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Alexander Arulaid vs Fyodor Ivanovich Dus Chotimirsky
URS-ch sf (1949), Vilnius, rd 1, May-??
Spanish Game: Morphy Defense. Mackenzie Variation (C77)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Jun-26-07  Crowaholic: <Marvol: Nice list of possible mistakes, but isn't this a bit nitpickety: 27. Qxc6 (+0.25) - should've played Qb4 (+0.32)> I mean, come'on, just 0.07 of a pawn... :(>

And at one ply more, the difference may easily reverse. I've certainly seen chess engines err by more than that.

Jun-26-07  MiCrooks: AverageJoe, you might want to let your program run a bit longer :)! Playing Nxa4 and allowing Nxg7 is unthinkable. The mistake was playing Nc5 in the first place.

And suggesting Qb4 instead of Qc6 makes no sense at all. A difference of 0.07 is meaningless. Other programs give a slight preference to Qxc6. As a human playing another human over the board, Qxc6!! is by far the superior move as it sets up the Rd7 show which your opponent may (and in this case DID) miss.

Jun-26-07
Premium Chessgames Member
  kevin86: In earlier days of basketball,a player could foul to give up one shot in exchange of a chance to score two points at the other end.A rule change ended that.(now the ball is just taken out of bounds)

This game reminds me of that strategy:white gives up one rook in exchange for forcing black's king to cut communication with the rooks and leave them undefended. Now,instead of protection,one rook is taken with a skewer on the king and other rook. Both are lost. Instead of a windfall rook-black gets rooked.

Jun-26-07  YouRang: Got it pretty quickly, as there weren't many other moves to consider, and we had to make prudent use of our rook and our e5 pawn.

Still, when you break it down, it's an amazingly resourceful combination. There are multiple tactics at work in each move, and on 2 occations we force black to interfere with himself.

After the rook "sac" <Rd7+>:

(1) This forces the bishop to occupy d7, a square that the king would love to have available in a moment. At the same time, it also causes the bishop to vacate e6, allowing <Qf6+>.

(2) This in turn forces the king to e8, where it now interferes with the mutual defense of the rooks, leaving Rh8 en prise AND setting up a skewer that wins the other rook.

As others have pointed out, black's poor development of the rooks cost him both. "Use em or lose em".

Quite understandable for black to resign 2B + pawns is no match for Q + pawns.

Jun-26-07  MostlyAverageJoe: <to everyone who had a good laugh at the: <MAJ: 27. Qxc6 (+0.25) - should've played Qb4 (+0.32)> nonsense>

AARGH. Yes, yes, I know such a difference is not relevant. My mistake in letting it slip.

After the initial analysis I did some sliding back/forward review of the analysis, to get at least 16 plies on each candidate inaccuracy, and used the resulting values. As a result I did weed out two or three other suggestions that turned out to be insignificant. I intended to take out any difference < 0.25 and just haven't noticed that this one reduced to almost nothing.

Regarding 9. ... Nxa4 instead of 9. ... Bf8 - I did not like it myself, which is why I listed 9. ... O-O as well (which is what I think should've been played at this point).

