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| Jul-21-06 | | Richerby: Just spent a few days working from home so today feels like a Monday -- I couldn't understand why the puzzle was so hard! |
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| Jul-21-06 | | DX1: I don't know if any of you know yet, but Alex passed away about a week ago at age 43. I am not sure of the exact cause - liver & internal bleeding?? His ashes will be taken to Poland and given to his mother for burial. Sorry to be the bearer of bad news:(( |
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Jul-21-06
 | | tpstar: <DX1> Yes, tragic news indeed . Condolences and remembrances could be shared here = Aleksander Wojtkiewicz |
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| Jul-21-06 | | percyblakeney: In the line with 53. ... Kf7 54. Nxf5 a1Q 55. Qxd7+ Kg6 white actually has a mate in five beginning with 56. Ne7+. |
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| Jul-21-06 | | JustAFish: I did the Kotov thing again this week and reproduced most of the lines cited here as well as a few others... for the first time... One such line:
52 Bxg6 Qxg6 then
53 Qxd7 Kh8
54 Qc8+ Qg8
55 Qxc3 Qa8
56 f7+ Kh7
57 Qc7 a1=q
58 F8=Q+ Qg7
59 Qxg7+
or 52 ... Kxg6
53 Nh4+ Kxg5
54 Nxf5 a1=Q
55 Qxa1 Bxa1
56 f7! which was the line played
or the suprizingly complicated:
52 Bxg6 Kh8
53 Qb8+ Bc8
54 Bxf5 a1=Q
55 Qxc8#
There are still other lines if, in the above lines, the king goes to g8, but they all work out in the end... |
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| Jul-21-06 | | YouRang: Cool! I found it (4/5 this week, stumbling on Wednesday). The tension in this position was between (1) Black's pawn promotion threat, and (2) White's coordinated attack on Black's king position. 52. Bxg6+! was a pretty obvious try, with 53. Nh4+ (winning the queen) in store if Black takes the bishop with his king. So I was expecting Black to take with the queen, after which we have 53. Qxd7+ If 53...Qg7 (blocking), then 54. Qd3+, winning the other bishop and stopping the pawn. If 53...Kh8 (or ...Kg8), then 54. Qc8+, with the same effect. So, I went back and reconsidered the other line (where Black loses his queen to the knight fork), and satisfied myself that Black could not promote his a-pawn AND stop White's f-pawn from promoting. Good puzzle! |
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Jul-21-06
 | | kevin86: I got this one mostly right. I figured up to Nxf5-so I missed the best part:( |
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| Jul-21-06 | | YouRang: For the curious: Black's final move, 59...Bd7 was a blunder that lost quickly. But even so, the position before that blunder was a mate-in-19 for White, according to the tablebase (and easy -- force Black to trade one bishop for the pawn, and the rest is elementary). If White didn't have that pawn on b3, however, thing are much murkier. It's still a "mate-in-35", but finding it might be beyond human skill. And it could be much harder: I saw some K+Q vs. K+B+B configurations that were "mate-in-74"! |
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| Jul-21-06 | | Sami Jr: <RandomVisitor>, <Eggman> I fail to see the value if white played 47.Bxg6+. Certainly if black responds 47...Kxg6 then 48.Nxh4# delivers a swift mate. But if black responds 47...fxg6 and if the continuation is 48.f7 Bg7, white can not promote his pawn to queen, and he just lost a bishop! Perhaps that is why Serawan did not play it. Am I missing something here? |
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| Jul-21-06 | | YouRang: <Sami Jr><Am I missing something here?> After 48. f7 Bg7:
click for larger view You are missing 49. Qg8# (pointed out by Eggman above). |
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| Jul-21-06 | | Sami Jr: <YouRang> Thanks! I see it now. Very nice diagram. Nice find <RandomVisitor>! |
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| Jul-21-06 | | Trouble: Perhaps I am missing something but this problem seems much more complicated than what has been pointed out. Ok 52.Bxg6+ Qxg6, 53.Qxd7+ Kh8, 54.Qc8+ Kh7, 55.Qxc3 and now Qb1 with the threat of queen. This is still very complicated. It seems white might have two candidate moves here: Qc7+ and Nd2. 56.Qc7+ keeps the attack going so is probably the most promising then Kg6, 57.Qg7+ leaving black two options Kf5 or Kh5. On 57...Kh5 white has the surprsing move 58. Kg3!! with what seems to be a forced mate(not 58.Qh6+ Kg4, 59.Qh4+ Kf5, 60.f7 Qc2+!, If Kf1 g1 or h1, black queens with check. On Kg3 Black plays Qc7+ and Qf7, on Kh3 Black can play Qc5 which is still unclear and very hard to calculate.) so black should instead play 57...Kf5 then 58.f7 leaving black two more moves a1=Q or Qc2+. On 58...Qc2+ white should play 59.Kh3(or 59Kg3 Qc7+, 60.Kh3 a1=Q, 61)f8=Q+! with a check/discovered attack leaving both black Queens en prise and 3 Queens attacked) after Kh3 white seems to be winning since black cannot queen without being captured so 58...a1=Q is probably better. then 59. f8=Q+, allowing black 59...Ke4 or 59...Kg4(59...Ke6, 60.Qe7+ and white mates) if 59...Ke4, 60. Qe7+ Kd3, 61.Qd8+ Kc2, 62.Qc5+ Kb2, 63.Q8d4+ Kxb3, 64.Q4b4# so instead 59...Kg4, 60.Qd7+ Kh5, 61.Qh6#. Of course there could be something I'm overlooking in all this...like Larsen said "long analysis, wrong analysis". |
