< Earlier Kibitzing · PAGE 2 OF 2 ·
|Sep-26-10|| ||Eduardo Leon: <Phony Benoni>, I missed 27...♔g7!, you are right.|
|Sep-26-10|| ||al wazir: As usual, <dzechiel> is right on the money, down to and including <perhaps too easy for a typical Sunday>. (I got the first three moves, the best I've done since midweek.)|
|Sep-26-10|| ||TheoNov: My analysis with help from Rybka:
a) The "normal-looking" 6.b3? is actually a significant mistake. Best is 6.d5!
b) Mainly as a result of a), White is lost by move 15.
c) 18...Qxe3! leads to a forced mate in 11 moves, but...
d) Not with 21...Rc6??, as this allows White to escape with near-equality (with 28.g4!, as P.Benoni suggested).
e) The good move is... 21...Rc5!, and this leads to mate in 8: 22.Ne4 Bc8+ 23.Kg5 h6+ 24.Kh4 g5+ 25.Nxg5 hxg5+ 26.Kxg5 e4+ 27.Kf4 Nh5+ 28.Kxe4 f5+ 29.Kd3 Bf2#
|Sep-26-10|| ||LIFE Master AJ: Some analysis of this game:
Agdamus,Jose Luis - Rubinetti,Jorge Alberto [E15]
Buenos Aires (R#3) / 21,07,1970.
1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Ba6 5.Qc2 c5 6.b3 Nc6 7.Bb2 cxd4 8.Nxd4 Bb4+ 9.Nd2 Nxd4 10.Bxd4 Bb7 11.f3 d5 12.cxd5 Qxd5 13.Qb2 Rc8 14.Rd1 0-0 15.Bh3 Rfd8 16.Be3 Bc3 17.Qb1 Qe5 18.Kf2?!,
click for larger view
[Better was: 18.Bf4 Qd4 19.Kf1 Nh5 ]
18...Qxe3+!!; 19.Kxe3 Bd4+; 20.Kf4▢,
This was forced.
[Worse was: </= 20.Kd3 Bf2#]
20...e5+ 21.Kf5 Rc6!?;
This was NOT the best!
[Houdini discovers a better try: 21...Rc5!; 22.Ne4 Bc8+; 23.Kg5 h6+; 24.Kh4 g5+; 25.Nxg5 hxg5+; 26.Kxg5 e4+; 27.Kf4 Nh5+; 28.Kxe4 f5+; 29.Kd3 Bf2#]
22.Ne4 Bc8+; 23.Kg5 h6+; 24.Kh4 g5+; 25.Nxg5 hxg5+; 26.Kxg5 Nh7+; 27.Kh5 Bxh3; 28.e3 Rdd6; White resigns. 0-1
|Sep-26-10|| ||stukkenjager: "It will be interesting to see the returns from Silicon Valley:" I also saw Qxe3+ as a candidatemove. It took a full 15 sec to work out the forced checkmate:|
18...Qxe3+ 19.Kxe3 Bd4+ 20.Kf4 e5+ 21.Kf5 (21.Kg5 h6+ 22.Kf5 (22.Kh4 g5#) 22...Bd5 23.Qd3 Be6#) 21...Rc5 22.Ne4 Bc8+ 23.Kg5 h6+ 24.Kh4 g5+ 25.Nxg5 hxg5+ 26.Kxg5 e4+ 27.Kf4 Nh5+ 28.Kxe4 f5+ 29.Bxf5 (29.Kd3 Bf2#) 29...Bxf5# 0-1
|Sep-26-10|| ||LIFE Master AJ: <Sep-26-10 stukkenjager: "It will be interesting to see the returns from Silicon Valley:" I also saw Qxe3+ as a candidatemove. It took a full 15 sec to work out the forced checkmate:> |
If this is really true, you are at least a 2600+ GM.
|Sep-26-10|| ||VincentL: "Insane".
After looking for immediate sacrifices to open up the position, I don't see anything.
I considered 18.... Nd5 (threatening Qe3+), but it doesn't make progress.
So it must be 18 . Bxd2 or Rxd2. Of these I prefer 18. Bxd2 (threatening Qe3)
Then after 19. Bxd2 I think it may be 19..... Ne4+ 20. fxe4 Be4 and white´s queen
I am guessing I am on the right lines here; low let´s look at other options for white.
He could decline the knight and play 20. Ke1. Here I don't see the way forward.
It´s late and I am going to have to check the game to see what happened.
|Sep-26-10|| ||M.Hassan: "Insane" Black to move 18...?
I think Queen sac is the initial move!
19.Kxe3 Bd4+ this check brings the King out of safety.
