The advantage of being the stronger player

Over the weekend Wellington participated in a match against a combined team from Wanganui and Palmeston North. After suffering a previous defeat at the hands of Wanganui when we tried to match their line-up and make the match an even content in the interests of good relations this time we decided to field the strongest team we could muster. The combined team obviously took the event seriously as well fielding the strongest lineup they could. In the end the final result of 16.5 - 1.5 probably exagerated the difference in the teams a little but the games seemed to highlight the advantages of being the stronger player in these sorts of situations.

Justin Davis - Nicolas Croad

Match Wellington vs Wanginui and Palmeston North 2008

1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.a3 Bb7 5.Nc3 d5 6.cxd5 Nxd5 7.Bg5?!

This move must be criticised and blamed for giving away any opening advantage available to the White player. Justin probably decided he would have more chance of keeping pace with me in a simplified position with fewer pieces on the board but on positional grounds White has a slight space advantage and exchanging the dark squared bishops affords the Black queen a nice development square on e7.

Some people would probably argue that because White can be somewhat more satisfied with a drawn result he can use this to his advantage by simplifying the game and trying to force Black to take risks to avoid a draw but I do not really agree. As this game shows even in a simplified situation there are often plenty of mistakes to be made and if I am actually stronger than my opponent then I should expect I will exploit my chances better. In other words by playing inferior moves for the purpose of exchanging pieces White is gradually heading towards a situation where I can put pressure on him not one where he will pressure me.

7...Nxc3

I decided to close the c-file before challenging the bishop. After this exchange there is no way for a rook to pressure me along that file so I should have no trouble executing c7-c5.

8.bxc3

If 8.Bxd8 Nxd1 9.Bxc7 Nxb2 White loses a piece.

8...Be7 9.Bxe7 Qxe7 10.e3

Interesting was 10.Qa4+ when 10...Nd7?! 11.Ne5 blocks Black's development. After the better 10...c6 11.Ne5 O-O 12.e3 c5 White experiences some difficulty with the development of his light squared bishop and must take care because Black might be able to quickly open the centre with the White king still uncastled.

10...O-O 11.Be2 Nd7?!

This move must be criticised because this knight later re-develops with Nd7-b8-c6-a5. The same situation as the game could have been achieved with 11...c5 12.O-O Rd8 to be followed by Nb8-c6-a5 and most likely ...Rac8. At the time I had not yet decided where to place the pieces and only later decided that my knight should go to a5. This might have given Black an extra opportunity if White loses temporary control of the d5 square then Black might play ...e5 at an appropriate moment and then break up the White pawn structure. This is the type of decision that you only make easily when you know the opening well and have seen a similar situation before.

12.O-O c5 13.Qd2 Rfd8 14.Rfd1 Rac8 15.Qb2 Nb8!

Both sides have completed their development and now I needed to find a plan. It is still relatively difficult for White to improve his position so I felt that I was better placed but there are no obvious weaknesses in the White camp. Maybe another reasonable square for the knight was on e4 after 15...Nf6 but it seems that the reply 16.Ne5 with the intention of exchanging the light squared bishops was quite strong here.

16.Rac1

Maybe 16.Nd2 Nc6 17.Bf3 trying to exchange black's best minor piece was a little better.

16...Nc6 17.e4 Na5

A rare case of the knight being well placed on the edge of the board. While it never occupies the c4 square during the game this may become possible at some point. It stops White playing a4-a5 and breaking up the Black queenside and this combination allows Black to develop the remainder of his position while the knight stops much of White's counterplay. In lots of variations it also helps by guarding the bishop on b7.

18.Nd2

18...cxd4?!

There were still some useful moves for Black to play before carrying on with the decisive offensive. After 18...h6 19.f3 Qg5! 20.Nf1 cxd4 21.cxd4 Rxc1 22.Rxc1 Rxd4 wins a pawn and shows how difficult to hold together the White position has become. Notice if the knight was not guarding the bishop on b7 now 23.Rc7 would win material here.

19.cxd4 Qd7

Instead 19...Qd6 20.e5 Qxd4? 21.Rxc8 Bxc8 22.Nf1 Qxd1 23.Bxd1 Rxd1 24.Qc2! Rd8 25.Qc7 Rf8 26.Qxa7 White is clearly winning now.