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| Jul-21-06 | | Trouble: OK, I just checked my analysis with the computer and it was all correct!(yay) But the computer found an amazing move after 51.Bxg6+ Qxg6, 52.Qxd7+ Kh8, 53.Qc8+ Kh7, 54.Qxc3 Qb1, 55.Ne5!! Qe4+, 56.Kg3 Qb7, 57.Qc4! a1=Q, 58.g6+ Kh8, 59.Nf7+!!! Qxf7(...Kg8, 60.Nh6+ K any, 61.Qg8#), 60.Qc8+ Qg8, 61. Qh3+ With a beautiful smother-type mate dispite the fact that black is a full queen up. THIS IS AN AMAZING LINE, IF YOU DIDN'T FINISH MY ABOVE POST STUDY THIS VARIATION YOU WILL BE ENTHRALLED. |
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Jul-21-06
| | tpstar: <Trouble> Beautiful analysis - let's add diagrams: 52. Bxg6+! Qxg6 53. Qxd7+ Kh8 54. Qc8+ Kh7 55. Qxc3 Qb1 
click for larger view56. Ne5!! Qe4+ 57. Kg3 Qb7 58. Qc4! a1=Q 59. g6+ Kh8 60. Nf7+! Qxf7 61. Qc8+ Qg8 62. Qh3+ 
click for larger view |
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| Jul-21-06 | | weisyschwarz: Okay, it took 15 seconds, but I got it. Nothing else seemed to start the fire. |
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| Jul-21-06 | | BishopofBlunder: <YouRang: Cool! I found it (4/5 this week, stumbling on Wednesday). The tension in this position was between (1) Black's pawn promotion threat, and (2) White's coordinated attack on Black's king position. 52. Bxg6+! was a pretty obvious try, with 53. Nh4+ (winning the queen) in store if Black takes the bishop with his king. So I was expecting Black to take with the queen, after which we have 53. Qxd7+ If 53...Qg7 (blocking), then 54. Qd3+, winning the other bishop and stopping the pawn.> <YouRang>, If 53...Qg7, white simply plays 54.Qxg7# (white queen is protected by f6 pawn). |
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| Jul-21-06 | | pawntificator: I don't think you can count yourself as solving the puzzle if you didn't figure out that you had to promote a pawn. Therefore, I didn't solve the puzzle. It was so easy to solve my way, that I didn't even look at the black pawn promotion. I fail. But sometimes, in endgames, I have difficulty remembering which way is up when the pawns are all scattered about. |
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| Jul-22-06 | | percyblakeney: Very nice line by <Trouble>, can't say I saw that one, I stopped at 55. Qxc3 and thought it was over... |
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| Jul-22-06 | | dakgootje: Think i saw all and else certainly most of the main variations, though i missed blacks 54. ...Bc6 |
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| Jul-22-06 | | YouRang: <BishopOfBlunder> Yikes! So THAT'S why nobody else considered that line. :-p Thanks for correcting me. |
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| Aug-03-06 | | Richerby: <pawntificator: `But sometimes, in endgames, I have difficulty remembering which way is up when the pawns are all scattered about.'> That's easy to remember: up is the way the pieces don't fall when you knock them off the table. |
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Aug-06-06
 | | patzer2: The decoy 52. Bxg6+! is followed by a Knight Fork and the sacrifice of the Queen for Black's passer in order to Queen White's passed pawn. If 52...Qxg6, then 53. Qxd7+ Kg8 54. Qc8+ Kh7 55. Qxc3  wins easily. Note that the alternative 52. Qxa2?? loses after 52...Qh3+ 53. Kf2 Bd4+! 54. Nxd4 (54. Ke2 Qg2+  ) 54...Qh2+ . |
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| Mar-14-09 | | WhiteRook48: 59...Bd7? is erroneous |
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| Oct-23-11 | | Everett: This is Seirawan's pet system vs. the KID. When Black plays c5, White has a option to go into typical Benoni structures with cxd5 or play with an open e-file exd5, as played here. Also classic Seirawan is the straightforward 11.h3, giving up the two bishops but solidifying his space and clamp. Instead of the thematic 19.a4, Seirawan chooses an attack and plays 19.Ne4 and 20.b5. An instructive finish, worthy of inclusion in any endgame tactics book. The fact that Seirawan missed a win on move 47 gives us even more tactics to study. |
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| Sep-16-17 | | Xeroxx: 46. Bxg6+!! would have been a nice shot. |
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Kibitzing
sac: 52.Bxg6+