< Earlier Kibitzing · PAGE 3 OF 4 ·
|May-28-09|| ||randomsac: I'm not positive, but I think it all starts with
21 Rxg2...Kxg2 (else 22 Qxh2#)
I'm stuck but I think I'm on the right track. I guess I'll just have to look at someone else's analysis.
|May-28-09|| ||CHESSTTCAMPS: <remolino: After 21... Rxg2, 22. Kxg2: 22... Qh3 wins folks.>|
Agreed (I picked this line, too), but 22... Bh3+ is much simpler. Also, we both made a serious oversight in the line 23.Kg1 leading to the following position:
click for larger view
Each of us gave the flawed line 23...f3? 24.Bxf3 Qxf3, overlooking the defense 25.Qd1 and black's mating bind is gone! Black may still have the edge, but it's much more difficult.
From the diagrammed position, the simplest win is 23...Bd7 and the best white can do to delay mate is 24.Kh1 f3 25.Rg1 fxe2 26.Qb1 Qf3+ 27.Rg2 Bh3 etc.
This is another argument for not resigning until the opponent has shown his hand.
|May-28-09|| ||JG27Pyth: Ugh... calculation breakdown on the way to mate in 6. Just a couple too many extra-twigs on the branches. *disappointed*|
|May-28-09|| ||njchess: 21. ... Rxg2 is obvious to me. 31. ... Rxg2 22. Kxg2 Bh3+ (best) 23. Kh1 Rg8 traps White's king in a mating net. 24. Bf3 provides the stiffest resistance, but mate is inevitable. Time to check.|
As for the game, by 7. ... Nc6, we have an equal position typical of the Nimzo-Indian Saemisch. Black's developed knights and the fact that he has castled are offset by White's strong central pawns.
However, 8. Ne2 is an odd choice especially with Nf3 as an option. It's main fault is that it leaves open the e5 square for Black to occupy (which is desirable since his dark squared bishop is off the board). This allows Black a choice of playing either the immediate d5, or d6 followed by a later e5. The net affect is that Black gets to choose the pawn structure for the center, thereby nullifying White's main advantage in this position. I suspect that this move is part of a preferred, prepared sequence by White. However, Black neatly answers with a sound, subtle strategy.
9. e4 is a bit premature, though consistent with Ne2. While it does allow Bg5, but it otherwise does little to help White's position. 9. ... b6 is preferred over the more active cxd4, but since White is not pressing the issue, Black is in no hurry either.
11. ... e5 is played as per the above. 12. ... g5! accomplishes many things. It drives away the White bishop, it retains tempo for Black and it muzzles White's knight. Moreover, it is consistent with Black's theme of avoiding exchanging in the center.
By move 13, White is already starting to run out of decent moves. Qa4, Bc2 and d5 are his main options; none of which are that good. 13. d5 has the virtue of at least retaining tempo, but to what end?!? And while there aren't any particularly good moves at this point, 15. Nc1? is a definite mistake since it allows Black to play Nf4. h3 is a slightly better alternative.
21. Ra2?? is the final nail in the coffin. Up to this point, White's defense has been okay though not the most active. h3 followed by Qh5 instead of Kh1 are acceptable alternatives. Here, White should have played either Bf3 or Qd1.
|May-28-09|| ||Smothered Mate: deeper analysis of 21... Bh3
Hiarcs 12.1 d=22
(-6.32) 22. g3 fxg3 23. fxg3 Rxg3 24. hxg3 Qxg3 25. Bg4 Bxf1 26. Qd1 Rg8 27. Qxf1 Qxg4
|May-28-09|| ||kevin86: The solution is simple (for a Thursday). The t5heme is like yesterday's.The offered sac cannot be accepted nor declined-and there is no other choice.|
|May-28-09|| ||zooter: <njchess:>Excellent analysis...I really enjoyed it...I really don't understand 22.Ra2|
What is the need to defend the f2 pawn at the moment?
And look at white's final position. The queen and rook on the queenside play absolutely no part in the defence of the king and are mute spectators to the carnage created by <CG> members with multiple winning variations! :-)
|May-28-09|| ||Funicular: Really easy for a thursday.
As usual, the initial move is, while excellent, ather obvious..the key move is Bh3.
White´s completely lost after move 21. Obviously he overlooked the tactical vulnerability.
I´m guessing 21.Rg1 or Bf3 are O.K. for white. I like Bf3 better. Can´t figure out how Black can´t penetrate white´s castling.
