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Aug-26-07
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| zanshin: <mallocks: Arena 1.99 Beta 3.3 (apparently)> <mallocks> Thanks. I tried Arena and Rybka but settled for the integrated package of Fritz. However, I might later add Rybka and use Fritz as the GUI per <RV>'s advice. |
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Aug-26-07
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| al wazir: <HelaNubo>: Thanks. I guess I'm the impatient type. That's why I play blitz instead of correspondence chess. But after 33. Rxa8 Rxa8, white plays 34. Qb2, not 34. Qxa8. If now 34... Ne3+, then 35. Bxe3. What's next? Ah, I see: 34...Qxb2 35. Rxb2 Ra1+ 36. Be1 d2. |
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Aug-26-07
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| zanshin: <LDPorter: So, why not 33.Ra7? Wouldn't that put black in a world of hurt?>
click for larger viewAnalysis by Fritz 10 (19-ply):
1.  (-9.98): 33...Rec8 34.Rxa8 Rxa8 35.Qxa8
2. (-5.84): 33...Ne3+ 34.Kg1 Nd1 35.Qa2 Qxa2 36.Rxa2 Rxa2 37.Rxd1 Rea8 38.Nb3 Rb2 39.Na5 Rxb4 40.Bb6 Rc8 41.Kf1 Rc1 3. (-4.84): 33...Rac8 34.Qa1 Rc2 35.Nxc2 dxc2 36.Rc1 Qxc1+ 37.Qxc1 Bxc1 38.exd5 Bf4 39.Rxf7+ Kh6 40.Rc7 c1Q+ 41.Rxc1 |
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| Aug-26-07 |
| Billosky: <I was sure Nxd5 was the way to go, but couldn't find the continuation Rac8 with the back row mate idea; I was looking to queen the pawn.> Exactly the case with me. At least I got the first move for each day's puzzle this week. I think that's a first. So I would have a great chess future ahead of me -- provided I were 7, instead of 52! |
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| Aug-26-07 |
| cheski: <RandomVisitor: After 32...Nxd5:
>
Does your programme make mention of Nxd5 for Black when looking for White's move 32 ?And does anybody have any ideas on why the engines have difficulty coming up with this Nxd5? |
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| Aug-26-07 |
| jmi: jmi: <jahhaj: Is it legal in OTB play to make notes? This issue came up in my league recently and the consensus was that it is legal. Anyone else have an opinion?> It's illegal.
See Geurt Gijssen's answer to the second question:
http://www.chesscafe.com/text/geurt...
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| Aug-26-07 |
| Fezzik: Jmi's right. In fact, we can't even write down our move before making it anymore. Apparently people would write down a move (or two or three), cross out the move(s) and write down another. The scorecard is the *official* record of the game and as such should only contain moves that were actually made. The appropriate order for making a move now is: a)make the move (with one hand), b)write down the move, c) hit the clock. This is in the FIDE and now USCF rule books. |
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| Aug-26-07 |
| Fezzik: Regarding the combination that was played: I saw that Black needed to gain control of e3, and so saw Nxd5. I just didn't see a way for it to work so I missed this puzzle. Even with computer confirmation that Tisdall played correctly, my mind can't accept that this was completely correct! I'm going to have to analyse this one very closely. Great choice for a Sunday puzzle, cg.com!
(grrrrr) |
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Aug-26-07
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| fm avari viraf: It's a very complex position but still I would go for a speculative 32...Nxd5 33.exd5 Of course, the text move 33...Rac8! is simply imaginative. Actually, I was looking for 33...Re2 if 34.Nxe2 Qxe2+ 35.Kg1 Rc8 with winning advantage. |
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Aug-26-07
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| patzer2: Black solves today's insanely difficult Sunday puzzle with the sham sacrifice 32...Nxd5!!, providing clearance for a Rook to dominate the c-file and set up a winning attack against White's exposed and helpless King. |
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Aug-26-07
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| RandomVisitor: Rybka takes 3 minutes and 21 seconds to find the winning 32...Nxd5 at a depth of 18 ply. Rybka gets hung up with the response 33.Rxa8, and takes a while to see that this move does not work for white. |
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Aug-26-07
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| MostlyAverageJoe: <RV> Well, to keep the record complete, Hiarcs11.2MP found it after 13 plies (82 seconds runtime). Much easier puzzle (for software) than 2 days ago. It initially considered 33.Rxa8 to be the best response as well, but only for about 10-15 seconds. |
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Aug-26-07
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| MostlyAverageJoe: Personally, I considered the first move (32...Nxd5) but did not have patience to analyze the multitude of resulting combinations resulting if white did not take the bait. And I missed Rc8, which is the only winning move after 33.exd5. BTW, the line played by the black in the game was rather suicidal. After 32. ... Nxd5, several responses are quite a bit better (Qa1, Nb3, Qb2) long term, although they do seem to provide quick gains. As mentioned, after 33.exd5, only Rc8 wins, but it wins much bigger than a number of lines refusing the sac. Thus, 33.exd5 is justifiable on the grounds that the uniqueness of the winning continuation increases likelihood of a blunder. But what's the idea with 34.Be1? -- Ra7 would be the best response, and several other moves are also better. And 36.Qa2? allows mate in 2, so why not resign outright? My Hiarcs-assisted analysis says that the best line for both sides is as follows (where ! signifies a much better move than any alternative, and <!> signifies the unique winning move - which is frequently quite obvious and/or forced): 32. ... Nxd5 33. Qb2 Qxb2 34. Rxb2! Bc1 <about a pawn's worth better than d2 - I am surprised Rybka did not find it> 35. Rb3! <Rxa8 disproved only after deeper analysis> Nxb4! 36. Rxa8<Rxb4 also good> Rxa8 37. Rxb4<Be1 also good> Ra1<!> 38. Nb3! Rb1<!> 39. Be1! d2! 40. Nxd2! Rxb4<!> 41. Ke2 and in the resulting postion: 
click for larger view black is clearly going to win. |
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| Aug-26-07 |
| LDPorter: Thanks for the feedback, zanshin. Continuation for 33.Ra7 . . . Rec8 34.Rxf7+ What does black do now?
