Tuesday, 6 February 2018
White: AndyAndyO - thematic tournament, ChessWorld.net, 2017
In my earlier post ‘All Rook Endgames are Drawn’, I gave Tarrasch's famous maxim as meaning that “even quite favourable-looking rook endgames can be difficult to win, and sometimes they can't be won at all.”
And then sometimes they can, even if they're very difficult. Take this one:
I played for this endgame from 20 moves out (with 15...Rg8 in fact), hoping to be able to hold it. Okay, at first sight it looks completely lost, doesn't it. Indeed, remove the a-pawns and the Lomonosov tablebases already declare mate in 54.
However, the two a-pawns complicate matters considerably. Not least that if White sends the king over to the h-pawn, Black may rush round in turn and win the white a-pawn. For instance, remove the a2- and h5-pawns from the diagram, place the pieces WRh5, WKg5, BRa2, and give Black the move – and Lomonosov now says “Draw”. Moreover, with the king on d6, Black can also throw in ...Rc8 to encourage the c- or d-pawn to advance, compromising White's connected pawn front.
So what can White do? Obviously he can't simply use the rook to support the pawns, since the black h-pawn then goes through. And putting the king on blockading duty is no good either, since the white rook can't force a pawn through by itself. The solution my opponent came up with was very deep, so deep that I didn't realize I was losing until he played his 52nd move.
Summarizing his plan (with the benefit of hindsight):
— Push the a-pawn to a5 (39 a5!) where it is safer in some key lines, while encouraging Black to play ...a7-a6, weakening the b6-square (which is important later);
— Triangulate with the king (42 Kd2!) so that, when White plays Ke4, the black rook is on h7 (rather than h8) and checks from that rank don't work (due to Kg6);
— Retreating the white rook one square (45 Rh3!) so that it has access to the queenside along the third rank (even though it means allowing the h-pawn to advance);
— Push the central pawns (47 c5+!), supported by the king;
— Sacrifice the d-pawn (52 d7!) to reach a winning R+2P vs. R+P endgame (as confirmed by the tablebases).
I've since gone through this entire endgame again to see if I could have improved anywhere – with a more cunning rook move perhaps, or by not playing ...a7-a6, say – and the answer seems to be “no”. White is still winning.
In which case, Black probably has to go right back to moves 10-13 and find something there. Or else on move three.
Tuesday, 12 December 2017
White: tripoduk - Chess.com, 2017
In my previous post I mentioned that I've only ever had six OTB games with the Four Knights, and “it hardly seems worthwhile studying an opening that you only face once every five years”. The point is that there's actually quite a lot of theory on the Four Knights, especially if you meet 4 Bb5 with Rubinstein's 4...Nd4. If you can't be bothered to try and remember it all, the question is what to do other than 3...Nf6.
Obviously, 3...f5 is the move I'd most like to play. Unfortunately, 4 d4! fxe4 5 Nxe5 Nf6 6 Bc4! d5 7 Nxd5! Nxd5 8 Qh5+, as in G.Breyer-Z.Von Balla, Bad Pistyan 1912, pretty much wins for White. And there aren't any significant improvements for Black which make 3...f5 acceptable.
Alternatively, 3...g6 is a popular avoidance strategy; but as IM Andrei Obodchuk says in his book on the Four Knights (New in Chess 2011), this “is employed most often by stronger players against weaker opponents”, with the aim of outplaying them in less familiar positions. Whereas my 3 Nc3 opponents tend to be of comparable strength to me – or stronger. Outplaying them from a slightly inferior position is therefore not the most likely outcome.
So, I've recently been looking at 3...Bc5!? instead. The book refutation of this move runs 4 Nxe5! Nxe5 5 d4 Bd6 6 dxe5 Bxe5 and so on.
Back in 1993, Nunn wrote that “Examination of published theory gives the impression that this line is very bad for Black, which is probably true”. Or not. GM Oleg Romanishin has been playing 3...Bc5 for years with decent results (P24, W8, D10, L6 in the database); and as Obodchuk shows in his more serious investigation of the variation, it really isn't that bad at all. Even his various suggestions for White don't seem to trouble Black much since, if nothing else, they can often be circumvented.