20.Rxc8 Rxc8 21.f3!

An excellent move which shuts down the long diagonal to the extent that Black's light squared bishop becomes cramped for space.

21...Qc7

This was part of my plan when I played 18...cxd4 I control the c-file and that can not be challenged. It turns out however that even though I can stop the passed pawn that White creates in the centre White gains enough counterplay with it to hold the balance.

22.Nb3 Nxb3 23.Qxb3 Qc3

I am quite pleased with this move because before playing it I realised that I really had no advantage in the ensuing complications. Despite this realisation I didn't over-react and end up in a difficult position. There are no better moves available at this point anyway. Instead I also considered 23...Qc2 24.Qxc2 Rxc2 25.Bd3 Rc3 26.d5 with the same result as the game though the bishop is better placed on d3 than e2. Black can't capture the pawn now with 26...exd5 27.exd5 Bxd5? because of 28.Be4 and the bishop is pinned by a back rank mate along the d-file.
I also considered 23...Kf8 but Black has gained nothing after 24.Qb4+ Qe7 25.Qb3 anyway and further pushing in this direction will only make Black's position more difficult.

24.Qxc3 Rxc3 25.d5! exd5 26.exd5 Kf8 27.d6 Ke8 28.Bb5+ Bc6

Forced by the variation 28...Kd8 29.Re1 with the threat of Re8#

29.Re1+?

The decisive mistake allowing me to create two connected passed pawns on the queenside. Instead White needed to more accurately exploit the same idea with 29.Bxc6+ Rxc6 30.Re1+ Kd7 31.Re7+ Kxd6 32.Rxa7 Rc7 with an endgame which offers no advantage and very few winning or losing chances to either side.

29...Kd7 30.Bxc6+ Kxc6!

Instead 30...Rxc6? 31.Re7+ Kxd6 32.Rxa7 Rc7 leads to the same position as White should have forced in the note above.

31.Re7 Rxa3

White was threatening Rc7+ anyway. Now the two protected passed pawns on the queenside are more dangerous than their White counterparts on the kingside.

32.Rxf7 b5 33.d7

The variation 33.Rxg7 b4 34.Rg4 (34.Rxh7 b3 35.d7 this is the most inconvenient moment White can arrange (35.Rh4 b2 36.Rb4 Ra1+ 37.Kf2 b1=Q 38.Rxb1 Rxb1 -+ is the sort of position a player might avoid because of the three white passed pawns against a rook. Converting this will not present a particular challenge because Black has a passed pawn of his own which rather forces White's hand 39.h4 Kxd6 40.h5 Ke6 41.g4 Kf6 42.f4 and since the pawns can't allow themselves to be blockaded this is as far as they are going to go.) 35...Ra1+ 36.Kf2 Rd1 37.d8=Q Rxd8 38.Rxa7 b2 transposes into a position where White can no-longer stop the Black pawns promotion.) 34...a5! 35.Rd4 Kd7 36.f4 b3 37.Rd1 b2 shows which passed pawns are the most dangerous.

There are no alternative defences now anyway.

33...Rd3!

After 33...Kc7 34.d8=Q+ Kxd8 35.Rxg7 b4 36.Rxh7 b3 (or 36...Kc8 37.Rh4 a5 38.Rh5 b3 39.Rb5 a4 40.h4 with the active rook going to White again.) 37.Rb7 a5 38.h4 the win comes into doubt. The difference between these positions and the game is which side has the active rook. Actually this pawn race has some nice tactical twists to it. After 38...Ke8 39.h5 Kf8 40.h6 Kg8 41.g4 a4 42.g5 b2! 43.Rxb2 (43.g6 Rb3! -+) 43...Rxf3 = the game should be drawn. The game can also end with a draw after 41.f4 Ra1+ 42.Kf2 (42.Kh2 Rf1 43.Kg3 a4 = with ...Rh1 to follow) 42...Ra2+ 43.Kf3 b2 44.f5 Ra3+ 45.Kf2 (45.Kf4? Ra4+ 46.Kg5 Rb4 -+) 45...Ra2 = and Black must take the repetition because of 46.Kf3 a4? 47.f6 Ra3+ 48.Kf2 Rb3 49.f7+ Kf8 50.h7! when White wins.