King has the following moves:
21.Ke4 will cause another check forking the Queen and White q will be lost
If 21.g4 Ne3+
If 21.Kg5 h6+
And what if White does not accept Queen sacrifice:
Black is significantly stronger and wins
Time to check
I don't know whether I'm mistaken or what that I like my line better!
|Sep-26-10|| ||VincentL: Way off the mark again.
In the game line I think perhaps 22. f4 offers a token more resistance. But black can in any case capture white´s bishop on h3 if a forced mate is not possible in a few moves
|Sep-26-10|| ||sfm: <TheoNov: ... 28.g4 ) Thanks for that! I could not find a good response to 24.g4, and wondered if I'd overlooked something simple.
So 21.-,Rc6 is a ??
How difficult this game is...
|Sep-26-10|| ||TheBish: Agdamus vs J A Rubinetti, 1970|
Black to play (18...?) "Insane"
I was sure about the first move after less than a minute's thought... the tricky part was the follow-up!
A classic diversionary sacrifice of queen for bishop, which reminds me of a famous game where Tigran Petrosian sacrificed his queen for bishop to divert the enemy king into a mating net.
Forced, or Black just wins easily.
19...Bd4+ 20. Kf4 e5+
Here's where I got stuck for awhile, looking at alternatives that didn't work, such as 20...Rc5 and 20...g5+ 21. Kxg5 Rc5+. Now:
A) 21. Kf5 Rc6! (a double purpose move which both protects the Nf6 and clears c8 for the bishop) 22. Ne4 Bc8+ 23. Kg5 h6+ 24. Kh4 g5+ 25. Nxg5 hxg5+ 26. Kxg5 Nh7+ 27. Kh5 Bxh3 (three pieces for the queen now, and the attack continues) 28. e3 Rdd6! 29. Qxh7+ Kxh7 30. exd4 Rh6+ 31. Kg5 Rcg6#.
B) 21. Kg5 h6+ 22. Kf5 (or 22. Kh4 g5#) Rc6 (or even 22...Rd6) followed by either 23...g6# or 23...Bc8#.
A pretty deep combination... I found the first move right away, but I'm not sure I would be able to find the best follow-up in a tournament game with the clock ticking -- a good reason to stay out of time pressure!
|Sep-26-10|| ||C4gambit: What about 20...Nd5+ for black?|
|Sep-26-10|| ||hedgeh0g: Found the (fairly obvious) queen sac, but can't give myself credit for solving the puzzle since I missed the crucial 21...Rc6. I tried to make something work by playing ...g6, saccing the knight and checking along the rank with a rook, but the knight proves crucial to preventing the white king's escape in all variations, it seems.|
I think I'd play this over the board if I was ever able to spot the queen sac, even if I couldn't calculate it to the end, since, despite the lack of a queen, the mass of black material combined with the exposed white king should yield at least decisive material gain for the attacking side, especially as more moves are played, bringing the decisive blows closer to the "calculation horizon".
Not to mention it would be a spectacular way to win a game! :D
|Sep-26-10|| ||rapidcitychess: Fairly easy for a Sunday puzzle.|
|Sep-26-10|| ||scormus: First 3 move not so difficult to find, but I honestly couldnt see it much further, and nowhere near to the end.|
<Awaiting the report from Si Valley> if there's any justice the Q-sac is completely sound. I think it is but it would be nice to know for certain ..... but perhaps only with 21 ... Rc5 <5hrsolver, I think its you meant>.
Game sequence ... <PhoneyBenoni> likewise, I couldnt see what B would do after 28 g4. I dont understand why W played 28 e3 instead of g4. Was he groggy because of all those shots B dished out, or am I blind?
|Sep-26-10|| ||goldenbear: I must admit I would have played 21.Rc5, so I missed this one completely (which is unusual, as I tend to get Sundays better than I do Thursdays).|
|Sep-26-10|| ||tinchoracing: The first moves were easy to find, but I couldn't work out the king hunt completely.|
|Sep-26-10|| ||thegoodanarchist: To me the key to the entire combination is Black's 21st move, ...Rc6.|
This is really a cold-blooded move because it is not a check. Now White has the move and can do something other than run his king.
However, not only does 21...Rc6 clear the c8 square for the murderous LSB to come into the attack, but it also foreshadows the doubling of Black's rooks on the 6th rank.
This future doubling on the rank is what seals White's doom.
|Sep-26-10|| ||scormus: <goldenbear .... missed completely> Not at all! You found a better line than was played <TheoNov's technical note>|
Looking at it some more, I can understand the choice 21 ... Rc6. The double-R manouver looks unstoppable.
|Sep-26-10|| ||BOSTER: I don't know how and under what circumstance but black has excellent development. Two black rooks have open files "c" and "d", black Queen in the center of the board. In such positions it is good idea to invite white King into black camp.
