09 December 2012

Annotated Game #74: Round 3 - Round Turkey Tournament

This final round of the 2012 Round Turkey Tournament was the decisive one, as any of the players could theoretically have won it.  I had no idea how Tim Clark (aka Moth) was going to open the game, although I did prep the Caro-Kann Advance variation to some extent, since it is a popular choice for White these days.

Black has a relatively easy time of it in the opening and by move 9 has his pieces comfortably placed.  I decided not to get too fancy in the early middlegame and was thinking about quietly increasing the pressure on the d-pawn when White threw in the tactical surprise of 15. Nxd5.  Black is objectively fine here, but the failure by both of us (apparently) to spot the key ...Nxe5 countermove - made possible by the unprotected White queen on d3 - is quite instructive.  I had the mental assumption when both queens were on the d-file that opening the file would not do anything, only seeing the ...Nxe5 possibility once I had a rook on d8.  This is a good example of how doing a general tactical status check can be a help (and should be a regular feature of one's thinking process).  (I first saw this idea expressed in Understanding Chess Tactics by Martin Weteschnik.)

Despite missing the best reply, I manage to hang on and after the sequence is completed, regain equality.  White nevertheless retained what initiative was left in the position and I soon felt under pressure again after he pushed in the center with 24. d5.  Further inaccurate defending by Black leaves him with a somewhat scary-looking position as of move 29, although it was still objectively OK.  Attempting to counterattack in the center, I play Rxe3, which would have lost had White taken the fleeting opportunity to play d6 that was presented by Black's overloaded pieces.  Luckily for me, I immediately extricated myself and then was able to head for a setup that would force perpetual check.

My opponent didn't want to accept a draw, though, so decided to roll the dice with a rook exchange that lost him two pawns, leaving us with a R+P endgame featuring three Black kingside pawns versus two White kingside pawns.  With time growing shorter, White got very aggressive and failed to do a CCT (checks, captures and threats) check on move 41, allowing White's rook to check and then pick up the b-pawn.  The end came quickly afterwards.

My thanks to Tim for playing an interesting and strong game, which gave me a lot to look at during analysis.

For anyone else who wants to join the fun during the next cycle, the 2012 Double My Egg Nog FICS tournament still has a space available.

