In this case, after an up-and-down opening (first up, then down), I blunder the exchange - although if you win in the end, you can call it an "unintentional exchange sacrifice". After the "sacrifice" I do fight well for compensation, while in contrast my opponent plays passively and focuses on attempting to trade down material, without much else in terms of a plan. I spot a possible tactic after my opponent weakens his kingside with 27...g6?! and eventually get the chance to execute it, leading to a breakthrough and a win. (By coincidence - or perhaps not - this matches up nicely with ideas in the recent "importance of sequencing" post).
While reviewing my initial notes in the database, I was struck by how the final result colored my outlook on the entire game. My opening play was initially fine but then got significantly weaker as I approached the middlegame, which is a recurring pattern that I've identified (so will now fix, as in Third Time's the Charm). Specifically, one of my main recurring errors has been neglecting development and allowing my opponent to restrict my pieces, which always brings problems with it. I should have been harsher (or more realistic) during my earlier evaluation and recognized that the narrative of triumph after the "unintentional sacrifice" was due less to my abilities - although I did find some correct ideas - rather than my opponent's passivity and creation of unnecessary weaknesses.
ChessAdmin - Class C
[...] 1.c4 ¤f6 2.¤c3 e6 3.¤f3 d5 4.e3 c6 5.b3 ¥b4 this was a little surprising, I felt that ...Bd6 would be more in keeping with Black's Semi-Slav type setup. 6.¥b2 O-O 7.£c2 £d6 this seemed like a premature development of the queen, as well as restricting the Bb4's retreat squares. We are now out of the database. 8.a3 the obvious reaction, inconveniencing the bishop. 8...¥a5 9.b4 continuing with the theme of pushing back Black's pieces and gaining space on the queenside. Perhaps not most effective, however. The bishop on a5 is not doing much and represents a waste of time for Black, while the new square it goes to is more useful.
9.d4!? would get space in the center and make a the follow-on Bd3 development logical.9...¥c7 10.c5 this does nothing for my development and leaves Black's d-pawn looking stronger. (10.¥e2 dxc4 11.¥xc4²) 10...£e7 11.¥e2 again, d4 is logical but would have the disadvantage of shutting in the Bb2. 11...b6 challenging the pawn chain at its top. 12.cxb6 axb6 13.O-O ¥b7 Black continues with a rather slow development plan. 14.¦fd1 ¤bd7 although I felt that Black had not played the opening particularly well, at this point his development is fine and a bit better coordinated than mine. He is certainly better positioned in the center for space. Komodo gives a slight edge to Black. 15.d3 in the expectation that the following sequence would occur. 15...e5 16.e4 d4 17.¤b1 c5?! this seems like an obvious move at the Class level, to advance and support the d4 pawn, but with Black having gained space and restricted my pieces, this just allows me to get some breathing space on the queenside. (17...b5!? would lock things up to Black's advantage.) 18.bxc5?! (18.¤bd2 would help with my neglected piece development.) 18...bxc5 this is what I had expected.
18...¤xc5! and now Black will dominate the queenside, likely winning the a-pawn and causing major problems once his bishops get further into play from d6 and c6.19.¤bd2 ¥c6 here I failed to ask the question in my thinking process, what did my opponent's move change about the position? What new CCT does he now have available? 20.¤c4? this leads to an unintentional exchange sacrifice. I spotted Black's skewer tactic immediately after moving. I therefore played the next couple of moves rapidly and with confidence, since there was nothing else to be done. (20.¦dc1) (20.a4) 20...¥a4µ21.£d2 ¥xd1 22.¥xd1 a key part of the sequence for White, capturing with the bishop rather than the queen. The bishop will be repositioned to a much better square, serving as partial compensation for the sacrifice. 22...¤b6 normally it's a good idea to simplify with piece exchanges in order to magnify a material advantage, and this was presumably my opponent's main idea here. However, this benefits me by accelerating the activation of my light-square bishop. (22...¦fb8) 23.¤xb6 ¥xb6 24.£g5 I felt this was necessary to develop counterplay. The queen has to be activated and has a relatively open field in front of the Black king. The pin on the Nf6 will also lose Black some time. 24...¦fe8 unpinning the Nf6. 25.¥b3 While Black is still comfortably winning on objective measures, this bishop now becomes a monster on the a2-g8 diagonal and its pinning of the f7 pawn will eventually be the decisive factor in the game. 25...¥c7 clearing the b-file for one of Black's rooks and reinforcing e5. However, a Black rook never ends up on the b-file. 26.¥c4 anticipating future possible pressure down the b-file. 26...¤d7 offering a queen trade. 27.£h5 naturally I avoid trading queens and maintain some pressure on Black's kingside, adding h7 as a target and attacking f7 again. Ng5 now becomes a potential threat. 27...g6?! unnecessarily weakening the squares in front of the Black king.
27...¤f6 is what I was expecting. 28.£g5 and we try again with the position.
27...¦f8 is the engine's choice, but this sort of defensive move can be psychologically hard to play, especially since the rook had just recently moved away from f8.28.£h6 £f8 this apparently was the idea behind the previous move, but this ends up placing Black's queen on a much more awkward square. 29.£h3 ¤f6 in contrast with the previous situation, now the Nf6 is not protected. 30.¥c1³ bringing another piece around to exert pressure and materially improving the evaluation for White, as previously the dark-square bishop was locked out of the game. Part of my compensation for being down an exchange is that I am able to use both bishops and the knight effectively to attack the kingside, along with the queen, while Black has only the queen and knight defending the kingside. 30...h5 31.¥g5?! wrong piece. The bishop is doing fine on the c1-h6 diagonal where it is, while the knight could do better on g5. Attacking the Nf6 is not much of a threat in reality, although it does prompt my opponent to play an awkward follow-up move.
31.¤g5 would target f7 and increase the pressure. 31...¦e7 32.£h4³31...¥d8
31...£d6µ is much better, getting the queen to a more effective square.32.£g3 leaving the diagonal and shifting the queen's target to the now underprotected e5 pawn. 32...¤d7? missing the following tactic, one which I had spotted as a possibility after 27...g6, based on the pin of the f7 pawn. I believe my opponent was still focused on a general plan of trading down material. (32...£d6) 33.¥xd8+−33...¦axd8 34.£xg6+ ¢h8 (34...£g7 35.¥xf7+ ¢f8 36.¥xe8 ¦xe8 37.£xh5+−) 35.£xh5+ ¢g7 36.£g4+ I thought for a while before making this move. I wanted to bring another piece (the Nf3) into the attack by leaving the g5 square open for it. 36...¢h8 37.¤g5 now the combination of mate threats plus the attack on f7 decide the game. 37...¤b6 38.£h5+
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