34.d8=Q Rxd8 35.Rxa7 b4 36.Kf1 b3 37.Ra3 Rb8 38.Ra1 Kc5 39.Ke2 Kc4 40.Rc1+ Kb4 41.Kd2 Rd8+ 42.Ke2 b2 43.Rc7 Rb8

There are no longer any moves which stop the b-pawn from becoming a queen.

0-1

Lessons from this game,

a) The most important factor in rook endgames is which side has the active rook. Here I made the right decision easily and quickly with 33...Rd3! because I was well aware of this principal.

b) The stronger player should not avoid their weaker opponent trying to simplify the game, especially if they are making your game easier or better while doing this. Instead concentrate on taking advantage of the chances that your opponent provides.

c) If the game reaches a position where it is difficult for your opponent to progress look for little ways to improve your position before making any radical changes to the character of play. When you do eventually go back to forcing the game again these little advantages accumulated over the course of this developing period should pay off.

d) Don't follow the rules too rigourously. You should not be afraid to undevelop your pieces and subsequently put your knight on the side of the board just because it goes against several rules. In this game my intuition told me that the knight would be well placed there even though at the time it was not entirely clear why. I only came up with the justification of blocking White's plan while I was preparing these notes.

Winning with the Caro-Kann

Mark Van der Hoorn - Nicolas Croad
Summer Cup, Wellington 2008

1.e4 c6

Some people think the Caro-Kann is a drawing opening however their judgement is often based on elite level chess which is quite different from games between non-master players. I think that the Caro-Kann is excellent for use against lower rated opposition (who might be trying to dull the game down) because there are no symmetric pawn structures and there are several different ways to play the opening. Mark also plays the Caro-Kann so he was also facing the challenge of creating pressure against his own defence though he would typically choose the Larsen variation 4...Nf6 5.Nxf6+ gxf6 if he was black.

2.d4 d5 3.Nc3 dxe4 4.Nxe4 Bf5 5.Ng3 Bg6 6.h4 h6 7.Nf3 Nd7 8.Bd3 Bxd3 9.Qxd3 e6
10.Bf4 Qa5+ 11.Qd2!?

The most obvious choice was to transpose into the old main-line of the Capablanca variation with 11.Bd2 Qc7. This has been considered less dangerous than the similar position with white having a pawn on h5 instead of h4, however it has the slight advantage that now it would be extremely dangerous for Black to castle kingside because white will almost certainly be able to play Ng5 whenever he pleases with the pawn on h4.

After the game we also discussed the possibility to play 11.Kf1 (or even 11.Ke2) with the idea of artificially securing the king with Kg1 and keeping an attacking rook on the h-file. Still this plan looks rather too artificial to cause Black serious problems.

11...Bb4!?

Maybe the most simple reply was 11...Qxd2+ 12.Kxd2 Ngf6 and the position is completely level as neither position has any significant weaknesses or clear plans. I was trying to discourage Mark from castling queenside and I didn't feel that the position could be too bad as otherwise 11.c3 would be a strong reply to 10...Qa5+ forcing a similar situation.

12.c3 Be7 13.b4 Qa6 14.Qe2

This move is not very incisive, it was possible to put significant pressure on the Black position with 14.Nh5! Ndf6! 15.Nxg7+ (15.Ng3 Nd5 16.Nh5 Ndf6! =) 15...Kf8 16.Nxe6+ fxe6 17.Ne5 Rh7 18.Rh3 which can only be judged as unclear, because it is almost impossible to see how Black is going to break free or White is going to develop the initiative.

After the game we also looked at 14.Ne2 Ngf6 15.O-O O-O 16.Ng3 when I believe Black has equalised but no more and there is still a game to play.

14...Qxe2+ 15.Kxe2 Ngf6 16.Kd3?!

This move is a little naive as centralising the king turns out to be not very appropriate. Eventually the White king comes under fire and after Black's reply a White rook becomes occupied with a very menial defensive task.

16...Ng4!

17.Rhf1?!

It was probably better to correct the earlier error and play 17.Ke2.

