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Yaniet Marrero Lopez vs Angel Perez Quinones
Capablanca Mem Mixto (2005), Havana CUB, rd 7
French Defense: Advance. Euwe Variation (C02)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 5 OF 5 ·  Later Kibitzing>
Dec-18-09  MaczynskiPratten: <KeithDow> certainly has an interesting point! This is another game where it would be interesting to see the clock times. I would guess that both 36 Qxd8 and 36...Qa1 were played almost instantly and that neither player saw 36...Qd3. In fact I'd speculate they were both in deep time trouble from about move 30 onwards because, as pointed out by <jkundzik>, 32 Qf6 seems to win instantly - unless I'm missing something else.

Luckily I looked at Black's threats as well as White's in the opening position, noted the danger of ..Qd3 and therefore was able to reject 36 Qd8. I went for Qc2 instead, to defend against Qd3 and pick up the b pawn. One wrinkle; if 36 Qc2 Bf6, White has 37 Qf2+!

Dec-18-09
Premium Chessgames Member
  Jimfromprovidence: I went with one of the lines <theaN> briefly mentioned, 36 Qxd8 Qa2, seeing Qxb1.


click for larger view

That line fails to 37 Qa8+ Kxa8 38 d8Q+ Ka7, then the killer 39 Qd4+, which double attacks the b pawn with check.


click for larger view

Now, after either 39...Kb8 or 39...b6, 40 Qxb2 (not 40 Rxb2??) wins comfortably.

Dec-18-09  WhiteRook48: I had 36 h4
Dec-18-09
Premium Chessgames Member
  chrisowen: Hiya all, bit late again I know. It looks like i'll take a crack at that punzzle.
Dec-18-09
Premium Chessgames Member
  chrisowen: Nice french advance. The black/ white kings both need oxygen. Act on gut instincts and Qxd8 should suffice. Dry the black attack after Qa1 with Qa8+ where the d4 square is then available. In fact white is compounded because black emits the resource Qd3! It is a trace of dusting off your opponent when he's beat. For Angel he's flying until Qa1 then choked out in his own haste.
Dec-18-09  TheSlid: I wanted to play 36.h3 from the diagram position, but might easily have lost anyway playing against anyone. I liked the move because it seemed that the main problem with W was being cheapoed on the back rank and that he was basically ahead on the promotion race, by virtue of the rook being able to take the offending pawn.

Gave me a laugh when I saw the great weight of intellectual effort on this one! Thanks, fellow kibbitzers.

Dec-18-09  Jack Kerouac: One of those infrequent 'sees' where I found this about 5 seconds in. Funny how some of these just jump out at you and some of the Tuesday/Wednesday puzzles are oblique as Hell.
Dec-18-09  cyclon: This is really difficult. Best I can come up with is 36.h4 Qa2 (-Qa1? 37.Qc2 Bf6 [Black Queen has no threats towards d7-pawn now her being in a1-square]38.Qxb2 wins) 37.Rxb2 Qxb2 38.Qxd8 Qc1+ 39.Kh2 Qf4+ 40.Kh3 (that`s why 36.h4, h3-square is for the King). Point in this variation is that White King might escape to the a3-square if needed, but I`m not sure whether this line is correct.
Dec-18-09  Kasputin: I agree with you <Once>, and I wasn't complaining.
Dec-18-09  A Karpov Fan: I spent an hour on this looking for the win and eventually opted for 36. Qc2

I am glad it is the strongest move (according to Fritz 12), but I still feel cheated a bit.

If I want non puzzles, I can have more fun playing games CG... :-(

Dec-18-09
Premium Chessgames Member
  beenthere240: As the game is played, I would give 37. Qa8+ an !. You can give Qxd8 a ? (since it loses) or a ?! (since it's a clever trap), but you need to reward the 37th move. And yes I fell for the trap looking for the forceful move.
Dec-18-09  goodevans: <Kasputin: ... isn't this really a non-puzzle?>

I see where you're comming from and I've made similar comments in the past about positions where there wasn't a clear best move. That said, sometimes these are the most enjoyable to analyse.

<Once: ... For my money, CG.com could give us twice as many spoilers as they do. I enjoyed today ...>

So did I. And if the kibitzing is any indication then so did a lot of others.

<A Karpov Fan: ... I still feel cheated a bit. If I want non puzzles, I can have more fun playing games CG...>

Each to his own. This cetainly isn't the least puzzle-like puzzle that CG.com has published. Hopefully you'll enjoy tomorrow's more.

Dec-18-09
Premium Chessgames Member
  Check It Out: Candidates: 36.Qxd8, 36.Rg1

-----
A: <36.Qxd8> If white can parry black's threats, he's up a rook.

<36...Qd3> seems like a good move; attacks white's rook and d pawn, and threatens back rank mate in some lines.

<37.Rg1 b1=Q 38.Qe7 Qb6> and it just doesn't seem to work.