Cheers from Buenos Aires
|May-28-09|| ||gofer: Having had a further look at this and read the many comments, I am now happy that the following line is not only the longest protaction for white possible, if black makes the best moves, but also has a very satisfying finish, with a queen sac...|
21 ... Rxg2, 22 Kxg2 Bh3+, 23 Kh1 Rg8, 24 Bg4 f3, 25 Rg1 Rxg4, 26 Rg3 Bg2+, 27 Kg1 Qxh2+! 28 Kxh2 Rh4+ mating!
|May-28-09|| ||YouRang: What can I say? 21...Rxg2 seemed to be screaming.
It cracks open white's king position and removes the defender of h3. Our LSB and Ra8, although on the other side of the board, are ready to quickly join the attack at h3 and g8, respectively. It's just a move you gotta look at.
Well, after 22.Kxg2, then 22...Bh3+ gets our bishop forcefully involved while clearing the path for our rook. I would expect 23.Kh1 (to avoid immediate check from the rook), but then 23...Rg8 anyway, threatening ...Bg2+ Kg1 and ...Bf3#.
- If white tries to guard the g-file: 24.Rg1 then 24...Rxg1+ 25.Kxg1 Qg5+ with ...Qg2# to follow.
- If white tries to make room at f1: 24.Rd1, then 24...Qxf2 looks like mate soon.
- Finally, if white, in desperation, tries to guard g2 with the bishop: 24.Bf3, then 24...Bxf1 25.Qd1 Qh3 and I see no defense against ...Bg2+ ~#.
|May-28-09|| ||doubledrooks: Got it, but after 21...Rxg2 22. Kxf2 Bh3+ 23. Kh1 I didn't see the idea of 23..Rg8 at first, so spent lots of time looking at 21...Bh3 and other moves, didn't like them, and finally saw 23...Rg8. |
One interesting line is 21...Rxg2 22. Kxg2 Bh3+ 23. Kh1 Rg8 24. Rf1 moves (to a1, b1, c1, or d1) Qxf2, with the threat of 25...Bg2#.
Now if 25. Bf3, then Qxf3+ 26. Rg2 Qxg2#
If 25. Bf1, then Qg1#
And if 25. Rg1, then Bg2+ 26. Rxg2 Qxg2#.
|May-28-09|| ||Kasputin: Like other puzzle's this week, the move 21. ...Rxg2 pretty much jumps out at me.|
22. Kxg2 is basically forced in order to prevent ...Qxh2#
22 ...Bh3+ which frees up the remaining rook
Now white can either play 23 a) Kf3 b) Kb1 or c) Kh1
a) 23. Kf3 Qg4#
b) 23. Kb1 Qg5+; 24. Bg4 Qxg4+; 25. Kh1 Qg2#
c) 23. Kh1 Rg8 (with the threat ...Bg2+ and then ...Bf3#)
c1) 24. Rg1 Rxg1+; 25. Kxg1 Qg5+; 26. Bg4+ Qxg4+; 27. Kh1 Qg2#
c2) 24. Bf3 Qg5 and now white cannot defend by moving the rook to g1 (black captures with the queen and that is mate). It also appears that there is no defence to the threat of ...Bg2+ - if black moves the king over to h1 then Bxf3 is mate and if white trades bishops then ...Qxg2 is also mate.
Time to check.
|May-28-09|| ||Patriot: 21...Rxg2 is an obvious try since it threatens mate via Qxh2#.|
Bh3+ made the most sense because it brings another piece into the fight with check, and prepares to bring the a8-rook into the fight as well.
I quickly ruled out anything else here. Kf3 is suicidal and Kg1 allows Rg8+, losing a tempo to play Kh1 anyway.
This threatens 24...Bg2+ 25.Kg1 Bf3#
I didn't look much further because I was convinced white is lost. I considered 24.Rg1, but 24...Rxg1+ 25.Kxg1 Qg5+ and mates on g2.
|May-28-09|| ||lzromeu: Easy. 21.Ra2 was clearly an error. 21.Bf3 or/and rg1, or g3 was needed to black improve a bad position.|
|May-28-09|| ||vmi: CHESSTTCAMPS: <remolino: After 21... Rxg2, 22. Kxg2: 22... Qh3 wins folks.>
Each of us gave the flawed line 23...f3? 24.Bxf3 Qxf3, overlooking the defense 25.Qd1 and black's mating bind is gone! |
Actually, instead of 24. ...Qxf3? 24. ...Bg4! is still winning shortly.
|May-28-09|| ||Kasputin: <c2) 24. Bf3 Qg5 and now white cannot defend by moving the rook to g1 (black captures with the queen and that is mate). It also appears that there is no defence to the threat of ...Bg2+ - if black moves the king over to h1 then Bxf3 is mate and if white trades bishops then ...Qxg2 is also mate.>|
Aside from a couple of forgivable typos, I didn't think about 25. Bg4 in this line. Looks like black can still force mate with either 25 ...Bxg4 or 25 ...Bg2+
It doesn't surprise me that many kibitzers saw Rxg2 off the bat. I am a little surprised that ...Bh3+ didn't come as a natural follow-up for everyone who found the initial move - even though there are other paths to the win, this just seemed pretty obvious to me.