17...O-O 18.Ne4 Rfd8 19.Bc7 f5!? 20.Nc5?

This loses a pawn which Mark simply missed. Much better is 20.Ned2 when the position remains roughly level though Black can take the initiative. An interesting follow up is 20...e5 21.Bxd8 e4+ 22.Kc2 (22.Nxe4 fxe4+ 23.Kxe4 Rxd8 is excellent for Black.) 22...Rxd8 and Black has excellent compensation for the exchange. This might be refuted by 22.Ke2! Rxd8 23.Ng1 Bxh4 24.g3 when Black has a pawn for the exchange but no immediate threats.

Better though less incisive is 20...Rc8 21.Bf4 (21.Bg3 g5!) 21...a5 and now if 22.a3 axb4 23.axb4 Nxf2+ wins a pawn so Black has achieved a reasonable amount of play to compensate for the slight weakness of the e6 pawn.

20...Nxc5+ 21.bxc5 Rd7 22.Bg3 Bxc5 23.Rae1 Kf7

It would be possible to criticise this move which sets up a potential knight fork on the e5 square
however this would be completely unreasonable. There is no danger of this tactic succeeding because there is no way to simultaniously oust the knight from g4 and setup the threat. In the absence of this tactic Black should use the piece with the least potential (the king not the rook) to defend the weakness on e6.

24.Nd2 b5!

Stopping the white knight from reaching c4 and creating an excellent post for my own knight on d5.

25.Nb3 Bb6 26.f3 Nf6 27.Re5

After the game Mark pointed out the tactical shot 27...Bc7 which may have won the exchange. During the game I relied on his calculation and assumed that he had not left such a tactic on (I was surprised by his next move because of this) but I believe that my judgement was correct in any case. After 27...Bc7 28.Nc5! White may end up with an exchange less but the remaining minor piece configuration makes the conversion process significantly more difficult. Actually since I must exchange my bishop for the knight once the White knight goes to the c5 square I didn't want a rook occupying that square either which explains my next move.

27...Nd5 28.Re2?!

Since winning the exchange doesn't make my task easier White should have used this to advantage and followed up with 28.Rfe1 Re8 when the rook is not quite so well placed as the game.

28...Rc8 29.c4

This leads to further exposure to the White king however otherwise ...c5 is expremely strong.

29...bxc4+?!

During the game I also considered 29...c5! 30.cxd5 c4+ when Black has excellent winning chances but I could not bring myself to sacrifice in such a nice position. Had I been more aware of the principal of two weaknesses I might have decided my chances were not so great in the game and that the sacrifice was entirely justified. Here for example 31.Kd2 Rxd5 32.Nc1 b4! the White pieces are so tied up it is clear that Black has compensation for the sacrificed material.

Once you realise that Black is not going to capture the d4 pawn because it is actually blocking the White pieces at the moment the strength of the Black position becomes clear. White can't do anything to stop Black playing a7-a5-a4 and preparing a breakthrough for the two queenside passed pawns. For example 33.Be1 a5 34.Kc2 Bxd4 or 33.Re5 a5 34.Rxd5 exd5 35.Re1 a4 and I can't see how White is going to deal with the passed pawns.

I can justify however that my choice was quite practical however. For example only examining this after the game did I realise that Black should not seek to capture the d4 pawn on move 32 because this opens lines for the White bishop allowing it to come to the queenside to deal with the pawn storm on that side.

30.Kxc4 Rb7 31.Rfe1?!

31.Bd6 stops the immediate ...c5 break and makes it much more difficult for Black to advance. Probably I can't break through with only one weakness to the White position (on d4) and a second one must be found or created. Still even now I can't really find a dangerous plan for Black to follow up with.

31...c5 32.Rxe6

I had not really considered Marks last move which stretches a difficult position too thin. In these situations something usually turns up.

Better was 32.dxc5 Bxc5 33.Nxc5 Rb4+ 34.Kd3 Rxc5 but Black is a clear pawn ahead here, the e6 pawn is immune 35.Rxe6 Rc3+ 36.Kd2 Rd4+ 37.Ke2 Kxe6 wins, while 35.Bd6 gets mated after 35...Rc3+ 36.Kd2 Rd4#.

32...Ne3+!