I tested one such in the game below. This followed D.Pedzich-O.Romanishin, Koszalin 1997, where after 12...Nf6 13 0-0 0-0 Obodchuk suggests 14 Re1 as offering White a slight advantage. That may or may not be the case, but Black doesn't have to go in for it anyway. The plan of 12...Bd7, ...Bc6, ...0-0-0, and ...Nf6, as in B.Bogoevski-R.Navarro Segura, Merida 2001, seemed preferable to me.
As it happens, I've since had the chance to test 3...Bc5!? out over the board as well. J.Willow-J.Tait, Notts County Championship 2017, saw 7 Bc4 Nf6 8 0-0 0-0 9 Re1 Re8 10 Bg5 c6 11 f4?? Bxc3 12 bxc3 Qb6+ and Black won a pawn for nothing.
Okay, I didn't in the end manage to win either game, but at least I enjoyed them a whole lot more.
Tuesday, 31 October 2017
White: J. De Waard - North Sea Team Championship, 1998
One of my mates once told me: “if you want to play the Four Knights as Black, play the Petroff”. That's because, as I mentioned here, 3 Nc3 is a common reply to 2...Nf6. Whereas it isn't so much against 2...Nc6. Checking my own OTB games, going back to 1989, I see I've only faced 3 Nc3 six times. In correspondence chess, it's even more of a rarity: just three games in all competitions. Those nine in total continued with 4 d4 (four times), 4 g3 (thrice), and 4 Bb5 (twice). I won just once.
Hmmm. It hardly seems worthwhile studying an opening that you only face once every five years. But still... only one win as Black. How'd you like them apples?! Not very much, in truth. Maybe I should do something about that.
On the other hand, my one win was quite nice. Glek's variation (4 g3) led eventually to a double rook endgame where I held the initiative, and thence to a single rook endgame. The final result turned, after 45...Rb1, on two move 49 positions, both of which I assessed as won for Black:
a) 46 Ra2 Rxb3 47 Ra6+ Ke7 48 Rxh6 Rxd3 49 Kxf5 Rd4;
b) 46 Re2 Rxb3 47 Re5 Rxd3 48 Rxf5+ Ke6 49 Rxc5 Rxh3.
Black ends up with rook and two vs. rook and one in each case. And the second line (with split passed pawns) is indeed won, as the Lomonosov databases now confirm. But the first one (with connected passed pawns) isn't: 50 Ke5 Rxc4 51 Rb6 or 50...Kd7 51 h4 Rxc4 52 Kd5 and draws (Lomonosov again).
Guess it was lucky my opponent went for line ‘b’.
Sunday, 22 October 2017
White: A. Richards - BCCA DJKO 33/1, 1998
The main point of Georgi Popov's 3...a5!? defence to the Ruy Lopez is to follow up with 4...Na7 5 Bc4 b5, gaining the usual queenside space for Black while driving the Lopez bishop away – and trapping it should it drop back to b3. White's 4 d3 in the game below is therefore quite obliging as it blocks a retreat to the centre. Thus 4...Na7 5 Bc4 b5 (etc) and the bishop is lost.
My opponent in the game below wasn't bothered by that, responding 6 Bxf7+ Kxf7 7 Nxe5+ Ke7 and then 8 Nf7!?.
I don't recall ever seeing a similar idea before: White gives up two pieces on f7 in order to win an unprotected rook on a8 with queen checks. Later on he surprised me again by putting his other bishop en prise to a pawn (21 Bd6).
Going over the game with Houdini now, it seems neither of these surprises is particularly good for White. The engine prefers the bishop and knight to White's rook and two pawns in the first instance. In the second, it suggests that Black simply takes the piece: 21...cxd6 22 Nxd6 Nf4 and then answer 23 Nxc8 with 23...Nxg2!, which looks very strong. Whether I actually considered that, I'm unable to tell, since the game is somehow missing from my cardboard Postal Games 1996-98 folder.
