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| Apr-14-12 | | JG27Pyth: Very pleasant! Wonderful even. Not as difficult as the typical Saturday perhaps... but more fun. |
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| Apr-14-12 | | JohnBoy: Already after 9...f5 black is posing difficult questions to white. I am curious as to how white got so tied up. There is plenty of analysis of the last few moves, but not much of the game as a whole. |
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| Apr-14-12 | | whiteshark: Working on the pin was the only (tactical) thing applyable in the position. |
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| Apr-14-12 | | agb2002: Black has a bishop for a knight.
White is about to unpin the knight with 25.Kd1.
This suggests 24... Rxd2 25.Rxd2 (25.Rh5 Rd6+) 25... Rd8 26.Rhd1 c4, tying the white king to the defense of the rook on d2. White can't stop the advance of a black pawn to b4 (27.a4 b6 followed by a6, b5, etc.) and the threat bxc3 decides the game (cxb4 c3 and ... cxd2). Finally, White can't block the bishop with g4, h4, g5 because the squares e3 and f4 are available. |
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| Apr-14-12 | | sevenseaman: Thanks <jfp> and <PB>. I enjoyed "The Tomb". The undertaker Zuk operates it with remorseless precision. I was constantly reminded of the Balzac short story, 'The Mysterious Mansion'. In that great story of all time, the Count entombs his lady's Spanish lover alive in a room he knew the Spaniard was hiding in, after she swore fidelity to the Count on a Crucifix that the Count knew belonged to her lover. Not leaving her chambre for next few days (till the mortar hardened irrevokably) was like Zuk letting Harper twist and turn till he could breathe no more. How chess imitates life! Thanks, both of you. |
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| Apr-14-12 | | David2009: Kaplan vs Bronstein, 1975 Black 24...? 24...Rxd2 25 Rxd2 Rd8 26 Rd1 c4 zugzwang. Sooner or later the King must move and White will lose a N.
Check:
====
I had missed the try 27.g4 threatening g5 but met by the obvious 27...Bf4. |
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| Apr-14-12 | | CHESSTTCAMPS: In this endgame position, black has B for N under the most favorable conditions for that match-up, with bishop pinning knight and a rook on the 2nd to reinforce the pin. The doubled c-pawn multiplies white's woes, disabling Kc2 as a way to break the pin. If white were on the move, he should probably play Kd1 or c4. Black would have good winning chances with the obvious 24... Rxg2, but there is a clear way to provoke a quick resignation: 24... Rxd2! 25.Rxd2 Rd8 26.Rd1 c4!
By eliminating the maneuver c4-c3-Kc2, black constructs a classic zugzwang, with no way for the WK to break the pin without abandoning d2. White can try 27.g4, hoping for a pass, e.g. 27... a5?? 28.g5! Bxg5 29.Rg1 wins! But 27... Bf4! avoids the trap and white can play until all pawn moves are exhausted or resign immediately. Time for review.... |
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| Apr-14-12 | | CHESSTTCAMPS: <Jimfromprovidence> illustrated a plausible way for a trap to be sprung. Even against a world class opponent, Kaplan probably should have played one more move (27.g4) on principle. |
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| Apr-14-12 | | rhickma4: This looks straightforward for Saturday.
24...Rxd2+ 25.Rxd2 Rd8 26.Rd1 c4
White is totally tied up, and eventually will be in zugzwang, |
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| Apr-14-12 | | morfishine: Black prods White to his fate with <24...Rxd2 25.Rxd2 Rd8 26.Rd1> and now <26...c4> "Seals the deal"...Initially figured by intuition that 26...c4 was best; only after looking further and digesting the piece formations, did I fully realize how hopeless White's position is: what-with his rook pinned and his King permanently in prison on <c1>, he has no freedom of movement |
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| Apr-14-12 | | newzild: Easiest Saturday in living memory. |
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Apr-14-12
 | | paulalbert: Like many others, I found this one relatively easy for Saturday. |
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| Apr-14-12 | | gofer: Some part of me still wants to play Rxg2 making Pf7 into huge passed pawn, but
there is a more subtle approach which gives white absolutely no play what so ever. <24 ... Rxd2!>
The following is unavoidable for white and means that probably white has to accept
the loss of the knight and try for a counter attack... <25 Rxd2 Rd8>
26 Rhd1 c4!
The pin is unbreakable. Pc2 Pc3 and Rd2 are all stuck. If the king or rook moves then white goes a bishop down.
