I tried a lot of variants to induce checkmate or gain material by moving the recommended move Qc1. I tried it instead of Nc4, which the engine considers a blunder. However, I cannot solve why it is the best move.

[FEN ""]
[StartPly "28"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Qf6 4. d3 Nge7 5. Bg5 Qd6 6. Bh4 Ng6 7. Ng5 Qb4+ 8. Nd2 Nxh4 9. Bxf7+ Ke7 10. O-O d6 11. Bb3 Nd4 12. c3 Qb5 13. cxd4 Qxd3 14. dxe5 dxe5 15. Qc1 (15. Nc4)
  • 7
    Ask the enemy king if he'd like the queens to go off the board! – David May 13 at 6:49

Consider the position before 15. Nc4.

[FEN "r1b2b1r/ppp1k1pp/8/4p1N1/4P2n/1B1q4/PP1N1PPP/R2Q1RK1 w - - 0 15"]

You have developed two knights, a bishop, and castled. Your opponent has developed a queen and a knight, and his king is stuck in the center.

In other words, you have a massive dynamic advantage! You are already in position to leverage your superior development & king safety and steamroll your opponent off the board. There are plenty of ways to do so - Rc1, Qc1, Qh5, they all produce immediate threats against your opponent's king that are hard to fend off. These moves even come with tempo because Black can hardly allow Qxc7+ or Qf7+.

Nc4, on the other hand, allows your opponent to trade queens. When you are on the attack this is one of the things you least want to do, because the queen is the most powerful piece and hence also the most powerful attacker. After 15. Nc4 Qxd1, you still have a comfortable advantage, but you are no longer playing for immediate checkmate.

I haven't looked at the computer's suggestions and it probably sees something more concrete, but still: on general grounds, trading queens in this position is a bad idea. By extension, that makes Nc4 an inferior move.

  • 1
    Concerning the "concrete", assume I would play Black in a blitz game (I usually stand this way in the opening :-), and the opponent triumphantly plays Nf7, attempting a boring win by material after Rg8 Nxe5. I play a tempo Bh3, which is of course just a big swindle, but the standard way for me to win completely lost positions. :-) Thus, it makes very much sense to rather play Qc1,Rd1 instead of e.g. Rc1,Rc3 and engage the biggest gun first. – Hauke Reddmann May 13 at 9:09
  • (Note that Nf7 instead of Qc1 still wins, engine suggesting grin and bear it with Ng6, it's just +6 where Qc1 is +8, for what tactical finesses ever, e.g. the Q indirectly protecting Ng5) – Hauke Reddmann May 13 at 9:38

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.