Anyway, I came close, and I think otb I would have played the rook sac and would have won, but I can't say that I totally solved this from the initial position because I failed to think about 25. Bg4 in the crucial line. Yes it would be easy to find an answer to that move, but I think to really nail this (and I am speaking only for myself) I should have seen and thought about all white responses. Afterall, from the initial puzzle position this is a forced mate with best play on both sides.
|May-28-09|| ||SuperPatzer77: After 22...Bh3+!, White's best move is 23. Kg1 below:|
23...Rg8!, 24. Bg4!? Bxg4! (threatening 25...Bf3#) 25. f3 Bxf3+! 26. Rxf3 (26. Rg2 Rxg2! mating in next move) Qe1+ (mates in next move)
23...Rg8! 24. Bf3 Bxf1!, 25. Qd1 Qh3 (with idea of 26...Bg2+), 26. Ra1 Bg2+, 27. Bxg2 Qxg2#
|May-28-09|| ||lzromeu: correction:
... to white improve a bad position
|May-28-09|| ||YouRang: <gofer: Having had a further look at this and read the many comments, I am now happy that the following line is not only the longest protaction for white possible, if black makes the best moves, but also has a very satisfying finish, with a queen sac...
21 ... Rxg2, 22 Kxg2 Bh3+, 23 Kh1 Rg8, 24 Bg4 f3, 25 Rg1 Rxg4, 26 Rg3 Bg2+, 27 Kg1 Qxh2+! 28 Kxh2 Rh4+ mating!>
As <Kasputin> points out, 24...Bxf4 looks like the immediate winning shot in this case. White has no good way to stop the threat of 25...Bf3#.
|May-28-09|| ||megatacos: rxg2, after kxg2, f3, if kxf3, qh3#, if bxh3, qh3, kg1, qxf3, force mate in 2|
|May-28-09|| ||megatacos: actually, bh3, kh1, bg2, kg2, rg8, kh1, qh3, rg1, f3, rg8, kg8, bf3, qf1#|
|May-28-09|| ||Edeltalent: When I solved this, I was really sorry to see 21... Rxg2 22.Kxg2 Bh3+ 23.Kh1 Rg8 24.Bf3 Qh5 being repelled by 25.Qd1.
What a pity! This would have been way more beautiful than the rather prosaic 24... Qg5.|
|May-28-09|| ||SuperPatzer77: <YouRang> Hey, yourself! |
<As <Kasputin> points out, 24...Bxf4 looks like the immediate winning shot in this case. White has no good way to stop the threat of 25...Bf3#.>
You've made a typo of 24...Bxf4. The correct one is 24...Bxg4.
<YouRang> don't worry about making a typo. You're awfully human. So are we. You're absolutely right about your commentary.
|May-28-09|| ||ruzon: Here are my deep thoughts:
21...<xg2> threatens mate and is therefore forcing.
21...xg2 <22.xg2> h3+ 23.h1 g8 seems too slow, allowing 24.f3 or 24.g1 (***).
21...xg2 22.xg2 h3+ 23.h1 <xf1> 24.xf1 g8 25.f3 and mate on g2 is blocked. Fie on materialism!
21...xg2 22.xg2 <f3+> 23.xf3 f4+ 24.g2 xe4+ 25.g1 and Black can't reload before 26.f3 slows down the attack. White must not be allowed to move the pawn to f3.
21...xg2 22.xg2 <h3+> 23.h1 f3 <24.xf3?> xf3+ 25.g1 h3 with mate next move.
21...xg2 22.xg2 h3+ 23.h1 f3 <24.g1> fxe2 25.aa1 f3+ 26.g2 h3 27.ag1 g8 with mate in two, and if not 25.a1...
21...xg2 22.xg2 h3+ 23.h1 f3 24.g1 fxe2 <25.xe2> f3+ 26.g2 h3 with mate in one.
15+ minutes later, I'm ready to check.
(***) I did not see the value of getting a Rook to the g-file before White does. I got off the right track but it seems not far off enough to lose.
|May-28-09|| ||SuperPatzer77: <ruzon: Here are my deep thoughts: |
21...<Rxg2> threatens mate and is therefore forcing.
21...Rxg2 <22.Kxg2> Bh3+ 23.Kh1 Rg8 seems too slow, allowing 24. Bf3 or 24. Rg1 (***).>
24. Rg1 Rxg1+, 25. Kxg1 Qg5+, 26. Bg4 Qxg4+ (mating in next move).
24. Bf3 Bxf1!, 25. Qd1 Qh3! (forcing mate)
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