Jun-26-07  CapablancaFan: Wow a 2 for 1 sale! Give up 1 rook get 2. Sounds like a deal to me, LOL!
Jun-26-07  newton296: man this 1 was a tough one, I finally decided I had to win with tactics and not a mate . Then saw the rooks on opposite sides of the king and I could ge them both if i pushed the king back. pawn at e5 makes this easy to do but how. The rook sak at d7 works out perfect since k retreat is only move other than BxR . so black plays BxR but now white gets both rooks next move anyway with Q f6+ pushing the K back . This game was wild and reminds me of pogo blitz games. like the puzzle as it made me think!!
Jun-26-07
Premium Chessgames Member
  gawain: Saw this one quite quickly. The only delay was in verifying that there was nothing better than the actual continuation--spent a minute looking for some clever mate.
Jun-26-07
Premium Chessgames Member
  patzer2: For today's puzzle solution, the deflection sacrifice 29. Rd7! sets up a winning double attack and skewer tactic.
Jun-26-07
Premium Chessgames Member
  fm avari viraf: I think, White is far ahead in development as well as controlling the vital squares but there's lots left for improvement on the both sides. After 29.Rd7+ is all over for Black.
Jun-26-07  Hatamim: <not yet a patzer>
way to go ms. psychologist, you totally know people.
Jun-26-07  scorpiosynapse: To Kevin86: basketball fouls are additive and when team fouls exceed 6 it becomes an automatic trip to the foul line and chance to make 2 shots--stick to chess analysis and avoid the double dribble your comment about basketball engendered!
Jun-26-07  dabearsrock1010: it wasnt too difficult a puzzle but it took me about 2 minutes and i bet it was harder than most tuesdays...thats just IMO though
Jun-26-07  SpecialK: Rd7+ cleans up, no need to check (but check I will)!
Jun-26-07  vibes43: Most of us appreciate the time MAJ and others put into their detailed analyses. I have trouble posting even one sentence of analysis without making some mistake or oversight - often calling out the grid or piece. You guys are great.
Jun-26-07  Magic Castle: Would 28.....Rhd1 instead of the bishop move at least give black some more fight because of the 2 bishops and a rook for a queen?
Jun-26-07  MostlyAverageJoe: <Magic Castle> Your proposed move Rh8-d1 is not exactly feasible. Please clarify. Do you mean Rhd8?
Jun-26-07  unferth: 28 ... Rhd8 29 Qxc7+ Ke8 30 Rd6 looks grim for black, doesn't it?
Jun-26-07  MaxxLange: I think we'd need to look a lot farther back to find improvements that would really help Black, yes. He got enough material for his Queen, but that doesn't work unless it's active and coordinated, either for an attack or for a fortress defense.
Jun-27-07
Premium Chessgames Member
  kevin86: <scorpiosynapse> I feel flattered. Here you are a member for almose a month and your first comment was to me. WOW!

BTW,the old NBA rule was that for the first four fouls of a quarter on a common foul-the offended player had one opportunity. Over four (or second in the final 2 minutes) two shots were taken.

Jun-27-07  Magic Castle: <average joe> <unferth> Oops, I really mean Rhd8. The idea is to exchange rooks at the expense of a pawn and you have one rook and 2 bishops against a Queen. It looks like there are many tactical mating possibilities for black after the exchange of rooks at d7. For excample: 29. Qc7 Rd7. 30. Rd7 Bd7. Can you figure out what are black chances to go for all out mate? I do not have any engine.
Jun-27-07  unferth: <Magic Castle> 29 Qc7 Rd7 30 Rxd7 Bxd7 31 Qd6+ followed by 32 e6 will cost black at least a bishop & leave him with only R+B for Q+3P, with black's pieces loose & his king naked, I think. I don't believe black has any mating chances; looks to me like white has all the play & a fairly straightforward win.
Jun-27-07  MostlyAverageJoe: <MiCrooks: AverageJoe, you might want to let your program run a bit longer :)! Playing Nxa4 and allowing Nxg7 is unthinkable.> As already mentioned, I did not like it myself. After extended analysis, the difference is obvious:

9. ... O-O gives a reasonably even game (+0.17, 20 plies).

9. ... Nxa4 results in a more or less forced line (substantial differences between the first 2 choices at each move): 10. Nxg7+ Kf8 11. Bh6 Kg8, resulting in this position (white to move):


click for larger view

which evaluates at +2.13 after 21 plies (that's 25 plies from move 9 ...?).

What do you think is the best move above and why?

Difficulty of the above question: Sunday, Feb 29th (just a guess :-)

Jun-28-07  unferth: Ne6 followed by Qg4 looks like a killer, doesn't it?
Jun-28-07  MostlyAverageJoe: <unferth: Ne6 followed by Qg4 looks like a killer, doesn't it?> Interesting temporary sacrifice, but only -0.52 (and getting better for the black with increasing depth of the analysis - not a good thing for white's prospects) after this line:

12. Ne6 dxe6 13. Qg4+ Bg5 14. Bxg5 h5 15. Qg3 Qd4 16. Bf6+ Qg4 17. Bxh8 Kxh8

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