With the rooks split I can win the exchange on e6 at any time.

33.Kd3

If 33.R6xe3 cxd4+ 34.Kd3 dxe3 wins a whole exchange.

33...c4+ 34.Kd2

After 34.Kxe3 cxb3 35.Kd3 b2 36.R6e2 Bxd4 37.Kxd4 b1=Q 38.Rxb1 Rxb1 White only loses the exchange but winning here should not present significant problems.

34...cxb3 35.R1xe3 bxa2

Significant further material loss can not be avoided so Mark resigned.

0-1

Lessons from this game
a) The principal of two weaknesses is a significant component in the selection of a winning plan. Here I felt that my position was near to winning before playing 29...bxc4+ but I didn't use this principal to decide on a winning plan following my chosen move and this lead to an over-estimation of my position and the selection of an inferior move.
b) It is preferable not to defend against ghosts. I was able to make a good defensive move 23...Kf7 not restricting the mobility of one of my rooks because I was being concrete about the threat of a knight fork on e5. This paid off in the game because my rook was never forced to defend the weakness on e6.
c) Sometimes a pawn should not be captured when it is blocking the lines for the opponents pieces and/or forces them to defend it. In the line beginning 29...c5 this principal turns a marginal sacrifice of a piece for three pawns into a powerfull one of a piece for two pawns.

Anonymous comments enabled

I was just looking through the list of settings for the blog and I came across the settings which allow anonymous comments. I noticed I have virtually no comments or feedback and I was wondering if this was because there were no readers, no interest or because of the clearly flawless analysis I have been posting. I anyone has tried and failed to leave their comments anonymously this should now be possible. I would appreciate some feedback if anyone has any to give.

Trying to learn from your games...

Recently I participated in the 115th New Zealand Championship. To cut a long story short I was not very happy with my performance in the event (it was a disaster 4.5/11) and I want to examine all my games from this event. I also noticed that I have not been doing a particularly good job of creating instructive annotations in the Blog so far. Up to this point I would consider it a collection of interesting games with brief notes. I intend to improve this in the future starting with this game from round 1 of the latest club tournament.

Martin Hill - Nicolas Croad
Summer Cup, Wellington 2008

1.f4 c5 2.Nf3 g6 3.e4 Bg7 4.Nc3 Nc6 5.g3 d6 6.Bg2 e6 7.O-O Nge7 8.d3 O-O 9.Be3 Nd4 10.Qd2 Rb8 11.Nd1 b6!?

Up till this point we have been following the main-line of the Closed Sicilian. I was happy with this transposition from the Birds opening as I know this opening reasonably well and considered it gives Black good prospects to play for a win without taking considerable risk. My last move however perhapse requires some comment. I did spend some minutes trying to find a less passive looking alternative. The move itself is prompted by the variation 11...b5 12.c3 Nxf3+ 13.Bxf3 b4 14.c4 and here I thought Black lacks counterplay having closed the queenside while the d6-d5 break is made difficult by the poorly defended c5 pawn. Now if White plays 11.c3 then after 11...Nxf3+ 12.Bxf3 d5 13.e5 d4 Black is certainly no worse. This was my plan however since Black could also play 12...f5 here with some pressure on the White centre it may be that 11...b5 12.c3 Nxf3+ 13.Bxf3 f5 was a quite reasonable alternative though here I would still prefer to have the pawn back on b6. I certainly feel that with White playing moves such as 11.Nd1 b6 can't be a poor move despite it's relative lack of speed.

12.h3?

Martin goes wrong immediately. Maybe he was trying to follow up using ideas with which he was familiar but 12.g4 is possible immediately, so why not get on with it. Black will respond with 12...f5 to be followed by Bb7, Qd7 and Rbe8 as necessary putting more pressure on the White centre.

Another decent alternative would have been to play along the lines of 12.Ne1 Bb7 13.c3 Nc6 14.d4 cxd4 15.cxd4 d5 16.e5 when Black is equal but probably no better.

12...f5 13.Nh2 e5 14.c3 Ne6 15.Nf2

15...d5?

I was trying for too much from the position and ended up throwing away most of the advantage. Instead 15...exf4 16.Bxf4 Nxf4 17.Qxf4 fxe4 18.Qxe4 d5 gives Black a slight advantage because of the Bishop pair.

