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|Jun-27-09|| ||eblunt: IMO the text is a blunder. 22 ..... Rb8 and after 23. Bb3 white is propably winning the e6 pawn, with a clear advantage but black could fight on.|
|Jun-27-09|| ||David2009: I proposed 19 b4 for the same reasons as <dzechiel>. His analysis says it all. No doubt 19 b4 wins, but as dzechiel says <Not nearly as good as the game, and certainly not as forced>.|
|Jun-27-09|| ||David2009: <eblunt: IMO the text is a blunder. 22 ..... Rb8 > 23 Qf6+ Kg8 24 Rd3 forces mate, surely?|
|Jun-27-09|| ||Whitehat1963: I got the first three moves, but there was no way I came close to seeing 22. Qe7.|
|Jun-27-09|| ||eblunt: <David2009: <eblunt: IMO the text is a blunder. 22 ..... Rb8 > 23 Qf6+ Kg8 24 Rd3 forces mate, surely?>|
Yes, you're right, forgot that the black rook needs to stay on the d-file to prevent the rook lift
|Jun-27-09|| ||butilikefur: <19. b4 Qa6> (19...Qxb4 20. Rb1 Rxd1+ 21. Qxd1 Qxc5 22. Bd6 [or 22. Bxf6 gxf6 23. Rxb7] 22...Rd8 23. Bxc5 Rxd1+ 24. Rxd1)|
<20. Bd3 Qa4> (20...Qa3 21. Bb2 Qa4 transposes to the main line)
<21. Bxf6 gxf6 22. Bc2 Qa3 23. Qh5 Rxd1+ 24. Rxd1 f5 25. Qg5+ Kh8 26. Qf6+> (26. Rd3 Qb2 [26...f6 27. Qh6 Rg8 28. Rd7 mates] and Black regains control)
<26...Kg8 27. Rd3 Qc1+ 28. Bd1 f4 29. h4 f3> (29...Ba6 30. Rd4 Qc3 [30...Be2 31. Qg5+ Kh8 32. Qe5+ Kg8 33. Qxe2] 31. Qxf4 f5 [31...Qe1+ 32. Kh2 e5 33. Qg5+ Kh8 34. Qf6+ Kg8 35. Rg4+ mate] 32. Qe5 threatening Rg4+ and Qxe6+)
<30. h5 h6 31. Rxf3 Qxd1+ 32. Kh2 Qxf3 33. Qxf3 Re8 34. Qg3+ Kf8 35. Qd6+ Re7 36. Qd8+ Re8 37. Qf6> (36. b5 cxb5 37. c6 Bc8 38. Qd8+ Re8 39. Qf6 might be stronger)
|Jun-27-09|| ||Once: A very well played attack. Nothing too flashy - just simple forceful moves.|
I went a slightly different way, but I still think it works:
19. Bxf6 gf 20. Qh5 (a crude mate threat) 20...f5 (mutual rook exchanges on d1 don't affect the line) 21. Qg5+ Kh8 22. Qe7. Now Qxb7 and b4 are both threatened.
|Jun-27-09|| ||jsheedy: After 10 minutes all I see is a draw with 19. Bxf6, gxf6, 20. Bxh7+, Kxh7, 21. Qh5+, Kg8, 22. Qg4+, Kh8, 23. Qh5+, etc. Time to check.|
|Jun-27-09|| ||WhiteRook48: all I saw was 19 Bxf6 gxf6 20 Bxh7+ Kxh7 21 Qh5+ =|
|Jun-27-09|| ||remolino: Let's see how I did today; it seems that they key moves will be:|
b4 (to deflect Q from protection of rook), Bxf6, possibly Bxh7, Qh5, etc., question is order of moves.
19.b4!, Black must take the R on d1 at some point, otherwise:
19... Qxb4, 20.Bxf6 gxf6, 21.Qh5 f5, 22. Rxd8 etc.
19.b4! Rxd1+, 20. Rxd1 Qxb4, 21 Bxf6 gxf6 22. Qh5 f5, 23. Qg5 Kh8, 24. Qf6+ Kg8, 26. Rd3 ( )
Time to check
|Jun-27-09|| ||D4n: This one is pretty simple and to the point. Force a weakness and carry on from there. Bxf6 does very nicely at that.|
|Jun-27-09|| ||johnlspouge: Saturday (Very Difficult)
Gruenfeld vs J Schenkein, 1915 (19.?)
White to play and win.
Material: B for N. The Black Kg8 has 1 legal move. White has Bc2 and Be5 on adjacent diagonals raking the Black K-position. The White Qe2 can generate mate threats at d3, e4, or h5, suggesting Bxf6 to destroy Nf6, which defends Ph7. The White Rd1 faces Rd8, creating tactical tension. The Black Qa5 and Bb7 are loose, and Bb7 is out of play. Black threatens 19…Qxc5. The White Kg1 is vulnerable to a back-rank mate, but Black has only (presently harmless) back-rank checks by Qa5 or Rd8.