What I do remember is feeling unsettled, unable wholly to trust my assessments throughout the game. In the end, I went completely wrong (31...Ng7?) and lost.
It might be assumed that emotions don't much matter in correspondence chess. On receiving a shock, for instance, you don't have to find a reply right there with the clock ticking. You can let your feelings subside before studying a position... calmly, rationally... two or three days later maybe. But it can be difficult all the same. An underlying sense of unease, that you're not in control, that things are going wrong, can pervade a whole game, and is no less disturbing for being long drawn out.
Or so I have found anyway. Your mileage may vary.
Friday, 29 September 2017
White: MarcShaw - Thematic tournament, ChessWorld.net, 2014
Hunts in chess are always “spectacular”, aren't they. In this one the white queen rushes out early to h5, snaffles the rook on h8, is driven back by busy minor pieces and seeks shelter on the queenside, only to suffer the indignity of perpetual attack from a lowly bishop, forcing a draw.
Okay, this hunt is not really so spectacular. The initial queen sally is a known theoretical line, and her subsequent harassment forms the basis of Black's compensation for the sacrificed exchange. All the same, it's quite a nice sequence of events: Qd1-h5-h8-h7-h4-a4-a3-a6-a4-a6 and draws.
It also shows that, in the 3 Bc4 variation at least, The Latvian Gambit Lives!, even if Black's path to apparent safety remains quite narrow: 3...fxe4 4 Nxe5 d5! 5 Qh5+ g6 6 Nxg6 hxg6! and so on. Everything else (e.g. 3...d6?!, 4...Qg5?!, 6...Nf6?!) is just good for White.
Since the 3 Bc4 Latvian can – and in fact did – arise via the Calabrese Counter-Gambit, it's a good thing for the latter that this line of the former is acceptable for Black. Regarding which, the game below is theoretically interesting.
From the diagram, the game continued 11...Ne5 12 Nd2 exd3 13 0-0 Nf6 14 Qh4 Qd6, which I think represents best play for both sides.
Instead, GM Kosten – working in, if not exactly pre-computer days, then certainly weaker computer days – gave a few erroneous assessments which are perhaps worth noting:
a) “11...exd3! and Black is at least equal”. Here 12 0-0 is good for White; e.g. 12...dxc2 13 Bxc2 Nf8 14 Qh4 Qxh4 15 gxh4, MarcShaw-Reprimand, ChessWorld.net 2013.
b) “13 f4! looks right, followed by Nf3-g5”. This lands White in serious trouble after 13...Nf6 14 Qh4 Neg4 15 Nf3 Qd6 16 Ng5+ Ke7.
c) 13...Qf6!? 14 f4 Nc4 15 f5 gxf5 “unclear”, H.Hage-F.Van der Muysenberg, correspondence 1995. This should have been met by 16 Nf3! with advantage.
At the time I was a bit worried about 15 Qf4, but now Houdini shows that 15...g5! 16 Qxg5 Rh8 17 Re1 Rh5 is fine for Black. I love computers :)
Wednesday, 6 September 2017
Black: juliangon - thematic tournament, ChessWorld.net, 2017
I'm currently competing in a Latvian Gambit tournament, all the games to start with 1 e4 e5 2 Nf3 f5. I've played the Latvian on and off over the board with reasonable results, and still bring it out in blitz chess from time to time. However, apart from 3 Bc4 which can arise via the Calabrese Counter-Gambit (1 e4 e5 2 Bc4 f5 3 Nf3), I've not looked at the theory in years, especially the state of the 3 Nxe5 Qf6 4 d4 d6 5 Nc4 fxe4 main line.
Well, I have to say that this seems now to be virtually unplayable for Black, so that anyone who manages to scramble a draw from this position has, I think, done very well. So far I've not managed to do that and have been crushed twice. From the other side, I am (or was) looking at two solid wins as White. My third opponent might well draw as Black (well done!), while I might draw my third game too (hurrah!).