The best move however was 15...Bb7 after which the White centre is close to collapsing while Black has nothing to stop him adding more pressure with ...Qd7 and ...Rbe8 as necessary. For example 16.fxe5 Bxe5 leaves White with problems over his g3 pawn because 17.g4 f4 wins a piece for Black while 17.Nf3 Bxg3 18.Nh1 fxe4 19.dxe4 Bf4 leaves White with more weaknesses than Black's d6 pawn can compensate for. Meanwhile after 16.Nf3 exf4 17.gxf4 Qd7 black piles on the pressure and it is not clear how White is going to resist.

This is an excellent example of why it is a good idea to include all your pieces in an attack whenever possible.

16.fxe5 Bxe5 17.Bh6 Rf7

The exchange sacrifice 17...Bxg3 18.Bxf8 Nxf8 provides Black with quite a lot of compensation for a minimal material investment but can hardly be justified from a practical viewpoint.

18.g4! f4

Also quite reasonable was 18...dxe4 19.dxe4 Qxd2 20.Bxd2 f4 with a nice endgame for Black however with only an advantage on the board it is probably better to keep as many pieces as possible on the board for the moment.

I was not entirely happy about the move 18...f4 because though it does gain a strong pawn on f4 it also shuts down most of my play but it does have one major advantage. White is forced to undertake something here or simply be left with a bishop shut out of play at h6. Another alternative was 18...fxe4 19.dxe4 Bf4 20.Bxf4 Nxf4 21.Bh1 but here I thought Black has no tangible advantages and so it is not clear what to play for.

A friend has pointed out to me that activity counts for something and that is exactly what Black

has here, a whole pile of activity. He took this last variation a little further and discovered that my intuition was right. I should have been suspicious of the move f4. It just didn't feel like my advantage was being increased by it. His variations 18...fxe4 19.dxe4 Bf4 20.Bxf4 Nxf4 21.Bh1 Ba6! 22.Re1 dxe4 23.Qxd8+ Rxd8 24.Bxe4 Rd2 25.Rb1 Ne2+ 26.Kg2 Rxf2+ 27.Kxf2 Nxc3+ and Black comes out a pawn ahead. The alternative 22.Rd1 Ne2+ 23.Kg2 Qc7! 24.Nf1 Rbf8 seems to be winning as well.

I was in fact looking at the start of this variation during the game but didn't look further than the move 21.Bh1 which is not nearly far enough to decide between this and the game move. Of course with this new information in mind it is possible to improve the defence for White as well.

Instead of 21.Bh1 White should play the bettern 21.Bf3 when the bishop covers the knight check on e2 so 21...Ba6 22.Rfd1. The white pieces are still precariously placed but I don't see a way to increase the activity ratio of the Black to White pieces so it looks like White will consolidate eventually.

19.Nf3 Bc7 20.d4!

Definitely not 20.Ng5 Nxg5 21.Bxg5 f3 22.Bh1 Qd6 and the weakness of the White king position rears it's ugly head suddenly. If White does nothing however Black will play d4 with the simple follow up Nc6 and g5 so White must act sharply.

20...cxd4 21.cxd4 dxe4 22.Nxe4 Nd5

23.Nfg5 Nxg5 24.Bxg5

24.Nxg5 Re7 25.Ne4 Qd7 was an equally decent alternative. It is clear that the knight sitting on d5 and the threats produced by ...Ne3 will eventually provide Black with an advantage so Black will simply look to quell the White initiative waiting for that moment to arrive. It should be mentioned that I was on the verge of time-trouble here with my opponent having 40+ minutes still on his clock. I had been using my time and he had not been thinking too long to this point in the game.

24...Qd7 25.Rae1?!

White needs to increase or maintain the initiative to stay in the game at the moment and this move doesn't create any more threats but allows Black to complete his development. Better was 25.Nc3 Ne3 26.d5! Bb7! 27.Be4 and the game remains highly unclear and interesting.

25...Bb7

Finally I develop the light squared bishop. Note that 25...Ne3 26.Nf6+ Rxf6 27.Bxf6 Nxf1 is not a very good exchange as I lose my blockader on d5. I noticed here that there was virtually no danger of White setting up a fork (with Nf6+) because in order to oust my knight on d5 he must first move his own from e4.

