15 March 2017

Annotated Game #168: A classic Classical Caro-Kann

This next tournament game features a significantly higher level of play than the previous two, although I get myself in trouble with a small but significant inaccuracy in the early middlegame.  The opening phase is a fine illustration of the Classical Caro-Kann (with 4...Bf5), which my opponent as White played knowledgeably.  I was quite comfortable after the typical pawn break 16...c5, but failed to assert my counterplay as necessary on move 19, handing the initiative over to my opponent.

This defense for some reason has a rather staid reputation, but as occurred in this game it often features opposite-side castling situations where both White and Black need to be careful and also relatively sophisticated with their play.  Here my opponent failed to go for the critical continuation on move 22, allowing me to regain near-equality and think of some possible counterplay of my own, eventually equalizing again.  After another significant error on move 36 on my part, in part due to tiredness' effect on my calculating skill, I weathered some significant pressure (with a bit of luck) and forced a transition to a position where I was down material but could hold the draw, despite my opponent's hopes of me making an error.

Class B - ChessAdmin

Result: 1/2-1/2
B19: Classical Caro-Kann: 4...Bf5 main line
[...] 1.e4 c6 2.d4 d5 3.¤c3 dxe4 4.¤xe4 ¥f5 5.¤g3 ¥g6 6.h4 h6 7.¤f3 ¤f6 8.h5 ¥h7 9.¥d3 ¥xd3 10.£xd3 e6 11.¥d2 ¤bd7 12.O-O-O ¥e7 13.¤e4 this is played about 50 percent of the time, according to the database. White prefers to exchange off the somewhat passive Ng3. 13...¤xe4 14.£xe4 ¤f6 there is no reason not to play this move, which develops the knight to a better square with tempo. 15.£d3 O-O Black has postponed castling for long enough. Here I also contemplated playing ...Qd5, the other major option, but decided on safety first. This is the modern way to play the Caro-Kann, with opposite sides castling and more dynamic strategic tension. Castling queenside is also a legitimate option in many lines, however. 16.¤e5 taking advantage of the absence of the knight on d7 and occupying the central outpost. Black is fine, but needs to take care with White's sacrificial options, which now include sacrificing the knight on f7 or g6, along with the bishop sacrifice on h6. 16...c5 generating counterplay is needed, otherwise White can simply proceed with organizing his kingside attack. This is a typical (and necessary) pawn break in the Classical Caro-Kann. 17.dxc5 £c7 my first significant think, where I decide against the immediate recapture. The queen clears d8 for a rook and develops to a better square for its activity, while simultaneously pressuring e5 and c5. 18.£e2 £xc5 I had another significant think here, although not as long. I eventually decided that leading with the queen on c5 would allow better prospects against White's king position; most of the database games continue this way as well. However, it leaves the Be7 in a somewhat passive role.
18...¥xc5 is preferred by the engines. 19.g4 ¦ac8 20.c3 ¤d5 21.¢b1 ¥d6 22.f4 ¦fe8 23.¦df1 b5 24.¥c1 f6 25.¤d3 e5 26.fxe5 ¥xe5 27.£f3 £c4 28.¤xe5 ¦xe5 29.¦e1 b4 30.¦xe5 fxe5 31.¦d1 ¦d8 32.cxb4 e4 33.£f1 £xb4 34.¢a1 ¦f8 35.£a6 ¤b6 36.£e2 £c4 37.£xc4+ ¤xc4 38.¦d4 ¦f1 39.¦xc4 0-1 (38) Fedorchuk,S (2503) -Khenkin,I (2609) Ohrid 2001 CBM 084 [Lukacs]
