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Oct-05-08
 | | johnlspouge: Sunday (Insane):
H Grooten vs Motylev, 2003 (35…?) Black to play and win.
Material: B for R+N. The White Ke7 is stalemated. The White position is completely disorganized. Because Pf3 is base of the defense, 35….Rxd2+ makes the White position collapse. Candidates (35…): Rxd2+
35….Rxd2+
White has 3 legal moves:
(1) 36.Rxd2 Qxf3# (Dovetail Mate)
(2) 36.Kxd2 Nxf3+
(2.1) 37.Kd3 Nxe1+ 38.Bxe1 [Rxe1 Qf3+]
38…Qf1+ 39.Kmoves g2
White must sacrifice a piece to prevent g1=Q.
(2.2) 37.Kc2 Nxe1+ 38.Bxe1 [Rxe1 Qg2]
38…Qf1 (threatening 39…g2 40…g1=Q)
Again, White must sacrifice a piece to prevent g1=Q.
(2.3) 37.Ke2 Nxe1 38.Bxe1 [Rxe1 Qg2] [Kxe1 Qg2]
38...Qf1+ 39.K moves g2
Yet again, White must sacrifice a piece to prevent g1=Q. (3) 36.Qxd2 Qxf3+ 37.Ke1 Qg2 (threatening 38…Qf1# or 38…Qf2#) White cannot increase the protection of Bf2. Under a mate-on-1 threat that he cannot defend directly, he must either (1) flee or (2) counterattack with check: (3.1) 38.Ke2 gxf2 (threatening 39…Qf3# or 39…f1=Q#)
39.Kd3 Nf3 40.Q moves Nh2 (threatening 40...f1=Q)
(3.2) 38.Qd8+ Kh7 (threatening (A) 39…Qxf2#, (B) 39.Rd2 Qf1#, (C) 39.R other Qxf2+ 40…Bg4#, or (D) 39.Bxg3 Nf3#)
39.Kd2 gxf2
(threatening 40…Nf3+ 41…Nh2 42...f1=Q as in Variation (3.1)) White will lose at least a R to prevent f1=Q. |
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| Oct-05-08 | | znprdx: I had been hoping for an exquisitely elegant quiet move problem to top off this weeks series of starkly precision executions. This hardly qualifies as an 'insanse' (Sunday) challenge, although the posts questioning the outcome may be the real puzzle.... As both <Terry McCracken:> & <An Englishman:> pointed out ...30.Rd3 is the point of pure inspiration - yet Black almost seemed unsure how to proceed after the obvious key move at 10 ply. 30.Kf1 was well beyond my comprehension...<Kingdumb:> perhaps this was the blunder you are looking for? Whenever I try this type of profound strategy I usually end up being crushed... |
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| Oct-05-08 | | Antonius Blok: Just found the 3 first moves, but after 38.Ke2 I played 38... f3+ |
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| Oct-05-08 | | melv: What happens if the white king simply runs away with 43. Kc2? |
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| Oct-05-08 | | sfm: <whiteshark: What's the end after 42.Kd3?>
Ah, well, if you must ask: nothing decisive really. But can you please stop destroying the pleasure of all those who enjoy having found the solution? |
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Oct-05-08
 | | Jimfromprovidence: <Whiteshark> <What's the end after <42.Kd3>?> I think you just found the insane part.
I see 42…Nf3, threatening Ne1+ or f1Q+.
click for larger viewIf 43 Kc4, then 43…a5!, threatening Be6+.
If 43 Ne2, then 43…Ne1+. Now, if 44 Rxe1 44… Qf3+.