So,18...Qxe3 19.Kxe3, who wants to step back and play without two pieces.
19... Bd4+ 20. Kf4 e5+ 21.Kf5 (if Kg5 21...h6+). And now when white King crossed the equator and black King said "Hi", I'd move rook c8 to give c8 square for bishop. Where to move rook you can ask <dzechiel>- this is <Once> patent.
If white play g4 don't forget answer h6, if Kg5 h6+, Kh4 g5#.|
|Sep-26-10|| ||Fusilli: I don't know if this puzzle was "insane", but I would say it is an insanely beautiful queen sac.|
|Sep-26-10|| ||agb2002: The material is even.
White would release some pressure with 19.Nc4.
Black can extract the white king with 18... Qxe3+ 19.Kxe3 Bd4+ 20.Kf4 (20.Kd3 20.Bf2#) g5+ 21.Kxg5 Rc5+:
A) 22.Kh4(6) Rh5#.
B) 22.Bf5 Rxf5+ 23.Qxf5 exf5 and Black seems to have the better endgame because the bishop pair can be very dangerous against and exposed king.
C) 22.Kf4 Nd5+
C.1) 23.Ke4 Nc3+
C.1.a) 24.Kd3 Nxb1 25.e4 (25.Nxb1 Bf2#) Nxd2 - + [B vs P].
C.1.b) 24.Kf4 Nxe2+ 25.Kg4 h5+ 26.Kh4 Bf6#.
C.2) 23.Kg5 Bf6+
C.2.a) 24.Kh6 Bg7+ 25.Kg5 (25.Kh5 Nf6+ 26.Kh4 Rh5#) Ne3+ 26.Bf5 (26.Kf4 Bh6#) Rxf5+ 27.Qxf5 (27.Kh4 Bf6#) exf5 followed by 28... Nxd1 or 28... Rxd2.
C.2.b) 24.Kh5 Nf4+ 25.Kg4 h5+ 26.Kxf4 Bg5#.
C.2.c) 24.Kg4 Ne3+ 25.Kf4 Bg5#.
C.3) 23.Kg4 h5+ (23... Nf6+ repeats positions)
C.3.a) 24.Kxh5 Nf6+ 25.Kh4(6) Rh5#.
C.3.b) 24.Kg5 Nc3+ 25.Bf5 (25.Kf4 Nxe2#; 25.Kh4 Bf6#; 25.Kh6 Bg7#) Nxb1 26.Nxb1 Rxf5+ 27.Kh4 Bf6+ 28.Kh3 Rfd5 - + [2B vs N+P].
C.3.c) 24.Kh4 Bf6+ 25.Kxh5 Ne3+ 26.Bf5 (26.Kh6 Bg7#) Rxf5+ is similar to C.2.a.
|Sep-26-10|| ||agb2002: I saw 20... e5+ but had the impression that a timely sacrifice of White's LSB or queen would allow the king escape.|
|Sep-26-10|| ||wals: Insane is right as the analysis by Rybka 4x64 highlights the blunders.|
White: depth 16:4 min:
1. (-2.38): 15.a3 Bxa3 16.Qxa3 Qxd4 17.Qa4 Qc5 18.Qc4 Qe7 19.Qa4 Rfd8 20.e4 Qc5 21.Qc4 Qd6 22.Qe2 Rc2 23.e5 Qb4 24.Bg2 Nd5 25.Qd3 Rc3 26.Qe2 Ne3 27.Rb1
1. (-4.39): 18.Bf4 Qc5 19.b4 Bxb4 20.Kf1 Qc2 21.Qxc2 Rxc2 22.Kf2 Bxd2 23.Bxd2 Rdxd2 24.Rxd2 Rxd2 25.Ra1 Nd5 26.a3 Nc3 27.Bf1 Rc2 28.a4 Ba6 29.a5 bxa5 30.Rxa5 Bxe2 31.Rxa7 Nd1+
Black: depth 14: 3 min:
1. (-#9): 21...Rc5 22.Ne4 Bc8+ 23.Kg5 h6+ 24.Kh4 g5+ 25.Nxg5 hxg5+ 26.Kxg5 e4+ 27.Kf4 Nh5+ 28.Kxe4 f5+ 29.Bxf5 Bxf5#
2. (-#14): 21...Rc4 22.Ne4 Bc8+ 23.Kg5 Be3+ 24.f4 h6+ 25.Kh4 g5+ 26.Nxg5 Rxf4+ 27.Bg4 hxg5+ 28.Kh3 Bxg4+ 29.Kg2 Rf2+ 30.Kg1 Rxd1+ 31.Qxd1 Bh3 32.Qd8+ Kh7 33.Qh8+ Kxh8 34.b4 Rxe2#
White: depth 18: time 5 min:
1. (-1.80): 27.Qxh7+ Kxh7 28.Bxc8 Rdxc8 29.Rd3 Rc2 30.e3
Black: depth 18: 3 min:
1. (-3.76): 27...Rg6 28.Qxg6+ fxg6+
2. (-2.66): 27...Kg7 28.Qxh7+ Kxh7 29.Bxc8 Rdxc8 30.Kg4 Rc2
White: depth: 17: 8 min:
1. = (0.00): 28.g4 Re8 29.Rc1 Rg6 30.Kh4 Bg2 31.Kg3 Bxh1 32.Rxh1 Nf6 33.Qf5 Nd5 34.Qd7 Nf6 35.Qf5 Nd5 36.Qd7 Nf6 37.Qf5 Nd5 38.Qd7 Nf6 39.Qf5 Nd5 40.Qd7 Nf6 41.Qf5 Nd5 42.Qd7 Nf6 43.Qf5
White called quits after 29...Rdd6.