-----
B: <36.Rg1 Qa1 37.Qc5+ b6 38.Qd4 b1=Q 39.Qxa1 Qxa1 40.Rxa1> hm, maybe. Now white can bring his rook over to the c file, drop it down to c8 and snap up the black bishop for the d pawn.

This position worked my brain hard. Let's see how it went down.

==============

Interesting. I'm happy I caught 36...Qd3!

However, I don't know if my B section actually works, so I don't know if I get credit for solving the puzzle. Time to read :)

Dec-18-09  TheBish: Y Marrero Lopez vs A Perez, 2005

White to play (36.?) "Difficult"

I smell a spoiler! After getting fooled so often, I won't get fooled again!

Tempting is 36. Qxd8?, seeing 36...Qa1(?) 37. Qa8+ Kxa8 38. d8=Q+ Ka7 39. Qd1 and wins. However, Black plays 36...Qd3! and turns the table due to White's weak bank rank. Play could go (after 36. Qxd8 Qd3) 37. h4 Qxb1+ 38. Kh2 Qd1 39. Qf6 b1=Q 40. d8=Q Qg1+ 41. Kh3 Qe3+ 42. Qf3 Qh1+ 43. Kg3 Qe5+ 44. Qf4 Qhe1+ 45. Kg4 h5+ 46. Q5e2#. How often do you get to use notation like "Q5e2"?

Best seems to be 36. Qc2! Qd6 (not 36...Bf6? 37. Qf2+, winning the bishop) 37. Rd1 Qf6, but I don't see any way to make progress, and a draw seems a likely outcome.

Dec-18-09  YouRang: Well, I pretty much found the line that was played, only to discover that the whole point of the puzzle is to show that the line played was double-defective. :-\
Dec-18-09  muralman: Is it time for me to pout? I made the same moves as the white played it without ever considering black queen to D3. White lucked out and won.

Now that I see the other poster's point, I realize my move was foolish, as was the player's.

Considering winning a chess came often is because of luck, I proudly accept this win! Black blundered.

So there.

Dec-18-09
Premium Chessgames Member
  johnlspouge: Friday (Difficult)

Y Marrero Lopez vs A Perez, 2005 (36.?)

White to play and win.

Material: R for B+2P. The Black Ka7 has 1 legal move, which Rb1 x-rays through Pb2. Both sides have passed Ps about to queen. The obvious removal is apparently unsuccessful, because the White Kh1 is vulnerable to a back-rank mate:

36.Qxd8 Qd3

and the White Qd8 is unable to support Rb1.

Candidates (36.): Qxd8

36.Qxd8 Qd3

I just could not see anything, although I knew 36…Qa1 looked much weaker for Black.

Dec-18-09  Old Wolf: This problem was lame. One sees quickly that 1.Qxd8 fails to Qd3 and that 1.Qc2 leads to an unclear position, but then we wasted half an hour trying to find a win for White.

If you didn't see Qd3 quickly then try listing all moves that threaten mate before deeply investigating the first one you see! It would have been found very quickly if that position were given as a daily problem with black to move and win.

Dec-18-09  ohfluckaduck: I like this problem, and I agree with you Old Wolf: The key is finding Qd3 quickly, and avoiding A1.
Dec-18-09  turbo231: I fell for the Qxd8 trap. I thought I had it all worked out, silly me. I didn't have a clue.
Dec-18-09  Archerforthelord: h3 avoids back rank tricks and really threatens Qxd8. I dunno if anyone already posted this but the position is in Jacob Aagaard's book "Practical Chess Defence" I highly recommend this or anything else by the man. Thanks Aagaard.
Dec-18-09  Archerforthelord: I should also mention that I rarely hear mention of Aagaard's publishings despite being of very high quality.
Dec-18-09  TheBish: <johnlspouge: Friday (Difficult)

Y Marrero Lopez vs A Perez, 2005 (36.?)

White to play and win.>

Just a reminder, John, that it's White to play, but not necessarily to win!

Dec-19-09  patzer2: For today's Friday puzzle, we have a case of one blunder (36. Qxd8??) being followed by another (36...Qa1??). Unfortunately for Black, White punishes his error with the decisive Queen sham sacrifice 37. Qa8+! (also winning is 37. Qb8+! or 37. Qb6+).

In the puzzle position (36?), instead of 36. Qxd8?? White should opt to play defense and hold on for an even position with 36. h3 = or 36. Qc2 = (my choice).

After the blunder 36. Qxd8??, Black missed the win 36...Qd3!! .

Dec-19-09
Premium Chessgames Member
  whiteshark: <36.Qc2> would have been my choice. I realised that 36.Qxd8 was losing due to 36...Qd3. 36.h3 lead to a perpetual and I didn't like 36.Qc4 as it doesn't cover the backrank, compared to Qc2. Well 5/5, a personal record.
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