26.Rf2 Kg7 27.Bh4 Ne3 28.Nf6 Qe6

There are many traps around here.
28...Qd6?? 29.Bxb7 Rxb7 30.Ne8+ wins the queen.
28...Qd8?? 29.Nh5+ wins the queen.
28...Rxf6?? 29.Bxf6+ Kxf6 30.Rxe3 wins the exchange.

29.d5 Qd6 30.Qd4 Qe5 31.Qxe5 Bxe5 32.g5

32...Bd4?

Throwing away lots of the advantage. If I had more time here I might have acted more calmly and realised that the knight on e3 and weakness of the white isolated pawn are not temporary factors. Black can take some time and play 32...Rd8 when 33.Rd2 Bd6 34.Ne4 Bb4 35.Nc3 Nc4 is a good indication of how difficult the White position is.

33.Rd2?!

Much better was 33.Rxf4 Nc2+ 34.Rxd4 Nxd4 when Black has the exchange but for a pawn less than during the game. I got the impression that Martin missed by reply here.

33...Nc2+ 34.Rxd4 Nxd4 35.Bf2 Nf5 36.Be4 Nd6?

Here it was a good time to relieve the pressure by returning the exchange. 36...Rxf6 37.gxf6+ Kxf6 38.Bxf5 Kxf5 though there are basically no winning chances provided by Black's extra pawn here.

37.Bd4 Kf8 38.Bf3 Rd8 39.Bg4 Ne8 40.Be6 Re7 41.Bc3 a5 42.b4 Nc7

43.Re5?

43.bxa5 Nxd5 44.Nxd5 Bxd5 45.Bb4! is winning for White so Black is forced to play 44...Rxe6 45.Rxe6 Bxd5 46.Rf6+ Kg8 47.axb6 with a very difficult endgame, probably losing for Black.

43...Nxe6 44.dxe6 Rd3 45.Nd7+ Ke8 46.Nf6+ Kd8 47.Be1 Re3

Exchanging White's last rook leaves him with no hope of saving the game. Notice how the un-opposed light squared bishop does multiple 'defensive' chores. It stops both the White queenside passed pawns and limits the knight's choice of movement. The opposite colored bishops actually make the exchange much easier for Black to realise here.

48.Rxe3 fxe3 49.bxa5 Rxe6 50.axb6 Ke7

Of course not 50...Rxb6 51.Ba5

51.Bb4+

The move 51.Ba5 is no better because of 51...Re5 winning the pawn on g5.

51...Kf7 52.Ng4 Rxb6 53.a3 Re6 54.Nh6+ Ke8 55.Ng4 Ba6 56.Nf6+ Kd8 57.Nxh7 Rc6 58.Nf6 Rc1+ 59.Kg2 e2 60.Ba5+ Kc8 61.Nd5 Bb7

This is even more clear than the alternative 61...e1=Q 62.Bxe1 Rxe1 63.Nf4 Re5 64.h4 and White captures Black's last pawn.

62.Kf2 Bxd5 63.Kxe2 Rh1 0-1

Lessons from this game:

a) If your attack is not quite there yet and one piece is not participating then it is a good idea to find a way to introduce that piece as well. It doesn't really matter what the target of the attack is (queenside, kingside, attack on the centre). This is of course a variation on the rule, 'Include all your pieces in the attack'. Try giving Black the move 15...Bb7 and then playing through the variations which follow to see multiple examples of this being true.

b) Unless there is some way to drive them away well placed pieces constitute a significant and durable advantage. During this game I under-estimated and then over-estimated my position with the moves 32...Bd4 and 36...Nd6 because I failed to appreciate this. There was no need to rush in the first position because of these advantages and I should have acted immediately in the second because of White's increasing threats.

c) A well placed and un-challenged bishop can perform several duties at once. Here the light squared bishop acted as both defender and attacker in the endgame making it extremely easy for me to realise my exchange advantage (after 47...Re3). In this particular situation my rook was free to roam the board creating threats all over because the bishop easily handled all the defensive duties leaving the rook with none.