Annotated Game #360: Don't let that Black knight into e4

A systematic review of your own games inevitably turns up recurring themes in your losses. Ideally, you can then better understand and avoid them in the future, in the process advancing your practical chess knowledge and becoming stronger for it. This next tournament game produced several useful insights for me, including to keep looking for useful ways to play an e-pawn advance in the Colle, but the decisive one was witnessing how my opponent, as Black, obtained his final decisive edge by placing a strong knight on e4. I have lost too many times when this has happened - not just in the Colle - so it is obviously a threat I need to have on my radar. How Black's knights combine in the end to dominate my pieces, along with the queen, makes a strong impression.

[Event "?"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "ChessAdmin"] [Black "Class A"] [Result "0-1"] [Annotator "ChessAdmin / Dragon 3.2"] [ECO "D04"] [PlyCount "72"] [GameId "2340929602847893"] 1. d4 Nf6 2. Nf3 d5 3. e3 c5 {a reverse Queen's Gambit.} 4. dxc5 e6 5. a3 Bxc5 6. b4 Be7 7. Bb2 a5 {Black chooses to immediately challenge the b-pawn. I had not seen this before.} 8. b5 {the correct decision, validated by the engine. Otherwise opening lines on the queenside, or alternatively supporting the pawn again with c2-c3 but shutting in the Bb2, would be better for Black..} Nbd7 9. Be2 $11 {deliberately holding back on c2-c4 for the moment, although now would be the first (and perhaps best?) opportunity to play the pawn break.} Qc7 {I thought that the intent of this move was to restrict c2-c4 - and it probably was - but the engine shows that it can be played anyway.} 10. Nbd2 (10. c4 $5 dxc4 11. O-O {White can afford to keep on with development and then round up the undefended Black c-pawn, with a small advantage. Pursuing materialism would be unhelpful for Black, for example} Nb6 $6 12. Be5 Qc5 13. Bd4 Qxb5 $6 14. Nc3 Qa6 15. Qb1 Nbd5 16. Nb5 Bd7 17. Bxc4 $14) 10... O-O 11. O-O Nb6 12. Be5 $6 {good enough for equality, but White has better.} (12. c4 {and again this is only a temporary pawn sacrifice.} dxc4 13. Rc1 Rd8 14. Qe1 $16 {White will have good play down the c-file and superior minor pieces.}) (12. a4) 12... Bd6 13. Bxd6 Qxd6 14. c4 a4 {controlling b3 and restricting the Nd2.} 15. Qc2 {developing the queen and connecting the rooks.} Bd7 {Black connects his in response.} 16. Qb2 {again, good enough to maintain the balance. The queen moves off the soon-to-be-opened c-file and occupies the long diagonal, once again controlling e5.} (16. e4 $5 $14 {this thematic Colle e-pawn break would give White's position more life.}) 16... Rfc8 17. Rfd1 {activating the rook and placing it on the d-file opposite the queen.} Qf8 18. Ne5 Be8 {this looks a little funny, but correctly preserves the bishop.} 19. Rac1 Rc5 {apparently intending to double rooks on the c-file, so I proceed with the central pawn exchange before that can happen.} 20. cxd5 Rxd5 $6 {an unnecessarily awkward placement of the rook, but I did not take advantage of it.} 21. Ndf3 $6 (21. e4 {is the most direct way, gaining the initiative.} Rc5 22. Rxc5 Qxc5 23. Rc1 Qe7 24. Nec4 Nxc4 25. Rxc4 $14) 21... Rad8 22. Rxd5 Rxd5 23. h3 {here I was cautious and wanted to eliminate potential back-rank mate threats.} (23. Rc7 $5 {does not promise much more.} Qd6 24. Rxb7 Rd1+ 25. Bf1 $11 {White is a pawn up but Black has full compensation with his greater piece activity; White has no remaining threats.}) 23... Qd6 {preventing the rook from getting to the 7th rank.} 24. Ng4 $2 {unfortunately I now run out of ideas and allow Black to establish a strong knight in the center as a result. I recognized it was best to move the knight, but this is the wrong square.} (24. Nc4 {this would at least exchange down further towards a draw.} Nxc4 25. Bxc4 Rc5 26. Bf1 Ne4 {now this is not as threatening.} 27. Rc2 $11) 24... Ne4 $1 $17 25. Nd4 $6 {the centralized knight looks good, but can also be a target.} (25. Nge5 $5 Rc5 $17 {with similar issues, but not as severe.}) 25... Rc5 {now Black does not have an immediate knockout blow, but I cannot cover all of my weaknesses in the medium term, including the back rank, a- and b-pawns, and squares in reach of the Ne4.} 26. Bf3 $2 {the wrong way of kicking the knight. The main defect is that Bf1 is no longer possible to defend on the 1st rank.} (26. Rxc5 {trading down does not work either.} Qxc5 27. Bf3 Nd6 28. Be2 e5 $19) 26... Rxc1+ $1 27. Qxc1 Nc5 $6 {this gives me some breathing room.} (27... Qc5 $1 28. Qxc5 Nxc5 29. Be2 Ne4 $19 {and the engine assesses the endgame is won for Black, due to the aforementioned queenside weaknesses.}) 28. Qc3 h5 {giving the Black king some luft, with tempo.} 29. Nh2 g6 30. g4 {a reasonably good try at activity, but Black has a good counter in the center.} (30. Qb4 $5 e5 31. Nc2 $15 {looks ugly, but at least my kingside is intact.}) 30... e5 $1 31. Nc2 h4 {my opponent played this confidently. At first I thought he had over-reached.} 32. Qb4 {the best practical way to pose problems for Black, as in the above variation. Indeed, my opponent immediately went astray.} Nd5 $6 {my opponent wants to break the pin by counterattacking, and succeeds at that, but my queen now goes to} 33. Qd2 $1 $11 {with an effective new pin on the d-file.} e4 34. Be2 $4 {this "obvious move" retreating the attacked bishop only loses.} (34. Nb4 $1 $11 {the idea here, which I did not seek out, is the tactical trade of pieces} exf3 35. Nxf3 Bxb5 36. Qxd5 $11) 34... Qe5 $17 (34... Nb3 $1 $19 {is even stronger.}) 35. Nf1 $4 {after this useless move, my opponent now finds the devastating} (35. Bf1 Nb3 36. Qd1 g5 $17 {and my position is miserable, but not yet dead.}) 35... Nb3 $1 $19 {as the two knights and queen combine in a highly effective manner.} 36. Qd1 Nc3 {the b-pawn will fall after the Be2 is forcibly exchanged, then Black will simply dominate.} 0-1