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B12: Caro-Kann: Advance Variation 1.e4 c6 2.d4 d5 3.e5 the Advance Variation is now the de facto main line, in terms of frequency of play at the professional level. c5 Black is willing to sacrifice this pawn for improved piece play. White decides not to accept. 4.c3 Nc6 5.Nf3 Bg4 NOT ...e6 before letting the bishop out. 6.Be2 e6 7.Be3 Nge7 Qb6 is the major alternative in the database. I instead opt to get the kingside developed. 8.h3 leading to a trade of minor pieces, as retreating the bishop would cramp Black and invite the g4 thrust. Bxf3 9.Bxf3 Nf5 here I consider Black's position as very comfortable, with superior activity for his minor pieces. 10.0-0 around here is when I start thinking about playing ...Qb6, but never do. cxd4 an amateur move, relieving pressure on d4 just to make things less complicated. 10...Qb6 is Houdini's choice, protecting c5 again and pressuring b2. At the time, I didn't like the fact that taking multiple times on d4 would just end up with a Black knight pinned to the queen by the Be3, but there were other good reasons for the queen development, to ratchet up the pressure on White. 11.cxd4 Bb4 this seemed to me to have better long-term prospects than development to e7, and gives the bishop the retreat to b6 (to target d4) as an option. 12.Nc3 0-0 13.Qd3N Whtie is now out of the database (with Houdini's preferred move). This connects the rooks and usefully centralizes the queen on the b1-h7 diagonal. Rc8 Black completes his initial development. 14.Rac1 Ba5 after thinking for a fair amount of time on my initial middlegame plan, I had settled on pressuring d4 some more, with ...Bb6 to follow. 15.Nxd5 this came as a tactical surprise, using the theme of the overloaded pawn at e6, which was protecting both f5 and d5. 15.Bg4 is Houdini's preferred alternative. Nxe3 16.fxe3 Qg5= 15...Nh4 Black has a cramped position, comments Houdini. This move is certainly a little awkward. 15...exd5? 16.Qxf5 15...Nxe3 would have been the easier route. 16.Nxe3 Nxe5 ; however, I didn't spot the possibility of capturing the e5 pawn while exploiting the pin on the d-file until later. 16.Nc3 16.Nf4 was necessary to protect the hanging Qd3 and therefore prevent the threatened Nxe5; however, neither my opponent nor myself spotted the capture at this point, due to a failure to recognize the status of the queen. 16...Nxf3+ this line still gives Black an advantage, even if not optimal. 16...Nxe5 17.Qe4 Nexf3+ 18.gxf3 and White's position is full of holes. 17.gxf3 Qh4?! I had fixated on the idea of penetrating with the queen here, although I knew White could easily defend in the short term. 17...Nxe5 18.Kh2= Rcd8 Interestingly, it was only when considering this move, where the rook takes the queen's place on d8, that I spot the Nxe5 threat. The move increases pressure on the backward pawn d4 and re-establishes the pin. 19.Ne2 this reduces the effectiveness of the knight and still allows Black to regain the pawn. 19.Qe4 immediately would probably be the best way for White to resolve his issues via simplification. Qxe4 20.Nxe4 Bb6= and now that Black's queen is no longer on the board, he can't take advantage of White's kingside weaknesses, although he will have easy equality after regaining the d4 pawn. 19...Nxe5 20.Qe4 Qxe4 21.fxe4 I thought for some time here about the various knight jumps, but eventually settled on retreating to c6, not seeing what I would get concretely out of ... Nd3. Nc6 21...Nd3 22.Rb1= is still Houdini's preferred line. The point is that the Nd3 can't be directly challenged by White without creating other problems in his position. 22.Rg1 a rather transparent threat to play Bh6 as a follow-up. g6 the most obvious way to defend. 22...Rfe8 is a better defense, removing the rook from the line of fire. This would have effectively saved a tempo for Black - g6 does nothing for him - as well as better anticipating White's coming d5 push. 23.Rgd1 Bb6 24.d5 Bxe3 25.fxe3 Ne5 I had to think about this one for a while as well, although there was less of a choice available than with the previous knight move. Houdini approves. 26.Rc7 the critical (and obvious) try for White. Rc8 27.Rdc1 with time getting shorter, my thinking process started breaking down around here, as I didn't even consider this possibility for White. 27.Rxb7 fails due to Rc2 which will win the Ne2 because of the pin on the Kh2. 27...Rcd8 the riskier play, as at the time I didn't like the alternative. 27...Rxc7 is fine, however as 28.Rxc7 exd5 29.exd5 Rd8 30.e4 Rd7 and Black is equal, being able to stop the pawns with his piece blockade. 28.Nf4 exd5 29.exd5 Black is still OK, although that pawn on d5 sure looks good for White. Rfe8 continuing the aggressive and risky play 29...b5 is Houdini's inspired choice, creating an outpost for Black on c4 that allows him to compensate for White's rampaging rook on the 7th rank. 30.Rxa7 Nc4 30.Rxb7 Nf3+ 31.Kg2 White threatens to win material: Kg2xf3 Rxe3? this is shown by Houdini to lose for Black, although it's not obvious at this point why it should. 31...Nh4+ 32.Kf2 Nf5 32.Kf2+- one should not forget that the king can also fork (double attack) different pieces! Rde8 33.Rcc7 33.d6! instead would win for White. Now the Re8 is overloaded and Black's pieces cannot protect each other and at the same time stop the advancing d-pawn. 33...Ng5= now Black's pieces are no longer overloaded and the position is equal. 34.h4 Rf3+ I thought for some time here and concluded that Black should get a perpetual check out of this sequence. 35.Kg2 Rxf4 36.hxg5 Rf5 now the king would not be close enough to the rook to be able to fend off the checks by counterattacking. 37.Re7? White desperately wants to win, so plays riskily to prevent the perpetual. 37.d6 would lead to the perpetual check scenario, as Black would have no alternative that could prevent the pawn from queening. Rxg5+ 37...Rxe7 38.Rxe7 Rxg5+ 39.Kf3 Rxd5 40.Rxa7 This was the position we both had seen on move 37, although I'd evaluate it as at least a sure draw for Black, with winning chances. If White's pawns were further advanced, perhaps it would be another story. h5 41.a4 White was getting a bit short on time here and evidently didn't do a CCT check. 41.Ke3 41...Rd3+-+ the b-pawn is now doomed. 42.Ke2 Rb3 43.a5 attempting to run for glory. With the rook in front of it rather than behind it, though, the pawn can never reach the 8th rank alive. Rxb2+ 44.Kf3 Ra2 Black now has a completely won endgame. 45.Kf4 Kg7 46.Kg5 White's last-gasp attempt to stop the Black pawns. Ra4 The rook closes off the king's escape and looms ready for the mate. Timmmmm resigns 46...Ra4 47.Rxf7+ Kxf7 48.Kh6 Rxa5 49.Kh7 h4 50.Kh6 Rh5# 0–1
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