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Nov-12-11
 | | morfishine: <Patriot> Very good to zero-in right on 34...Qb1...sure wish I did <sevenseaman> IMO, I wouldn't call it easy, though finding the first move wasn't too hard: the 'best continuation' elevates it above "easy". That really is a cool variation that <Dr.J> tossed out there, very cool BTW: I don't see much on 33...Rc2 would be nice if that works too |
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Nov-12-11
 | | sevenseaman: <morfishine> <33. Rc2> works too. See my first comment wherein I have dealt with it, though not a full line. |
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| Nov-12-11 | | gofer: White has absolutely no stalemate threats, so I think this is a two part puzzle. The first part is forcing white to trade off Q+B for Q, leaving black in good shape in a "R+3P" against "N+2P" end game. The The second part is demonstrating a win in that end game. The first part seems reasonably simple...
<33 ... Qc2>
Black is threatening Rb3#/Qb3#
34 N anywhere Ra2#
34 Bc4 Rb4
Black is threatening Qb2#
34 N anywhere Rxa4#
34 Bc3 Rxb3#/Qxb3#
34 Qd1 Qb2#
34 Qe2 Qxc3 35 Ka2 Rxa4+ (Bb3 Qxb3# or the prosaic 35 ... Rxa3+ 36 Kxa3 Qb4#) 36 Kb1 Ra1# So white has to trade off.
<34 Qg2 Qxg2>
<35 Bxg2 Rxg2>
click for larger viewSo now to the second part, how does white win this endgame? It looks to me as if white must protect Pe5
and the only way to do that (or try to) is play Ne4.
<36 Ne4 Re1>
At this stage it seems that all black's moves are reactionary, with white making the choices and black
having little to choose from.
37 ... Nf6 38 Kg7 Nd7 39 Re3+ seems good for black as the white king is kept well away from it's A pawn
that is the only one that has a chance of promotion, so I think white will not go this way... <37 Nxc5 Rxe5>
<38 Kb4 Rd5>
White has the A pawn ready to roll, but black has the rook ready to stop it. In the meantime, the connected
black pawns can combine with black king and steamroller the white knight to its doom. So is this the win
we are looking for?
Time to check...
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Oh No! I looked at 33 ... Qc1 34 Na2 Qa1/Qb1 35 Bc4 but couldn't see the win, so went for Qc2 instead. So the only question left in my mind is the end game I found a win for black or not. It looks okay
to me, but without the benefit of silicon I am guessing. |
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Nov-12-11
 | | kevin86: I saw the sucker move 33... a2+?? 34  xa2  b4 not#} instead the move is c1!-setting up a deadly battery if 34 a8+ b8+ wins the queen |
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Nov-12-11
 | | scormus: Well, I got 33 ... Qc1 34 Qg3+ Kf8, and I even saw that 35 Na2 doesnt work. Does that qualify as solving it? .... er, what do you mean no? Like W I missed 34 Qg4+! and B wouldnt have the neat 37 Qb4#. In fact, I wouldnt have known what B should do to secure the win. A deceptively tricky puzzle |
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Nov-12-11
 | | Gilmoy: <al wazir: ... I'm sure I would have played it OTB (what else is there?) --> I say that frequently! (M. Tal: "so did I")
Often followed by "Oh. That! oops" |
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Nov-12-11
 | | Jimfromprovidence: I liked 33…Qc1 34 Qg3+ Kf8 35 Qe1 Ra2++ (to force the king to move away from the knight.
click for larger viewThen comes 36 Kxa2 Qxe1 (winning another piece next move) 
click for larger view |
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Nov-12-11
| | Gilmoy: <Jimfromprovidence: 35.Qe1 Ra2++> But simply 35..Qxe1 and Black still has mutual threat on the Bf1. Your diagram wins "only" an I-cut-you-choose decision on White. By minimax, White will save the more-useful minor piece, hence you're getting the Nc3 only if it's <worse> (by some millipawns) than the Bf1. |
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Nov-12-11
 | | chrisowen: Hatch for Qc1 method it is in the magnum pop cork or giant screw was it red in g3 f8. |
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Nov-12-11
| | chrisowen: Cant guess 35th but glima of hope Gu dynamo hold on wood stave level until g5 is hari kari xh6 lost in happen-stance try ad mob I lewd Rd2 if I recent mandate equality 13.g4 or Rd1 and ax I nd7 reign 0-0-0 gumballs again face g5 the honker! |
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| Nov-12-11 | | doubledrooks: 33...Qc1 threatening 34. Qa1+ or a nasty discovered check wins. For example: a. 34. Na2 Qb1
a.1 35. Bc4 Rxa2+ 36. Bxa2 Qb4#.
a.2 35. Qg4+ Kf8 36. Qc4 Rxa2+ 37. Qxa2 Qb4#
I overlooked the defense with 34. Qg4+ Kf8 35. Na2 Qb1 36. Bc4. It appears Black then wins with 36...Rc2 37. a5 Qb2+ 38. Ka4 Rc3 |
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Nov-12-11
| | Jimfromprovidence: <gilmoy> <But simply 35..Qxe1 and Black still has mutual threat on the Bf1.