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Aug-26-07
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| MostlyAverageJoe: <ellhares> and <fm avari viraf> I don't know whether you noticed, since it seems to have been posted only by <Marmot PFL>, but after 33.Re2, black's response Be1! draws. |
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Aug-26-07
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| MostlyAverageJoe: <LDPorter: Thanks for the feedback, zanshin. Continuation for 33.Ra7 . . . Rec8 34.Rxf7+
What does black do now? >
Kg8, what else? No need for computer analysis to see that white is about to suffer removal of major pieces from the board. |
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Aug-26-07
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| zanshin: <LDPorter: Thanks for the feedback, zanshin. Continuation for 33.Ra7 . . . Rec8 34.Rxf7+> <MAJ> is right. But just for the record, here's Fritz at only 18-ply. 
click for larger view1. (-16.90): 34...Kg8 35.Qb2 Qxb2 36.Rxb2 Ne3+ 37.Kg1 Rc1+ 38.Be1 Kxf7 39.f4 Bxf4 40.Kf2 Nd1+ 41.Kf3 2. (-7.90): 34...Kh8 35.Qb2 Qxb2 36.Rxb2 Rc1+ 37.Be1 Ne3+ 38.Kg1 Rxe1+ 39.Kf2 Rf1+ 40.Kg3 Nc4 41.Rb3 d2 42.Rd3 Ne5 43.Rxd2 3. (-6.48): 34...Bg7 35.Qb2 Qxb2 36.Rxb2 Ra1+ 37.Be1 Ne3+ 38.Kg1 Rxe1+ 39.Kf2 Rc2+ 40.Rxc2 Nxc2 41.Rb7 d2 42.Nxc2 Rxe4 43.fxe4 d1Q 44.Ne3 Qd2+ 45.Kf3 Qxb4 46.g4 |
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| Aug-26-07 |
| LDPorter: Instead of 35.Qb2, try 35.Rb2
Wouldn't that force . . .Qxb2 36.Qxb2 or a queen exchange with . . .Rxa3 37.Rxd2? Where does that leave us?
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Aug-26-07
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| zanshin: <LDPorter: Instead of 35.Qb2, try 35.Rb2> Short and sweet result here:
click for larger view1. (-#2): 35...Rc1+ 36.Be1 Rxe1#
2. (-#3): 35...Ne3+ 36.Kg1 Rc1+ 37.Be1 Rxe1# |
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| Aug-26-07 |
| LDPorter: The more I look at this the more I see white's position as totally untenable. Thanks for the feedback -- very helpful. |
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Aug-26-07
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| zanshin: <LDPorter: Thanks for the feedback -- very helpful.> No problem. It was my pleasure. |
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| Aug-26-07 |
| OBIT: Wow, so that's why I could never beat this guy. |
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| Aug-26-07 |
| TrueBlue: totally missed this one.
I saw 32 .. Nxd5 33.
Rxa8 Rxa8 34. Qxa8 Ne3+ 35. Kg1
and I don't see any advantage for black
my line was 32 .. Rxa5 33.
Qxa5 Nxd5 34. exd5 Rc8 35. Be1 Rc1 36. Rxc1 Qxc1 37. Nb3 Qc2 38. Nd4 Qd1
39. f4 d2 40. Nf3 dxe1=Q+ 41. Nxe1 Qxd5 42. Nf3
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Aug-27-07
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| euripides: On the 'notes' question; when I checked the FIDE site I found that it is the use of notes that is prohibited. So if you make notes for future reference, rather than to assist your play at the board, you could argue this was legal. But I think it might be tricky to persuade an arbiter of the purity of your intentions. The recording of a move before it is played is specifically prohibited under another clause. |
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Aug-27-07
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| kevin86: A lot of misdirection in this puzzle. First open one line then attack down another. Finally sac the queen to end in a briilant mate aided by a lowly pawn. |
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