19.g4 my opponent plays aggressively and immediately advances a pawn for the attack, which is consistent with the needs of the position. 19...¦fd8?! a significant inaccuracy. Black needs to assert his counterplay immediately as well, which is best on on the c-file. (19...¦ac8 20.c3 ¥d6 21.f4 £d5) 20.g5²20...¦ac8 now that the Nf6 is hanging, this move to the c-file has less impact, since Black will have to respond to the threat to the knight after White's obvious next move. (20...¤d7 21.¤xd7 ¦xd7 22.gxh6 ¥g5²) 21.c3 hxg5 another significant think here. I concluded that getting rid of the g-pawn would do the most to reduce White's attacking chances. Komodo doesn't fully agree with me. (21...¤d7 22.¤xd7 ¦xd7 23.gxh6 ¥g5²) 22.¥xg5 not the critical continuation.
22.h6 g6² so White is better here, but has to find the not so obvious idea of moving a rook to e1 to continue the attack. 23.¦de1 (23.¥xg5 ¦xd1+ 24.¦xd1 ¤d5 25.¥d2 ¥f6 and Black is OK.) 23...£d5
23...¤h7?24.¤xf7 a thematic sacrifice 24...¢xf7 25.£xe6+ ¢f8 26.£xg6±
22...¦xd1+ this seemed the easiest way to further reduce White's attacking chances, getting a rook off the h-file and additional material off the board.
22...¦d5 is suggested by the engine and was a possibility I considered for a while. Eventually I didn't see enough utility in the move after White's response f4. 23.f4 ¦cd8 and now Black can also liquidate material effectively, for example 24.h6 ¦xd1+ 25.¦xd1 ¦xd1+ 26.£xd1 gxh6 27.¥xh6 £e3+ 28.¢b1
23.¦xd1 ¤d5 played with the idea of getting counterplay going. White's c3 pawn is currently pinned and can be a good sacrifice target, while the knight can also go to b4 as a result. (23...¦d8 would continue of the original idea of reducing material.) 24.¥d2 Essentially a forced concession by White, as the alternative of swapping bishops on e7 would leave him with even fewer prospects. 24...¥f6 I thought for a while here and was unsure if the bishop move would be the most effective, but in the end decided that the added pressure on the long diagonal was a good thing. I considered that my opponent's most likely response (which he did play) would lead to an equal game.
24...¤b4 I also considered, but did not see much of a point after 25.¢b1 The engine offers 25...¤c6 as a possibility, however, which is a good way of getting rid of the Ne5 without ending up with a knight vs. bishop situation as in the game continuation.
25.h6!? is of course more testing. 25...£c7 26.f4 ¥xe5 (26...g6!?) 27.fxe5 £c4 28.£g2 g6 29.a3 ¢h7 30.¦f1 ¦f8 31.¥g5 £c7 with a slight edge to White.
25...£a5 the correct response, threatening the a-pawn and maintaining the latent pressure along the 5th rank against the h5 pawn. An example of dynamic play. (25...£c7 would of course be perfectly adequate as well.) 26.¤xf6+ ¤xf6 27.¢b1 the obvious "safe" choice, jettisoning the h-pawn, but not necessary.
27.h6 is an aggressive try. 27...£xa2 28.£e5 £a1+ 29.¢c2 £a4+ 30.¢c1 £e4
27.£f3 £xa2 28.£xb7 £a1+ 29.¢c2 £a4+ 30.¢c1 and Black can head for a draw by repetition.
27...£xh5 here I thought about the intermediate check on f5, but did not see how it would be of good use. The engine considers the alternative to be superior, however, likely due to the fact that the king on a1 is further from the action in the endgame, while also being more vulnerable to back-rank threats. If the king goes to c1, then the c-pawn is again pinned and the a-pawn again unprotected.
27...£f5+ 28.¢a1 £xh5 29.£xh5 ¤xh5 White's bishop is better than the knight and the rook is better positioned on d1 as well, but a pawn is a pawn. 30.¥e3 a6 31.¦d7 ¦b8³
28.£xh5 essentially forced, otherwise Black's queen is much better positioned for action. 28...¤xh5 now we have the same position as in the above variation, only with White's king one square closer to the center, making the value of the intermediate check (a "tempo move") more clear. 29.¥e3 b6 blocking the Be3.
