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Anton Filippov vs Truong Son Nguyen
Khanty-Mansiysk Olympiad (2010), Khanty-Mansiysk RUS, rd 3, Sep-23
French Defense: Steinitz. Boleslavsky Variation (C11)  ·  0-1



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Kibitzer's Corner
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Premium Chessgames Member
  Jimfromprovidence: <patzer2>. <Obviously you meant 29. Kf3? was the losing move. Instead, 29. a4 seems to be White's best chance to survive.>

Yes, thanks for the correction. I still don't get what white saw that made him play 29 Kf3; maybe ...Qe2 was it?

Nov-05-10  ConstantImprovement: First try was

I. 31. ... Nd2+

1. 32. Kg2 Qf1#

2. 32. Bd2:

a. 32. ... e5?? 33. Be1:

b. 32. ... Qe2+ 33. Kg2 Qf1+ 33. Kf3 Be2+ (33. ... e5 34. Qe3 should win) 34. Ke3 e5 must have a refutation:

The problem is that 35. de: runs into Bc5# and 35. fe: into Bg5# respectively. The threat is 35. ... ed:+ 36. Kd4: Qf2:+, regaining the piece. Any knight move runs into 35. ... Qf3#.

So perhaps 35. Qc3? Yes, should work: 35. ... e4 is harmless, 35. ... fe:+ 36. gf: is winning, as is 35. ... ed:+ 36. Qd4:.

c. 32. ... Be2+ 33. Ke3 e5 (33. ... Bc4+ 34. Be1: Bb3: 35. b3: and White is two pieces up) 34. Qc3 winning similar to b.

Result for I.: 31. ... Nd2+ does not work.

Interesting is

II. 31. ... e5, since 32. de: or fe: are answered by 32. ... Nd2+, transposing into the winning lines above.

32. Nd3? Qe3:+.

32. Qc3, the defensive move above, is not possible due to 32. ... Qc3:.

32. Qb5: e5+ (an alternative is Qe3:+ 33. Kg2 Nd2 or 32. ... Qd4:, probably winning) 33. Be5: (33. Kg4? h5+ 34. Kh3 Qf1#) e5:+ 34. Ne5: Qe3:+ 35. Kg2 Qe2+ 36. Kg1 (only move: 36. Nf2 Ne3+, winning the queen)should be winning.

Result for II.: Not so clear, but nearly winning.

III. 31. ... Ne5+ (achieves all the advantages of e5, but with tempo)

1. 32. Kg2 Qf1#

2. 32. de: Be2+ 33. Kg2 Qf1#

3. 32. fe: Be2+ 33. Kf4 g5#

Conclusion: While a combination was very likely due to the proximity of the Queen to the King, the weakness of the e2-square, the weakness of the e3-Bishop and the loosened pawn cover around the King, 31. ... Nd2+ was an illusion, 31. ... e5 a slower and more difficult way to victory and 31. ... Ne5+ the only swift and clear end.

Nov-05-10  solskytz: (to Jim) I think that Once's explanation, about White being inspired by Blacks' Kg7 in preparing for the endgame, in the best spirit of Capablanca and Alekhine (but somewhat misplaced here), does it.

Incidentally, and should I mention it, Once's posts are the main reason for my return to the site over the last couple of weeks. I had a pleasant surprise in discovering his many and varied posts.

It seemed like a certain evolutionary phase - first there were the splendid 'unplugged' series, then there was a certain period of hibernation, without that many of his post... and now that I'm back on the site, these stories and reflections - simply amazing.

Nov-05-10  wals: Had Nc4 as the piece to move but as usual moved it to the wrong square.

Regurgitation is good, ant larvae, chicks etc., thrive on it, and so do I.

Rybka 4 x 64

depth 23 : 55 min :
White blunder
(-0.97):27.Qb3. Best, Nxf6, =-0.12,
a4, =-0.30.

depth 21 : 8 min :
White blunder
(-5.73):29.Kf3. Best, Bc1, -0.97.
a4, -0.98.

White blunder
(-#3):31.Nf2. Qxb5 or Bd3 would have allowed White to play on for a while.

