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Later Kibitzing> |
| Mar-30-12 | | newzild: White chose to follow my side-variation, which I thought looked clearly bad for him. I'd be curious to know if my main line works or not. |
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| Mar-30-12 | | newzild: I'm going to give myself a point, but I think I did miss a little finesse in my main line after 40. g6 a4
Now, instead of 41. gxf7, White can also try 41. g7, but after 41...Ne8 (41...Nf5 is only check if White's king went to d4 on move 35) 42. Bxf7 Nxg7 Black's h-pawn helps him to win. Still, I think this ending is quite technical for a Friday. |
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Mar-30-12
 | | diagonalley: OTB i'm sure i would have started with the pedestrian 34 ....f6+, in fact playing it through, it also appears to win(?) |
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| Mar-30-12 | | Teris: I got a Friday puzzle right. Never did that before. This one must be easy! |
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Mar-30-12
 | | Once: Everyone has covered the game continuation, but Herr Fritz would like to point out that 34....Kxb3 also works ... if you follow it up correctly. 34...Kxb3 35. Bxf7 Kc3 (not 35...Nc4+ 36. Kd4)
click for larger viewNow black's threat is Nc4 followed by running the a pawn. By playing 35...Kc3, black makes Kd4 impossible. So white has to play 36. Ba2. But then black runs the a and c pawns forward and white can't stop one of them from queening. But ... I still prefer the game line. A knight sac to block with your opponent's own pawn is one of those little chess delights that light up the board. It's a little piece of chess magic. |
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Mar-30-12
 | | scormus: <Once ... 34 ... Kxb3> Yes, youre right. I wondered about that, in fact it was the first move I thought of, but then I saw 35 ... Nc4+ fails and I went off the idea. Trouble is ... Kxb3 35 Bf7+ Kc3 simply doesnt look sexy enough for a Friday puzzle. Not a criticism I'd make of 34 ... Nxc4+
;) |
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| Mar-30-12 | | pkkandel: ???? What a puzzle is this? Black will lose after 35.bxc4 c5 36.Bh7! a4 37.Bb1 a3 38.Kd5!! If 37...c6 then h6. With at least a draw.
Without thinking best and winning move is Kxb3 and any fool can do that!!!! |
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Mar-30-12
 | | whiteshark: Removal and blockade sacrifice |
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| Mar-30-12 | | fokers13: <pkkandel> missed 36..g6 and 0-1 is easy from there on. |
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| Mar-30-12 | | Sularus: Got it! Actually I just solved up to black's c5 blockading move and then stopped solving. Funny how sometimes Fridays are easier than Tuesdays for me. |
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| Mar-30-12 | | Limpin Kt: This puzzle classically demonstrates the power of passed pawns. Anybody who is familiar with <end game studies> will know the solution instinctively to this puzzle. GarryKasparov has described the theme of dominating the bishop in long diagonal very beautifully in his book- domination in endgame studies. The solution starts with sac of the gallant knight- 34...Nc4! 35.bc c5! <the point!> and the king shepherds the pawn safely to queening square. |
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Mar-30-12
 | | WinKing: <pkkandel: ???? What a puzzle is this? Black will lose after 35.bxc4 c5 36.Bh7! a4 37.Bb1 a3 38.Kd5!!> Not 35.bxc4 c5 36.Bh7! a4?
Try 36...g6! |
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| Mar-30-12 | | SimonWebbsTiger: @<LTJ>
<<SimonWebbsTiger> I was posting my correction, while you posted yours. Could you kindly delete yours. I knew as soon as I saw the game score.LTJ>
erm....no. Why would you want me to? |
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Mar-30-12
 | | sevenseaman: So thats that. 35. Kd4 is of no consequence with Black putting the N on d6; (says <Gypsy>). 34...Kxb3 perhaps also wins as pointed out by <Once> (in collusion with Herr Fritz). To me the move looked anti-intuitive and a way of making an easy job difficult. <34...Nc4> sort of paralyses White's resource deployment. It appealed to me as sound & having some psychological impact as a bonus. |
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Mar-30-12
 | | OhioChessFan: I am reminded of a discussion on <hms123> forum about a similar position where the key move was missed. See: hms123 chessforum The game in question was:
Levitina vs B Marinello, 1994 |
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Mar-30-12
 | | Memethecat: The past 2mths of intensely studying Petrosian makes this type of puzzle a bit more easy than it would have been previously, I hope. 34...Nc4+ 35bxc4¹ c5²
¹35Ke~ Kxb4 36Bxf7 Kc3 & the a pawn easily Qs. or 35Kd~ Nd6 traps the B & the a pawn easily Qs. ²black uses whites own pawn to block the B. The a pawn is now free to march home & white is unable to stop it. Both efforts: 36Bh7 g6 & 36Bxf7 a4 37Bg6 a3 38Bb1 Kc3 are doomed to fail. ******
Black preferred 38...Kb3 instead of Kc3, but I think both work equally well. Thanks to Tigran for the lessons. |
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Mar-30-12
 | | Patriot: Black is up a pawn.