29...a6 was the other possibility I considered. Both it and the game continuation are OK for Black, although it might have been a bit easier to play this variation's positions. 30.¦d7 b5 31.¦d6 ¦a8
30.¦d7 ¦a8 31.¢c2 (31.¥d4 ¤f6 32.¥xf6 gxf6) 31...¤f6 32.¦b7 ¢f8 played on the general principle of bringing the king closer to the center, but also with an eye towards possibly trapping White's rook, if he makes an error. 33.¥f4 ¢e8 34.c4 taking the d5 square away from the knight. 34...¤d7 White is still fine, but the Rb7 is uncomfortable with so few squares. 35.b4 (35.¥d6 ¦c8 36.¥c7 a5) 35...¢d8 around here I started to get tired, which was reflected in the quality of my calculations, although I'm still able to see key ideas. The immediate ...e5 would be better, kicking the bishop first.
35...e5 36.¥e3 ¢d8 37.c5 otherwise the rook is trapped 37...bxc5 38.bxc5 ¦c8
36.¥d6 e5?! as I've often noted in my analysis, another example of the right idea but played a tempo too late, thereby creating problems. Here I was thinking about trapping the bishop, too, but it doesn't work out. (36...¢c8 37.¦c7+ ¢d8 with the idea of ...a5 to follow up.) 37.¢d3² simple yet effective. Now the c-pawn is protected, reducing my potential threats. 37...f5? here I needed to play the key ...a5 idea. The text move looks good, keeping the king from penetrating via e4, but now White's queenside pawns can effectively mobilize.
37...a5 38.c5 now this advance is opposed 38...¦c8 39.bxa5 bxc5 40.¦a7²
38.f3?! simply marches past the door to victory, comments Komodo via the Fritz interface.
38.c5! wins: 38...bxc5 39.bxc5 ¢c8 (39...¦c8 40.¢c4 a6 41.¢d5+⁠−) 40.c6!40...¤b8 41.¥xe5+⁠−
38...g5?! still not adequately seeing the danger on the c-file. (38...¢c8 39.¦c7+ ¢d8 40.c5 bxc5 41.bxc5 ¦c8 42.¦xa7 ¤xc5+) 39.c5± now my opponent puts on the pressure, but this time he's the one who plays the correct move a tempo late, to less effect. 39...¦c8 40.¦xa7?! my opponent's choice of going for the material allows me to equalize again, now that my rook can become active. (40.¢c4!?40...bxc5 41.bxc5± maintains the pressure.) 40...bxc5 41.bxc5 ¤xc5+ 42.¢e3 f4+ a tough decision and a relatively long think here, but a correct one. White's king is pushed back by the combination of knight and pawns. 43.¢e2 e4 played after another relatively long, difficult think. I still harbored some hopes of being able to do something with the kingside majority, but this is not possible in the end.
43...¦c6 would have been an easier path to a draw. 44.¥e7+ (44.¥xc5 ¦xc5 45.a4) 44...¢e8 45.¥xg5 ¤e6
44.¥e7+ I had seen this far... 44...¢e8 45.¥xg5 but now I realized that my planned ... Ne6 would fail to Re7+, so I have no choice but to liquidate and go for a drawn endgame. 45...exf3+ 46.¢xf3 ¦c6 I was pleased to find this idea, in fact the best, which is in keeping with the principle of emphasizing rook activity. After the f-pawn goes, I force a rook exchange and White cannot win with his remaining material. 47.¥xf4 ¦a6 48.¦xa6 ¤xa6 we could have stopped playing here, but my opponent wanted to see if I would commit an error. As long as the knight avoids domination or exchange by the bishop and Black gets his king over in front of the pawn, it's a draw. 49.¢e4 ¢d7 50.¢d4 ¢c6 51.¢c4 ¤c5 52.¥e3 ¤a6 53.a4 ¢b7 an illustration of how ineffective a lone bishop can be in the endgame; in this case, Black dominates the light squares and therefore draws. 54.¢b5 ¤c7+ 55.¢a5 ¤d5 56.¥d4 ¤c7 57.¢b4 ¢a6 58.¥e5 ¤d5+ 59.¢b3 ¤b6 the knight now can fulfill his destiny and end the game. 60.¢b4 ¤xa4
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