Nov-05-10  WhiteRook48: 31...Ne5+
oh wow I actually got it
Nov-05-10  M.Hassan: "Difficult" Black to move 31....?
Materials are even.
Southern California where I am to visit my son is so beautiful and the weather is so pleasant that it has been almost a week that i missed the puzzles and today, I had time to go to CG and found the Thursday puzzle and found it almost easy!!

if <32.Kg2 Qf1#>
if <32.Kg4 h4+ 33.Kh3 Qf1#> So, White is forced to take the Knight

32.Bxd2 Qe2+
33.Kg2 Qf1+
34.Kf3 Be2#

Time to check!
Actual game: 31.....Ne5+ is correct and I'm wrong. Move 34 in my line, White is not checkmate. sigh

Nov-05-10  BOSTER: Solving today puzzle I made two mistakes.
First, I played 31....Nd2+. 32.Bxd2 Be2+ 33.Kg2 Qf1# ,making a big lapse in visualization, as called by Krogius "retained image", because after 32.Bxd2 white king can move to e3. For me bishop was still on e3. Second mistake- I stop analyzing too soon before considering other checks(Ne5+). It means my evaluation is superficial, or using another words this is a poor process for move selection. Watching the real game I have to say that white blunder like 31.Nf2 is more difficult to explain.
Nov-05-10  Peter Nemenyi: <Once: I get the impression that this site has lots of lurkers who read, enjoy and learn but don't necessarily comment. I wouldn't worry too much about the occasional silence - it hides a lot of watching eyes.>

Very true, and not just about this site. Look at any message board, on any topic, that gives a count of guests and members; the ratio is typically about three to one, and rarely below two to one. Most people who use a site never take the ninety seconds to register and so can't comment.

Nov-05-10  DarthStapler: Surprisingly easy for a Friday puzzle
Nov-05-10  Patriot: <Once> Thank you for the kind words. I certainly enjoy your stories. They are humorous, adventurous, and very imaginative. I'm not sure how you write them in such short order. What's interesting is they often have storyline's of the kinds of movies I like to watch.

I may lose sleep thinking about those watching eyes, however. :-)

<<Bignevermo>: PATRIOT.... you are be sure....> Thank you! :-)

Nov-05-10  Patriot: <BOSTER> I always enjoy reading your posts because I don't know what to expect.

About your two mistakes, I think you only made one. Your first mistake was the "retained image" error and you thought there was a straight-forward mate where 33.Ke3 was not an option. Therefore there was no need to look at 31...Ne5+ so the second mistake became a non-issue. I would've made the same decision.

Nov-05-10  Fezzik: Wow! This was a move that either you saw or didn't see. If you saw it, everything falls into place.

To make sure you see such moves AAFMF: Always Analyse Forcing Moves First! Checks are the most forcing moves.

Nov-05-10  TheBish: A Filippov vs Ngoc Truongson Nguyen, 2010

Black to play (31...?) "Difficult"

The first move I looked at proved correct, so for me, it wasn't so difficult!


This leads to a mate in three or less in all lines.

A) 32. dxe5 Be2+ 33. Kg2 Qf1#.

B) 32. fxe5 Be2+ 33. Kf4 (33. Kg2 Qf1#) g5#.

C) 32. Kg2 Qf1# is even quicker.

Nov-06-10  David2009: A Filippov vs Ngoc Truongson Nguyen, 2010 postscript to postcript: Congratulations to <cocker> and <LoveThatJoker> for finding 31 ...Ba4, which does indeed win. Special congratulations to <solskytz> for refuting Crafty EGT's colours-reversed defence 31...Ba4 32 Qb7. <solskytz: In my opinion, LovethatJoker's 31...Ba4 gives black a decent advantage (of course, nothing nearly as good as 31...Ne5+, but that goes without saying) after 32. Qb7. I'm up a piece for nothing with an absolutely crushing game after 31...Ba4 32. Qb7 Qxe3+ 33. Kg2 Kf7 34. Bb3 Bxb3 35. ab Nd2.> Agreed <I actually don't understand why the endgame trainer doesn't take my loose B on a4 but rather proceeds 34. Bb3 [snip] What do you think?> After 34 Bxa4 Qe2 wins:

click for larger view

and White cannot prevent ...Ne3+ winning at least the Nf2. This is even more crushing than your move 34...a5.

When I looked at the position late last night (European time) I found Crafty EGT wouldn't respond. When I tried again this morning Crafty EGT (playing colours-reversed) had changed its mind: it now qives up Q for N+B to buy temporary safety for its King starting 31..Ba4 32 Qxc4 which is hopeless in the long run. Perhaps the algorithm depends on the free resources available at its host site and it has more resources at the time of posting. <CHESSTTCAMPS> found a similar effect earlier.