White threatens 35.Bxf7.
The first thing I see is 34...Kxb3 35.Bxf7+ which lead me to immediately consider 34...Nc4+ with the idea of 35.bxc4 c5 to cut off the bishop's defense along the a2-g8 diagonal. White seems helpless in that line to stop the a-pawn. So white will likely play 35.Kd4. So 34...Nc4+ 35.Kd4;
35...Nd2 36.Kd3 Nxb3 37.Bxf7 a4 38.Kc2 c5 39.h4 c4 40.Kb2 a3+ 41.Ka2 Nc1+ 42.Ka1 Kb3 (42.Kb1 a2+ 43.Ka1 Nd3 44.h5 Ne1 similar to main line) 43.h5 Nd3 44.g4 Ne1 45.g5 Nc2+ 46.Kb1 a2+  |
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| Mar-30-12 | | CHESSTTCAMPS: In this endgame position, black has N+P for a bishop, the better king position, and the most advanced
pawn on the board at a5. In so many endgames, a single pawn tempo can easily be worth a rook or a
queen. In this position, black should not play the "natural" 34... Kxb3? in view of 35.Bxf7+
Kc3 (Nc4?? 36.Kd4 winning) 36.Ba2! (otherwise 36...Nc4+ cuts off the B) Kb2 37.Bd6 where white's h-pawn
keeps him in the game. There is a much simpler approach to queening the a-pawn. 34... Nc4+! I had this move in a jiffy - I have seen this theme before. A) 35.bxc4 c5! (black can't allow 36.c5, allowing white to reestablish control of a2) 36.Bxf7 a4 37.Bg6 a3 38.Bb1
Kc3 followed by Kb2 wins.
A.1) 36.Bh7 g6! 37.h4 a4 39.h5 a3 40.hg fg 41.Bxg6 a2 wins. A.2) 36.Ke4 a4 38.Kd3 Kb3 cuts off the WK and promotes the a-pawn. B) 35.K any Nd6(+) followed by 36... Kxb3 and the a-pawn promotes. Time for review... |
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Mar-30-12
| | sevenseaman: <OhioChessFan> Oh my God! Monstrous; diabolical! And unlike you it took me more than a few seconds, I'll admit. But it hit me like a sledge hammer. Marinello must have been some young innocent girl to have actually gone on to lose the game. So very sharp of <hms123> to have brought up the discussion; very educative and relevant to today's POTD. Am I aghast to think of what all I must be missing OTB? |
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Mar-30-12
 | | paulalbert: Surprisingly saw the idea instantly and with a little bit of counting I saw that it works. |
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| Mar-30-12 | | Penguincw: Ooh. I didn't get the first move. Sinks down to 3.5/5. |
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| Mar-30-12 | | pkkandel: <Fokers13> and <WinKing> Thanks Guys... Really great advice. |
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Mar-30-12
 | | Eisenheim: one of those mornings where I got it right right away for all the wrong reasons! |
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Mar-30-12
 | | David2009: R Garcia vs J A Rubinetti, 1972 Black 34? 34...Nc4+ 35.bxc4 c5!! promotes in all variations after bxc4: if 35.Kd4 Nd2 nets the Pawn on b3 anyway.
Main variation: 34...Nc4+ 35. bxc4 c5! (not 35...a4?? 36 c5! turning the tables) 36.Bxf7 a4 37.Bg6 a2 38.Bb1 Kc3 and the Pawn does indeed promote.
Time to check:
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Got it. Here's the puzzle position
click for larger view colours reversed
click for larger view
with a link to Crafty End Game Trainer to make sure:
http://www.chessvideos.tv/endgame-t...
The EGT goes for a fortress blockade which I colud not break first time round. Try your luck! - thr robot's defence is most interesting. With normal colours, the variation proceeds 34...Nc4+ 35.bxc4 c5 36.Bh7 g6 37.f4 a4 38.Kf6 a3 39.Bg8 a2 40.Bxf7 a1=Q+ 41.Kxg6 to reach
click for larger view
and how does Black propose now to break through?
PRE-POST SCRIPT: I have now read <Once's> post. Was 34...Nc4+!? a drawing blunder and should Black have played 34...Kxb3! Chess can be a cruel game... |
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Mar-30-12
| | sevenseaman: Short of firepower and coming off the POTD ambiance, this position had many ifs and buts for me. Mostly it depends on how White disposes. In the end I just managed to shake off the 'promotion' thingy and pushed the right button. #13174
click for larger viewb. But the POTD theme was fully resurrected by this one. #92886
click for larger vieww. |
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sac: 34...Nc4+