All the same, just ½/3 and having to work extremely hard for it... No, I don't think I'll bother anymore, thanks. If it's really true that The Latvian Gambit Lives, as GM Tony Kosten entitled his second book on the opening (Batsford 2001), it's only with a finger or two keeping the coffin lid from being nailed shut.
My two losses have come against 6 Nc3 Qg6 7 Ne3 and 7 f3 Be7 8 fxe4!. In the latter line, I look like drawing with each colour after 8 Nxe4. I'm a pawn up in the endgame as White, but it will probably resolve itself to three vs. two on the kingside, which won't be an easy win. Whereas two pawns up and three vs. one should be simple enough (as has occurred in another game after 3...Nf6 4 Bc4 Qe7 5 d4 Nc6 6 Nc3!).
In my final game as White, I went for Bronstein's 6 Be2, both for a change and because I've never been particularly happy facing this myself. Indeed, it all turned out very well for me, until my final move...
Here I intended 30 gxf6 Rxe5 31 fxg7 Kxg7 32 Ne4 and wins, while the tricky 31...Re1!? is refuted by 32 Bxh7+! Kxh7 33 g8Q+ Kxg8 34 Rg3+ (saving the rook) and 35 Qxe1. Instead, I apparently entered 30 Bxf6??, which is a terrible blunder since 30...Re1! now works and even wins for Black; i.e. 31 Qxe1 Qxf3+ 32 Kh2 Qxh3+ 33 Kg1 c4+ etc. As I wrote in an earlier post: “human stupidity can never be prevented entirely”.
Fortunately, I only discovered my mistake when glancing over an email notifying me that my opponent had resigned, which of course was a terrible blunder too.
Naturally, I was both surprised (at my mistake) and pleased (that it hadn't immediately cost me the game), if more surprised than pleased. In fact “shocked” and “relieved” would be more to the point there. But at least it was first thing in the morning rather than last thing at night. Otherwise I might have been tossing and turning for hours.
Thursday, 31 August 2017
Black: D. Nightingale - John Elburg anniversary tournament, 2001
“Petroff's Defence, or the Russian Game, is an extremely peace-loving opening. By choosing a symmetrical move, Black is as much as saying: whatever you do, I'll follow you; I'm a meek and mild-tempered fellow.
“If White responds to Black's peace initiative, then the moves flow like water off a duck's back – a dozen exchanges, and the clocks are stopped. Draw.
“But White has only to show a touch of arrogance and obstinacy, and go in for an open fight, when Black immediately replies blow for blow, and then for a long time it is difficult to say who is attacking and who is defending.
“But that rarely happens. More often White complies; one exchange, then another – and then the judge rushes to the table....”
Such was Bronstein's witty description of the Petroff back in 1970. Nowadays, even if the draw percentage remains high, White is generally unwilling to concede one quite so easily. Thus Black is obliged to demonstrate the opening's fighting qualities, as in the game below.
This followed a then topical variation with 3 d4 and 7...Qh4, which seems now to be a theoretical backwater, almost a historical footnote. White prefers 3 Nxe5 five or sixfold over 3 d4 – and 3 Nc3 too is seen nearly three times as often. Even when 3 d4 is brought out, subsequent play hardly ever gets as far as 7...Qh4, which features in just 0.002% of recent Petroff games.
Nevertheless, an “open fight” duly ensued, with both sides pushing their pawns forward vigorously, and a wholly correct exchange sacrifice led to a material imbalance of rook vs. bishop and pawn.
In this position Black's bishop (hiding behind the white d-pawn) safeguards his king, and the advancing kingside pawns should give him sufficient compensation, whether or not queens come off. In the end, all the major pieces left the board, and the g- and h-pawns were traded for White's c- and d-pawns, to leave a pure rook vs. bishop endgame with three vs. two on one flank.
As Averbakh showed many years ago, Pa5, Pb6, Bc6, Kb7 is a fortress even without the black c-pawn. So all that remained was for the metaphorical judge to rush to the table.