Crafty EGT link to position after 31...Ba4: Link to puzzle position colours-reversed:

Nov-06-10  solskytz: David2009 - first thank you for acknowledging my efforts :-)

Secondly - of course, you are right. 34...Qe2 is pretty cool - it's what Nimzowitsch would have called "the hit and hold tactic". Qe2 holds king and knight so that neither can run away, and then Ne3+ hits at both.

My 34...a5 does keep a pronounced edge, but isn't crushing just as yet.

This may explain why Crafty preferred 34. Bb3 to capturing on a4. Bb3 puts a question to the knight. If he can eliminate it there will never be ...Ne3+. In Crafty's mind he's already playing down a piece because he sees your variation with ...Qe2 (see footnote 1) - so he doesn't care about having dropped the Be3 earlier and doesn't grab on a4.

When I take on b3 later (34...Bxb3 35. ab), again a question is put to my knight. He can't go to e3 as the Queen still stands there...

(Footnote 1) and again, luck in chess. Did it happen to you to play a stronger opponent and not understand why he gives away a piece?

He sees that if he doesn't he gets a checkmate that you, the weaker player, never intended to give!

You can say that I 'got lucky' this way against crafty, who saw 34...Qe2 which was hidden from my eyes.

Nov-06-10  solskytz: ...and thinking again, David, what do you think about this? 31...Ba4 32. Qb7 Qxe3+ 33. Kg2 Kf7 34. Bxa4 Qe2 35. g4?

Now 35...Ne3+ Kg3, I still keep my knight. Maybe signs of equality? I don't see any more effective checks (35...Nf1+ 36. Kg2, no problem).

White's d4 and a2 are weak and falling - but black isn't threatening d4 as yet and white can take on a7, defending d4.

White's Q can go to the eighth rank, threatening Qe8+ with major chaos... e6 is in danger, something needs to done for the Be7... I'm beginning to like it for white all of a sudden...

OR - I want my 34...a5 back in this variation. Black's a pawn is defended, the Queen from e3 threatens d4. 35. Qa8 Nd6 36. Qxa5 Qxd4 probably still favors black, who has the attack, the more advanced passed pawn, which is also central and can be a deciding factor in the attack against the white king when it goes up another step or two.


Premium Chessgames Member
  Sastre: <solskytz: ...and thinking again, David, what do you think about this? 31...Ba4 32. Qb7 Qxe3+ 33. Kg2 Kf7 34. Bxa4 Qe2 35. g4?> Black is winning after 35...Ne3+ 36.Kg3 h5 37.h4 hxg4.
Nov-09-10  solskytz: The question was put to David2009, who understands and humanly talks about chess, rather than submitting a position into a computer and simply kibitzing the computer's favorite line.

In the line that you give I would deviate with 35...Ne3+ 36. Kg3 h5 37. gxh5, not 37. h4. There is still some life here for white, I assume.

That's a pretty good defensive knight there on f2, and of course white shouldn't let black have a pawn on g4, creating a killer spot for the black queen on f3.

Premium Chessgames Member
  Sastre: <In the line that you give I would deviate with 35...Ne3+ 36. Kg3 h5 37. gxh5, not 37. h4. There is still some life here for white, I assume> 37...gxh5 38.Qc8 h4+ 39.Kh3 Qf3#. My analysis wasn't computer generated.
Nov-10-10  solskytz: (to sastre) in the line you post 38. Qc8 isn't forced. My move would be 38. h4.
Premium Chessgames Member
  Sastre: What would you suggest as a better alternative to 38.Qc8?
Nov-10-10  solskytz: except that 38. h4 Ng4 looks good. It seems that white will now be forced onto 39. Nxg4 Qxg4+, after which I didn't really calculate, but the black queen can surely sweep off the h, f and probably d pawns with a well thought out series of checks.

If it can also win the a4 bishop (I didn't really calculate) then it's curtains. Otherwise there may be some defenses for white.

Nov-10-10  solskytz: Now I've got to go... we can continue the discussion later.
Premium Chessgames Member
  Sastre: <solskytz: except that 38. h4 Ng4 looks good> 38.h4 Nf5+ 39.Kg2 Nxh4+ 40.Kg1 Qe1+ 41.Kh2 Qxf2+ 42.Kh3 Qg2# wins for Black.
Jan-28-21  tibone: @sastre, @once, @sesha, @ekw: what if 31. Bd1? I think there is no clearly winning forcing line for black after 31. Bd1.

e.g. 31... a6 32. Nf2 or 31... a5 32. a4

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