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Dec-04-10
 | | Phony Benoni: Sort of had the idea, but I got focused on 20.Nfxe6 fxe6 21.Qe2, or 20...Bxe6 21.Nxe6 Bxe3 22.Rxd8+. However, Black of course interpolates 21..Qxd1+ in that second line: 22.Rxd1 Bxe3 23.Rd8+ Ke7, and White will end up a piece down. I suspect a lot of analysis of the sacs on e6, though. The possibility draws the eye. |
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| Dec-04-10 | | rilkefan: "I suspect a lot of analysis of the sacs on e6"
Sheepishly not bothering to report my wrong line. Maybe on weekend puzzles I'll give up trying to do these in my head. Is there a way to get the puzzle position to be a viewer, or to include a link to a viewer of the position without the associated game score so one could push the pieces around without setting up a set? |
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| Dec-04-10 | | RandomVisitor: 14.exf6! bxc3 15.Qe2!
click for larger view and now: Rybka4
<[+1.09] d=19 15...Rb8> 16.b3 Qxf6 17.Bxa6 Be7 18.h4 e5 19.fxe5 Qxe5 20.Nf3 Qe4 21.Ba7 Qxe2 22.Bxe2 Rc8 23.Bd4 0-0 24.Rhe1 Be6 25.Ba6 Ra8 26.Bd3 Rfc8 27.Be4 Rab8 |
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| Dec-04-10 | | AGOJ: The move played didn't occur to me. The fact that I didn't see an advantage in other moves should have made me look harder for the solution. Oh, well, back to the cricket. |
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Dec-04-10
 | | al wazir: No points for me. I considered only 20. Ndxe6, which fails badly, and 20. Qg3, which wins after 20...Bxd4 21. Qxg7, but loses after 20...O-O. |
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| Dec-04-10 | | hedgeh0g: A tough one. I considered every conceivable sacrifice on e6, but missed 20.Ng6!, where 20...fxg6? is answered by 21.Qd3. |
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| Dec-04-10 | | M.Hassan: "Very Difficult" White to play 20.?
White has lost 2B's & 2pawns, Black has lost 2N's & 2 pawns. Supposed to be equal.
IMO, the best move would be to attack the White Rook being in a congested area. So:20.Qd3 Bb5(forced)
21.Ng6 <if..fxg6 22.Qxg6+ Ke7 23.Nxb5+ and Black Queen is lost. Also, 22....Kd7 23.Qxe6#>
21.............Rg8
22.Qf3 Qd7 or may be c7
23.Qa8+ Qd8 (if Ke7, Rook is lost)
24.Qxd8 Kxd8
25.Nxe6+ Kc8 <if...Ke8 26.Rd8#>
26.Rxf7 Re8
27.Nc7 Rd8
28.Rxd8 Kxd8
29.Nxb5 axb5
This is as far as I can continue.White by now is 2 pawns up and may have a better endgame.
Time to check
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?????? |
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| Dec-04-10 | | Once: <Phony Benoni: I suspect a lot of analysis of the sacs on e6, though. The possibility draws the eye.> Very true - we tend to focus on squares enemy pieces which are attacked by two or more of our own pieces. As to the puzzle, I was miles off. A tough one indeed. |
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Dec-04-10
 | | offramp: After 20.Ng6 Black would have said, "What have you taken?" |
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| Dec-04-10 | | tacticalmonster: 1) White queen is tied down in an awkward pin on d4 2) The c4 rook is awkwardly placed and it has no retreating square 3) Black is behind in development: The black is stuck in the center and the h8 rook is out of play 4) The f1 rook put pressure on the weak f7 pawn through the half-open f-file 5) Black has weak light square complex (f7 and g6). Possible sac on the e6 pawn to open up the e8-h5 diagonal Candidate: 20 Ng6
a) 20...fxg6 21 Qd3 Qb6 22 Qxc4- White emerge an exchange up b) 20...Rxd4 21 Rxd4 Bxd4 22 Qf4 f6 (22...f5 23 Nxh8 Qb6 24 Rd1 Bc5 25 Qh4 ) 23 Nxh8 Bxe5 24 Qg4! Qe7 25 Qg6+ Kd8 (25...Kf8 26 Qh7!) 26 Nf7+ Kc8 27 Nxe5 fxe5 28 Qf7 c) 20...Rg8 21 Rxf7! Rxd4 (21...Kxf7 22 Rf1+ Ke8 (22...Kxg6? 23 Qe4+ Kh5 24 g4+ Kh4 25 Nf3+ Kh3 26 Rg1! Rxe4 27 Rg3#) 23 Qf3 Qe7 24 Nxe7 Bxe7 25 Qf7+ Kd8 26 Qxg8+) 22 Rxd4 Bxd4 23 Qf4 Bb5 24 Rf8+ Rxf8 25 Qxf8+ Kd7 26 Qd6+ Kc8 27 Ne7+ Qxe7 28 Qxe7 |
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| Dec-04-10 | | dzechiel: Not much time tonight, and I didn't get it anyway (I wanted to play 20 Nfxe6). After looking at the text, there's no way I would have come up with this. Hope to have more time tomorrow. |
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| Dec-04-10 | | tacticalmonster: missed the strongest defense 21 fxg6. I will only give myself partial credit for this puzzle. |
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| Dec-04-10 | | lost in space: Nothing for me today. Tried to make 20. Nxe6 work without success. Nether thought about 20. Ng6 |
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| Dec-04-10 | | JohnBoy: <M.Hassan ... 20.Qd3 Bb5(forced)> Why is 20...Bb5 forced? What is wrong with 20...Rxd4? |
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| Dec-04-10 | | David2009: L Hazai vs Szabo, 1983 White 20? In this competitive tacticl position, White has a shot 20 Ng6! (seeing that 20 Nxe6 [hoping for fxe6] fails to Bxe6). Variations: (A) ...fxg6 21 Qd3 picks up the exchange because of the mate threat 22 Qxg6+ Ke7 23 Qf7# (B) ...Bxd4 and there are two replies (B1) 21 Qf4 and (B2) 21 Qf3 Analyse both:
(B1 and B2) 21...Qc8 22 Qxf7+ Kd8 22 NxRh8 wins the exchange safely;
(B11) 21 Qf4 f6 or f5 22 Nxh8 Bb5 (the Bd4 is attacked twice) looks OK for Black ;
(B12) 21 Qf4 f6 or f5 22 Rxd4 Rxd4 23 Qxd4 Rg8 24 Rd1 and Black looks tied up but has Kf7 attacking the Ng6
(B21) 21 Qf3 f6 or f5 22 Nxh8 White is the exchange up and 22...Bb5 has less sting (Qh5+ with Rf4 a possible follow-up) (C) ...Rxd4 21 Rxd4 Bxd4 22 Qf4 or perhaps Qf3 (analyse when/if Black plays this sequence- both look good).