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Oct-05-08
 | | parmetd: talk about easy... how does this qualify as insane? |
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Oct-05-08
| | johnlspouge: Toga II 1.3.1 gives the following evaluation of 30...Rd3. Humans can improve near the end of the full computer variation for best play. [ply 17/65- time 07:29 value (to White) -1.37]
<30...Rd3> 31.Qxd3 Qxg2 32.Qf1 Qh1 33.Ke2 Bh3 34.Qe1 Rd8 35.Ncb1 Qg2+ 36.Bf2 Ne6 37.Nc4 Nd4+ 38.Rxd4 exd4 39.Nb2 d3+ 40.Nxd3 Rxd3 41.Kxd3 gxf2 42.Qe2 f1Q 43.Rxf1 Qxf1 44.Qxf1 Bxf1+ 45.Kc2 Bd4 46.Nd2 Toga gives the following as best play after move 30. if 30...Rd3 is not entered by a human (i.e., me :) [ply 17/56 time 06:14 value (to White) -1.02]
30...Bf6 31.Ke2 Bh3 32.gxh3 Nxh3 33.Nc4 g2 34.Qe1 Bh4 35.Qxh4 Nxg1+ 36.Rxg1 Qxh4 37.Rxg2+ Kh7 38.Nxe5 Qh5 39.b4 Rg8 40.Ng4 Kg7 41.e5 Kf8 42.Rh2 Qf5 It appears 30...Rd3 is better than the less dramatic 30...Bf6, but not by a lot. |
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| Oct-05-08 | | Funicular: Rxd2 is quite obvious, being a rook down and involved in an all-out win-or-die kill-or-be-killed attacking pattern. And there arent much choices for white. Qxf3 as well. The key move is Qg2. THe occupation of g2 justifies losing a tempo. And then the knight coming into action seems natural. It's a nice combination, it's not easy OTB, but all moves since so natural...besides there's not much to do for black, given the circumstances. I'm proud i solved my first sunday puzzle with intuition rather than by knowing the game :P:P:P:P |
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| Oct-05-08 | | Funicular: In any case, as Kasparov explains in his book "how life imitates chess", it's easy to see a combination when you KNOW that there's a combination to be found. But OTB it takes huge b<beep!>s to play things like 30... Rd3!! |
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| Oct-05-08 | | ruinme: I know not all games end in mate, but maybe they should. My simple endgames lack the required technique, and I don't like studying them, so... I want to know what would happen if this was a blitz game and I had one minute to figure out that winning line...I like to see it all the way to the end. You guys have all seen those endgame books where it turns out black has a king move that turns the whole thing into a draw even when white has a pass pawn and a bishop against a knight... etc. |
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| Oct-05-08 | | ruinme: PS thanks for that line johnlspouge... how do you get those pics to show up of mini boards? |
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Oct-05-08
 | | al wazir: <ruinnme: 43...QXf1+ Yeah, wow. Giving up the Queen. Standing Ovation . . . 44...Qxf1+> Giving up the  again?? After the ovation, an encore. |
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Oct-05-08
 | | DarthStapler: I got the first three moves |
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Oct-05-08
| | johnlspouge: < <ruinme> wrote: PS thanks for that line johnlspouge... how do you get those pics to show up of mini boards?> Hi, <ruinme>. The Kibitzing Tricks can be found at the URL Kibitzing Tricks
and the subject ("mini boards") you want is under the heading HOW DO INCLUDE A CHESS POSITION IN MY MESSAGE?
Enjoy! |
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| Oct-05-08 | | wals: For the interested:
RYBKA (40 cores) won the World Computer Chess Championship 8/9.
HIARCS (4 cores) finished second 7/9.
The Swedish Chess Computer Association ranks Rybka at 3238! |
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Oct-05-08
 | | Once: <ruinme> There's a discussion of other ways to insert diagrams in the kibitzing to Korchnoi vs Spassky, 1977 |
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| Oct-05-08 | | Billy Vaughan: As usual for the 4-star puzzles, I didn't work out all the variations, which are usually over my head. But I saw the initial capture pretty easily. It's clear the knight is holding that important f3 square, so snap it off! Every recapture concedes something. |
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| Oct-05-08 | | Cactus: Don't ask me why, but I always get the Sunday puzzle (at least the first move) faster than the Wenesday puzzle. |
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| Oct-05-08 | | Helios727: In the final position, what happens after 44. Kd2 ? |
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| Oct-05-08 | | Manic: <Helios727> From earlier in the kibitzing....... <Athamas: I believe the following moves would go something like this...
44. Kd2 44. f3
45. Qe7 45. Kg6
46. Qd6 46. Bf6
Now the king can be put in check by the queen or bishop and the passed pawn becomes a queen for mate shortly. Correct me if I'm wrong, just what I see over the board.> Convincing to me, except that maybe 46...Kh5 is better than 46...Bf6 since the bishop is pinned in the latter. |
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| Oct-06-08 | | ruinme: For some reason, the possibilities of this endgame (if you can call it an endgame) really has me confused. When I looked at this part of johnlspouge i got confused... 9.Kd3 Nf3 40.Q moves Nh2 (threatening 40...f1=Q)Queen moves where?
and I remained confused when I looked at Jim from Providence's idea about a5! Kc4 because how does the Bishop e6 check give some punch to this already messy concoction? -Spinning. |
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Oct-06-08
 | | whiteshark: <Jimfromprovidence: <What's the end after <42.Kd3>? <I think you just found the insane part.>>> Wow! Yes, that seems to be the answer to my question. Thanks. |
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Oct-06-08
 | | kevin86: Black moves his pieces in like a white tornado.
(to remember the original Mr. Clean-who recently passed away). |
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Oct-24-08
 | | patzer2: For the October 6, 2008 puzzle, Black undermines the helpless White King position with 35...Rxd2+! In the final position, after 43...Nd4+!, White's two most likely replies are 44. Kd3 or 44. Kd2. If 44. Kd3, then 44...Qxf1+ 45. Rxf1 Bxf1+ 46. Kd2 Nf3+ 47. Kc1 Bg2  is winning. If 44. Kd2, then 44...Qg3! creates decisive threats. |
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sac: 30...Rd3