Annotated Game #341: The lurking Colle

In this second-round tournament game, my opponent initially struggles with her unfamiliarity in the opening (a Colle-Zukertort) but eventually a small error is made leading to much greater vulnerabilities and a relatively quick breakthrough for White on the kingside. Broadly similar to Annotated Game #339 and others, I've seen a recurring pattern in the Colle where White obtains no actual advantage out of the opening, but like a shark lurks in calm waters, waiting for the opponent to offer up some tasty meat. There are no spectacular sacrifices here, although there is a tactical forced end sequence - just an illustration of how White's pieces can quickly activate in a threatening, sometimes decisive manner. At the same time, analysis shows how patience and constant pressure can also be required, as in the note to move 16.

[Event "?"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "ChessAdmin"] [Black "Class C"] [Result "1-0"] [Annotator "ChessAdmin/Dragon 3.2"] [ECO "D05"] [WhiteFideId "-1"] [BlackFideId "-1"] [PlyCount "55"] [GameId "2277541253412298"] 1. d4 d5 2. Nf3 Nf6 3. e3 Bf5 {my opponent took a long time thinking about her response, indicating an unfamiliarity with the Colle.} 4. Nh4 Bc8 5. Nf3 {by repeating the position, the ball is now back to my opponent, who again has to think again about what to do, and this time chooses the main line symmetrical option.} e6 6. Bd3 Bd6 7. b3 (7. Nbd2 {is a bit more flexible option, also controlling the e4 square.}) 7... c5 8. Bb2 (8. dxc5 $5 {is the only way to take advantage of Black's move-order with the early ...Bd6, but does not lead to much.} Bxc5 9. Nbd2 $11) 8... O-O 9. Nbd2 Nc6 10. O-O (10. dxc5 $5 {is again the best try for advantage.} Bxc5 11. a3 a5 12. c4 $14 {may give White a little more with the small space advantage on the queenside.}) 10... b6 {we have now transposed to the main line with a Black Nc6/Bd6 setup.} 11. Ne5 Bb7 12. f4 {I decided on the direct approach here.} (12. a3 {would be a useful prepatory move, controlling b4.}) 12... cxd4 (12... Nb4 13. Be2 {isn't the end of the world, but it still gives Black more than necessary, with at least an extra tempo before the knight gets kicked with a2-a3.}) 13. exd4 {keeping pieces on for a potential kingside attack.} (13. Nxc6 {is a more standard Colle approach.} Bxc6 14. Bxd4 $11 {and the dark-square bishop still has the long diagonal to work with.}) 13... Nd7 $6 {the first real error by my opponent. While still not terrible here, it's rarely a good idea to remove the Nf6 from the kingside defense if you are Black. And if you are White, look to take advantage of it.} 14. c3 $14 {the engine validates my choice here. Now b4 is belatedly controlled, meaning my bishop stays good on d3, and my pieces are poised for kingside action.} Ncxe5 $2 {while this eliminates White's centralized knight, the pawn replacing it on e5 is even stronger, while the f-file is opened.} 15. fxe5 Bc7 $2 {this compounds the problem, as the bishop is now walled off from the fight.} (15... Be7 $18 {at least the a3-f8 diagonal is now covered.}) 16. Qh5 $18 {the second best move, according to the engine.} (16. Ba3 $18 {I debated playing this first, which the engine considers stronger. Black essentially has to sacrifice the exchange, for example with} f5 17. Bxf8 Nxf8 $18 {but now White can continue to carefully build up an attack, or simply go for simplifications being material up.}) 16... h6 (16... f5 17. Ba3 Qe8 {might be Black's best practical try. One sample line:} 18. Qh3 {continues trying to press the attack} Rf7 19. g4 g6 20. Nf3 Bd8 21. gxf5 exf5 22. e6 Qxe6 23. Rae1 $18) 17. Ba3 {Black is now losing material.} f6 $2 {this allows White's next sequence, which I calculated carefully.} (17... f5 18. Bxf8 Qxf8 19. Rf2 $18) 18. Qg6 {the queen infiltrates} f5 {forced} 19. Qxe6+ $1 {is of course much better than cashing in immediately with} (19. Bxf8 Nxf8 $18 {with better defensive prospects for Black.}) 19... Kh8 20. Bxf8 Nxf8 21. Qxf5 {being up the exchange and two pawns, it was just a matter of patiently converting the win. Black's open king position and lack of escape squares made it relatively quick.} Qe7 22. Qf7 {exchanges are great for White} Qd8 23. Rf3 Rb8 24. Raf1 Bd6 {my opponent clearly saw the following sequence, but I expect was one of those juniors taught to never resign, regardless of the position on the board.} 25. exd6 Qxd6 26. Qxf8+ Rxf8 27. Rxf8+ Qxf8 28. Rxf8# 1-0