Candidates (19.): Bxf6, Bd6, Rd3, Rxd8, b4
19.b4 (forcing Qa5 away from contact with d8)
(1) 19…Rxd1+ 20.Rxd1
20…Ba6 [Qxb4 21.Rab1 wins Bb7] [Qa3 transposes the following]
21.Qd2 Qa3 [Qxa2 22.Bxh7+] 22.Bxf6 gxf6
23.Qh6 (threatening 24.Qxh7#)
24…f5 [23…R moves 24.Bxh7+ Kh8 25.Bg6+ Kg8 26.Qh7+ Kf8 27.Qxf7#]
25.Rd4 (threatening 26.Rg5+ fxg5, then mate as on move 23.)
Black must drop material to prevent immediate mate.
(2) 19…Ba6 [Qxb4 20.Rab1 wins Bb7] [Qa3 transposes the following]
Throughout Variation 2, …Rxd1+ Rxd1 just transposes into Variation 1.
20.Qf3 Qxb4 [or Qa3] 21.Bxf6 gxf6 [else, drop Nf6]
22.Qh5 (threatening mate as on move 23. of Variation 1)
22…f5 23.Qg5+ Kh8 24.Rxd8
Black drops a R.
I have no computer, but my variations look alright to me. They are not as surgical as 22.Qe7. My preliminary analysis noted all the tactical themes (including the loose Bb7), but I did not put them all together correctly 8>O
|Jun-27-09|| ||Once: <johnlspouge: I have no computer...>|
In that case, sir, I am as impressed by your analysis as I am by your ability to post anything on the internet! ;-)
|Jun-27-09|| ||kevin86: I thought we were heading for checkmate,but instead,the final move was to divert the queen on the opposite end of the board.|
|Jun-27-09|| ||Jimfromprovidence: The difference between playing 19 b4 vs. the text 19 Bxf6 is that it appears the former wins an exchange with best play while the latter wins a full piece.|
If 19 b4 Qb5 20 Bd3, black can play 20…Rxd3. Now, after 21 Qxd3 (not Rxd3 because of 21…Ba6) 21…Qxd3 22 Rxd3, white is up an exchange.
click for larger view
In the text, instead of 22…Bc8, better is 22…Rxd1+. Now, after 23 Rxd1 Kg7 24 Qxb7, white is up a full piece.
click for larger view
|Jun-27-09|| ||TheChessGuy: Just a clear, clean attack from Herr Grunfeld. It's important to remember that attacks don't always have to be complicated.|
|Jun-27-09|| ||hedgeh0g: I was looking at Bxf6 gxf6 Bxh7+ Kxh7 Qh5+, followed by a rook lift, but obviously the rook lift wouldn't work because the rook would just get snapped up on the d-file.|
|Jun-27-09|| ||TheBish: Gruenfeld vs J Schenkein, 1915|
White to play (19.?) "Very Difficult"
Material is even.
Candidate moves: Bxf6, b4
After 19. Bxf6 gxf6 20. Qg4+ Kh8 21. Qh4 f5, White wins by combining threats with 22. Qe7!, threatening both 23. Qxb7 and 23. b4, driving the queen from its defense of d8. There is no defense:
A) 22...Rxd1+ 23. Rxd1 Rb8 24. Qxf7, followed by either 25. Qf6+ and 26. Qxe6+, or 25. h4 (luft) and 26. Rd7, and the end is near.
B) 22...Ba6 (or Bc8) 23. b4! and now 23...Rxd1+ (23...Rfe8 24. Qf6+ Kg8 25. bxa5) 24. Rxd1 and Black's queen is unable to protect the rook.
C) 22...Rb8 23. Qf6+ Kg8 24. Rd3 Rfd8 (or 24...f4 25. Rh3 Rfd8 26. Rxh7 followed by mate) 25. Rg3+ Kf8 26. Rg7 Qc7 (or 26...Rd7 27. Rxh7 followed by Rh8#) 27. Rxh7 Ke8 28. Rh8+ Kd7 29. Rd1+ Kc8 30. R(any)xd8+ Qxd8 31. Qxd8 mate.