Conclusion: we play Ng6 and think in Black's time. Time to
check:
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Black chose defence (C) and I am lucky - I had missed 21...fxg6 garnering Black two pieces for a Rook, but the game shows White has an OTB refutation. Crafty End Game Trainer check of the puzzle position:
click for larger view L Hazai vs Szabo, 1983 White 20?
http://www.chessvideos.tv/endgame-t...
Crafty EGT follows the game line with a marginal improvement but drifts into a lost R&P and then K&P ending. Over to you to polish the ending off! You are white in the puzzle position (link above), drag and drop the move you want to make. |
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| Dec-04-10 | | howlwolf: The first thing I saw was 20 Qf3 and that black couldn't take because 21Ng6 smites him and black has no defense to the mating threats on f7. Problem with that is black could castle and get out of his problems. So then Ng6 to keep him from castling was pretty easy to find and allows white to exploit f7 weakness. I dismissed 20 Nxe6 pretty quickly because of the pin on the d4 knight. I had a couple of misses last week but so far so good. Bring on Sunday. |
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| Dec-04-10 | | JG27Pyth: Above my pay-grade. |
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| Dec-04-10 | | WhiteRook48: i tried nfxe6 |
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| Dec-04-10 | | kevin86: I saw the solution was not defensive play,but a quick attack. Ng6 was the most obvious-it forbids castling and opens up the adverse side. |
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| Dec-04-10 | | KingG: I saw 20.Ng6, and a few of the lines, but missed the one played in the game. |
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| Dec-04-10 | | xombie: Ng6 is clear enough. But I didn't see what to do after 21. Bxd4, and fxg6, which upon closer examination seems to lead to similar lines as in the actual game. Too much work though! |
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Dec-04-10
 | | Jimfromprovidence: I loved this puzzle. There’s such great board vision by white. 20 Ng6 was fantastic, attacking the rook just in time to prevent black from castling, as pointed out by <howlwolf>. White also knew that after 20…fxg6 white wins black’s rook and attacks the bishop, because black has to deal immediately with the mate threat after 21 Qd3. I also liked the subtle 22 Qe4 (as opposed to 22 Qg3. 22 Qg3 poses the same mate threat but allows the black queen to intervene with 22…Qg5). The line I’m having a lot of difficulty with is after 22…Qc7!?, below, instead of the text 22…Qe7. 
click for larger viewHere white cannot play 23 Rxd7 as in the text, because black simply takes back with the king (which he cannot do with the queen on e7). I’m not sure what the winning plan is in this scenario. |
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Dec-04-10
 | | scormus: I'm not doing very well with this one. Tried variuos combos saccing N, Q and none of them have worked unless B blunders. So I'll go for 20. Nh5 and get a modest advantage whether B castles or exchanged on d4. Basically, I've been defeated today. |
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Dec-04-10
| | scormus: Nowhere near. <Jim> sums it up perfectly. So many possibilitlies along the ways, a very rich pouzzle. It will be interesting to check if there was an adequate defence. Have to get the engine on it, too much for scormus' brain. BTW, its not Sunday already is it? |
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Dec-04-10
 | | doubledrooks: <KingG> wrote: <I saw 20.Ng6, and a few of the lines, but missed the one played in the game.> Ditto. For example:
a. 20...Rxd4 21. Rxd4 Bxd4 22. Qf3 f5 23. Nxh8 
b. 20...fxg6 21. Qd3 Bb5 22. Qxg6+ Kd7 ( Ke7 23. Qf7#) 23. Nxb5+ Kc6 24. Rxd8 Rxd8 25. Nd6 c. 20...Rg8 21. Qf3 f5 22. Nxe6 Bxe6 23. Rxd8+ Kxd8 with advantage to white. |
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Kibitzing
sac: 23.Rxd7