Your diagram wins "only" an I-cut-you-choose decision on White. By minimax, White will save the more-useful minor piece, hence you're getting the Nc3 only if it's <worse> (by some millipawns) than the Bf1.> But the result is the same, isn't it? Black is up a queen and a pawn vs a bishop or knight instead of a queen and pawn vs. a knight. Plus to me the double check move lends a nice touch to the puzzle. |
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Nov-12-11
 | | M.Hassan: <Dr. j: I do not think that is at all "easy"> Agreed, your line is definitely not easy but I still think that it is easier than the normal Saturday category of "very difficult" |
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Nov-12-11
 | | SuperPatzer77: < Dr. J: I see a few commenters have called today's puzzle "easy". I would like to know if any of them saw the following variation: 33...Qc1 34 Qg4+ Kf8 35 Na2 Qb1 36 Bc4 Rc2! 37 a5 Qb2+ 38 Kh4 Rc3! 39 Nxc3 Qb4#
I do not think that is at all "easy".>
Excellent analysis <Dr. J> Black's strong move is 33...Qc1!
click for larger view34. Qg4+ (only move to defend against Qb4#) Kf8, 35. Bc4 (best) Rc2!! (threatening Qb2#), 36. a5 (only move) Qb2+, 37. Ka4 Rc3! (threatening Ra3#), 38. Nxc3 Qb4# 0-1 - It is an excellent analysis by <Dr. J> !! Great game by WGM Gu Xiaobing of China!!
SuperPatzer77 |
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Nov-12-11
| | SuperPatzer77: <neenu: How about:
34. Na2 Qc1 35. Qa8+ Kg7 36. Bc4>
<neenu> You mean 34. Na2 Qb1?
click for larger viewYou should take a look at <Dr. J>'s analysis - similar to yours. 33...Qc1!, 34. Na2 Qb1, 35. Qa8+ Kg7, 36. Bc4 Now Black then wins (see diagram below:) 
click for larger view36...Rc2! (threatening Qb2#), 37. a5 (only move) Qb2+, 38. Ka4 Rc3! (threatening Ra3#), 39. Nxc3 Qb4#  <neenu> It is almost similar to Dr. J's analysis. SuperPatzer77 |
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| Nov-12-11 | | BOSTER: <Dr. J> Your analysis is very nice, but maybe the winning for black will be not so perfect if white play 33...Qc1 34.Na2 Rf2+ 35.Nxc1 Rxf3+ and then give up one piece. |
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Nov-12-11
| | SuperPatzer77: <BOSTER: <Dr. J> Your analysis is very nice, but maybe the winning for black will be not so perfect if white play 33...Qc1 34.Na2 Rf2+ 35.Nxc1 Rxf3+ and then give up one piece.> <Boster> IMO, <Dr. J>'s analysis is 100% perfect. 33...Qc1! 34. Na2 Qb1 (much stronger than 34...Rf2+ (discovered check)) So, you should take a look at <morfishine>'s commentary because it can lead to an inevitable checkmate. Also, take a look at my answer to <neenu>'s question. <Dr. J>'s analysis is just perfect. SuperPatzer77 |
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| Nov-12-11 | | dufferps: I can't understand white's resignation.
I see 36.Bc4 as a strong response with no easy victory for black. |
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Nov-12-11
 | | mathematician: <Dufferps Bc4>
36.Bc4 Rxa2 and mate on b4 |
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| Nov-12-11 | | dufferps: Okay - Now I see -
36. Bc4 Rxa2+ 37. Bxa2 Qb4#.
That explains white's resignation after
35. ... Qb1. |
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Nov-12-11
 | | profK: The humble pawn on c5 is very important to black, almost as much as white's a4 pawn as a constraint to white. |
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Nov-12-11
| | SuperPatzer77: <profK: The humble pawn on c5 is very important to black, almost as much as white's a4 pawn as a constraint to white. > <profK> Amen to that!!! SuperPatzer77 |
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| Nov-12-11 | | BOSTER: <Super Patzer77> <34...Qb1 much stronger than...Rf2+> .
This is sound for you,but not for me. |
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Nov-12-11
| | SuperPatzer77: <Boster> You should take a look at <morfishine>'s commentary. You may stand corrected. It is N with a-pawn vs Rook with c-pawn. This ending is not easy for Black to win this game. Like <Morfishine> said, 34...Qb1! is much more efficient than 34...Rf2+. Most of us would agree with this move - 34...Qb1! because it sure gives Black an easy win. SuperPatzer77 |
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| Nov-12-11 | | stst: No immediate win, but Bk will gain an advantage after
33......Qc1
34.Bc4 Qa1+
35.Ba2 c4
36.Qd1 Rb3+
37.Qxb3 cxb3
38.Kxb3
and Bk is Q vs W's B&N |
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sac: 32...Qd2
and 
buttons, but it's much easier to simply use the left and right arrow keys on your keyboard.