There is nothing for white to do but wait for his own death and that involves moving one of Pa2, Pg2 and Ph3
into worse positions, which really isn't an option for white. So the only alternative is to
give up the knight!
<26 Kb2 Rxd2>
<27 g4 ...>
Okay, for Bronstein, this would be a walk in the park. A full bishop up and a better pawn
structure as well. But I think it would take me quite a while to win this one... Time to check... |
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Apr-14-12
 | | FSR: <Jimfromprovidence>'s idea of 27.g4! in the final position is an excellent attempt at a swindle. Many people (though not Bronstein, I daresay) would cockily play something like 27...b5??, when 28.g5! would make them turn beet red. How would Bronstein have met 21.Re1? This seems awkward for him. Ditto with 22.Re1. |
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| Apr-14-12 | | goodevans: Just back from a few days visiting Istanbul. Wonderful place. It seems CG.com held back the "Monday" puzzle for my return! |
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| Apr-14-12 | | estrick: <FSR> Someone posted some of Bronstein's notes about this game from his book "The Sorcerer's Apprentice" earlier in this thread. He said 21. Re1 is answered by Qg3 and White's back rank weakness will do him in |
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Apr-14-12
| | FSR: <estrick> Thanks! I have that book, I believe. I will check out his analysis. |
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| Apr-14-12 | | psmith: This didn't seem difficult at all to me. It is pretty obvious that after 24...Rxd2 as in the game White is going to end up running out of moves and will then lose a piece. |
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| Apr-14-12 | | WinKing: <rilkefan: I suspect one needs to see 27.g4 Bf4 in the ...c4 line for full credit if one is a real stickler.> Absolutely right <rilkefan>! You & <Jimfromprovidence> have keenly brought this to our attention. I missed this possibility earlier in my analysis. As soon as white plays 'g4' the black bishop must move somewhere else along the c1-h6 diagonal or risk being pinned (eg.27.g4 b5 28.g5 Bxg5 29.Rg1). Black must still be wary of such tricks. 
click for larger viewI think the old saying "It ain't over till it's over" applies here. |
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| Apr-14-12 | | sevenseaman: Too many options tantalise.
click for larger vieww. |
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| Apr-14-12 | | kevin86: Black sacs rook for knight in order to put white's rook in handcuffs. Neither rook nor king can more and when pawn moves run out,the rook must be abandoned. |
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| Apr-14-12 | | Deji: Neat! Zugzwang |
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Apr-14-12
| | FSR: Regarding the different varieties of zugzwang, which <Jimfromprovidence> alluded to, see this discussion in Wikipedia: http://bit.ly/HTSBGn. The ultimate is "full-point mutual zugzwang," where whoever is on move loses. The only common example of this is the classic "trébuchet" position:
click for larger viewHere is another instance from actual play (taken from the above-cited Wikipedia article): 
click for larger viewAgain, full-point mutual zugzwang: whoever is on move loses. |
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| Apr-14-12 | | BOSTER: I know this position from Bronstein's books.
After 24..Rxd2 25. Rxd2 Rd8 26.Rd1 c4-is the key move.
Bronstein wrote:"After exhausting all his moves, like it or not white has to move one of his pieces". The brilliance has different colour.
If yesterday <POTD> the nice trade: one rook for a pawn, another rook for the knight, and black queen as a gift for a real deal won a brilliant prize, today <POTD> only "simple" c4 made the game unforgettable. |
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Apr-14-12
 | | Jimfromprovidence: Keeping with the thread of <FSR>, here's another example of reciprocal zugzwang (where the player that has to move is made worse off). It may be counterintuitive because of the symmetry of the position, but in this case if white moves first it's a draw, but if black moves first white wins. 
click for larger viewAgain, these examples come from Nunn's endgame book. I found the book extremely challenging, so much so that I had it for two years before I could understand the most baisc things he was talking about. Now I refer to it all of the time. |
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Kibitzing
sac: 24...Rxd2