My first impression was that this was much more difficult, and that maybe White would have to play 19. b4 first for some reason (leading to more options for Black, like 19...Ba6 20. Bxh7+ Kh8 21. Bd3), but the direct attack works nicely here. I thought that White would need to drive the queen away from c7 first by 19. b4, but with 22. Qe7! the tempo on the bishop achieves the objective nicely without any great complications.
|Jun-27-09|| ||MaczynskiPratten: MaczynskiPratten: 22..Bc8 loses a Rook. 22..Rb8 gets mated after 23 Rd3. 22..Rxd1+ 23 Rxd1 Rb8 avoids both. White cannot follow up with 24 Rd3 (or Rd7) because of Qe1#! However, Black likewise is totally tied up because his Q must stay on the a5-e1 diagonal to maintain this threat, e.g. after 24 Qxf7, Qxc5 loses to 25 Rd7. So 24..Ba6 and now, as <TheBish> points out, White has time to make space with 25 h4 before Rd7. Or he can mop up a couple of pawns with 25 Qf6+ Kg8 26 Qxe6+ Kh8 (or Kf8) 27 Qxf5, exploiting the fact that Black's K can't move away from the back rank because Rd7 is then check.|
I spotted the Bxf6/Qg4-h4/b4 tactic but missed 22 Qe7!, hence I thought I had to play 19 b4 so that the Bishop could stop Qc7. Close, but no cigar.
|Jun-27-09|| ||butilikefur: Hey <Jim from Providence>, I certainly didn't see the variations leading to your second diagram but in actual play White might prefer to have queens off the board. If <19. b4 Qb5 20. Bd3 Rxd3 21. Qxd3 Qxd3 22. Rxd3> then Black may play:|
<22...Ng4> (22...Ba6 23. Ra3 Bb5 24. Bxf6 gxf6 25. Rxa7 followed by 26. a4 is too easy.
22...a6 23. Bxf6 gxf6 24. Rd7 Rb8 25. Rad1 and Black must exchange rooks and end up giving up his queenside pawns [for example, 25...Kg7 26. Rd8 Rxd8 27. Rxd8 a5 28. Rb8 Ba6 29. Rb6 Bb5 30. Rxb5 cxb5 31. bxa5].
22...Ne4 23. Rd7 Bc8 24. Rxa7 and the plan of Bd6 and a4 is unstoppable)
<23. Bxg7 Kxg7 24. Rg3 h5 25. h3 f5 26. hxg4 fxg4> (26...hxg4 27. f3 Re8 28. fxg4 f4 29. Rf3 e5 30. Rd1 Ba6 [30...Kf6 31. Rd6+ Kg5 32. Rd7 Bc8 33. Rg7+ Kf6 34. Rxa7 Bxg4 35. Rc7 should be winning - for example, 35...Bxf3, this is poor as Black should keep the bishop, 36. gxf3 Re6 37. a4] 31. Rd7+ Kg8 32. Rxa7 Bc4 33. Rh3 e4 34. Rh7 and 34...e3 loses to 35. Rag7+ Kf8 36. Rh8+ Kxg7 37. Rxe8 Bd3 38. Rd8 Ba6 39. Rd4 e2 40. Kf2)
<27. Ra3> (27. Rd1 [27. f3 Rf4 28. a3 a5] 27...Kf7 [27...Rf6 28. Rd5 Rh6 29. f3 wins the pawn] 28. Re5 Rh8 29. f3 Kf6 30. Rd3 Rg8 [gxf3 31. Rgxf3+ Ke7 32. Re5 h4 33. Rg4 is winning - not 33. Rh3 Kf6 34. Re4 Kg5] 31. Ra3 a6 32. Rb3 followed by Rb6 wins White a pawn but there is still work involved)
<27...Ra8 28. Rd1 Bc8 29. Rd6> is winning (the b4 pawn is in no danger as the White rook takes a7 with check).
|Jun-27-09|| ||CHESSTTCAMPS: Nice. I was focused on 19.b4 first. I looked at 19.Bxf6, but missed the Qe7 idea.|
|Jun-28-09|| ||5hrsolver: this is an amazing problem. The whole point is to prevent black from playing the queen to c7 once white plays 23.b4.|
|Jul-02-09|| ||patzer2: For the Saturday, June 27, 2009 puzzle solution, 19. Bxf6! opens up a winning attack on the weakened castled position.|
The final blow 23. b4! is a good example of an attack on the overworked piece. In this case, the Black Queen cannot defend both herself and her threatened rooks. If 23...Rxd1, then 24. Rxd1 leaves both the decisive double threat of 25. bxa5 snaring the Queen or 24...Qxb4?? 25. Qxd8#.
|Aug-02-10|| ||sisyphus: My friend Fritz says Black is clearly worse after 15.Bd6. In Logical Chess: Move by Move, Chernev says|
<The alternative 15....Q-B1, moving the Queen out of the Bishop's range, does not look appetizing. With the text, Black prevents the Knight from leaving and uncovering an attack.>
But after 15...Qc8, what has White got?
|Feb-08-20|| ||AliSawalha: 22. Qf6+ Kg8 23. Re1 Qxc5 24. Re3|
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