – d7. The rook is there to defend the queen against a white rook on d1. The d-pawn is then not tied to the queen as in many other variants of the Morra gambit. Due to the tower maneuver, the opening has some similarities with the Polugajewski variant in the Najdorf variant . The variant was played by Nakamura and Dzindzichashvili, among others . The disadvantage is the underdeveloped black kingside. White can open the position under sacrifices and start an attack on the king. Since the rook on d7 prevents the c8 bishop from defending the e6 pawn, a piece sacrifice on e6 gains strength.

variants

  • 6.… b7 – b5 7. Bc4 – b3 d7 – d6 8. 0–0 Ra8 – a7 ?!
  • 6.… d7 – d6 7. 0–0
    • 7.… b7 – b5 8. Bc4 – b3 Ra8 – a7 ?! 9. Bc1 – e3 Attacks the rook and forces it to the planned position 9.… Ra7 – d7 10. Nf3 – d4! A kind of Sosin variant with an increased tempo for White. The knight can now attack e6 or the queen on d8 via c6. 10.… Ng8 – f6 (10.… Bb7 11. f4!) 11. f2 – f4 Bc8 – b7 (11.… b4 !? 12. e5!) 12. f4 – f5 e6 – e5 !? 13. Nd4 – f3! (13. Nd4 – e6!) Exf4 !? is probably the best move, but it ends in a strategically lost game. 13.… Bf8 – e7? prepares castling. 14. Bb3xf7 +! Ke8xf7 15. Nf3 – g5 + Ke8 16. Ng5 – e6 Qd8 – a5 16. Nxg7 +!
    • 7.… Nb8 – c6 (prevents Nf3 – d4) 8. Qd1 – e2 b7 – b5 9. Bc4 – b3
      • 9.… Bf8 – e7 10. Rf1 – d1 Ra8 – a7 11. Bc1 – f3 (11. e4 – e5 !?) Ra7 – d7 12. Nc3xb5! axb5 13. Qe2xb5 White sacrifices a knight for only one pawn, but receives a strong attack. If Black manages to return material to weaken the attack, White still has two connected passed pawns on the a- and b-file. 13.… Bb7 14. Ba4! Nf6 15.Nd4!
      • 9.… Ra8 – a7 10. Bc1 – e3 Ra7 – d7 11. Rf1 – d1 !! (11. Nd4 !? loses too much time and allows Black to swap a piece. 11. Nxb5 !? axb5 12. Qxb5 Nge7!)
        • 11.… Ng8 – f6 (Now the move Ng8 – e7 is no longer available to Black) 12. Ng3xb5! axb5 13. Qe2xb5 Bf8 – b7 14. Bb3 – a4!
        • 11.… Bf8 – e7 12. Nc3xb5! axb5 13. Qxb5 Bb7 14. Ba4
        • 11.… Bc8 – b7 12. Nf3 – g5! After the bishop has left the c8-square, the e6 defense has become too weak. 12.… Ng6 (12.… h6 13. Nxe6) 13. f4!

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