Played out the game may have went:-
1. (-#10): 29.Qxh7+ Kxh7 30.g4 Rh6+ 31.Kg5 Rcf6 32.Rxd4 exd4 33.Rf1 dxe3 34.a4 e2 35.Rc1 Rxf3 36.Rc7 Rg6+ 37.Kh5 Bxg4+ 38.Kh4 e1Q#
2. (-#2): 29.Qg6+ Rxg6 30.exd4 Rh6#
|Sep-26-10|| ||patzer2: For today's difficult Sunday puzzle solution, 18...Qxe3+!! offers up the Queen as a (sham) sacrifice to initiate a decisive pursuit (King hunt) combination.|
Here's a breakout with Fritz 10:
<18...Qxe3+!! 19. Kxe3 Bd4+ 20. Kf4>
The combination is forced to this point. If 20. Ke5+, then it's 20...Bf2# or 20...Rc3#.
<20...e5+> Fritz gives this as best.
However, also winning is
20... Rc5! (this was my choice, though I didn't see it through all the way to the end) 21. Ne4
[21. g4 Bf2 22. Ne4 (22. g5 e5+ 23. Kf5 Bc8#) 22... e5+! 23. Kf5 (23. Kg5 h6+ 24. Kf5 Bc8+ 25. Rd7 Bxd7#) 23... Bc8+ 24. Rd7 Bxd7+ 25.Kg5 h6#]
21... e5+! 22. Kg5 h6+ 23. Kh4 (23. Kf5 Bc8#) 23... Bxe4! 24. Bf5 Bxb1 with a decisive piece advantage.
<21. Kf5> This puts up the most resistance.
If 21. Kg5, then it's mate-in-three with 21...h6+ 22. Kf5 Bd5! 23. f4 (or any other move) and 23...Be6#.
<21...Rc6> This is an excellent practical idea, but it's not the best move.
Much stronger is 21... Rc5! with a pretty forced mate-in-eight after 22. Ne4
[22. b4 Bc8+ 23. Kg5 h6+ 24. Kh4 g5#]
22... Bc8+ 23. Kg5 h6+ 24. Kh4 g5+! 25. Nxg5 hxg5+ 26. Kxg5 e4+ 27. Kf4 Nh5+ 28. Kxe4 f5+ 29. Bxf5 Bxf5#.
<22. Ne4 Bc8+ 23. Kg5 h6+ 24. Kh4 g5+ 25. Nxg5 hxg5+ 26. Kxg5 Nh7+ 27. Kh5 Bxh3!?>
It's hard to criticize Black's 27th move, especially OTB and under time pressure, but it gives White a chance to get back into the game.
Much stronger, and still winning, is 27... Rg6!, when play might continue 28. Qxg6+ fxg6+ 29. Kxg6 Rd6+ 30. Kh5 Bxh3 31. g4 Kg7 32. Kh4 Bg2 33. Rxd4 exd4 34. Re1 d3 35. Kg3 d2 36. Rd1 Bf1 37. Kf2 Bh3 38. Kg3 Ng5 39. f4 Ne4+ 40. Kf3 Nc3 .
<28. e3?> White misses his last chance with 28. g4! when he has survival chances after 28...Bg2 29. g5 Bxh1 30. Rxh1 Kg7 31. h4 .
<28... Rdd6 0-1> This forces White's resignation, since he must give up decisive material (i.e. the Queen) to delay the threatened 29...Rh6#.
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