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|Dec-25-10|| ||goodevans: <dzechiel: ... OK, I'm sure everyone will agree the key move was kind of telegraphed.>|
A real Christmas present from CG.com (after yesterday's mean spoiler).
Merry Christmas all!
|Dec-25-10|| ||AlgorithmicChess: I would have chosen Nf6+ in a game. Capture was necessary afterwards.|
26. Nf6+ gxf6
Puts a discovery on the queen. If it moves to d8 I think white gets the advantage with bishop pair.
28. Qxd8 Bxd8
I think this is slightly better for white, but maybe black can blockade if he's lucky.
If queen moves to other square, I think black is worse than the other line.
28. fxe7 Bxf3
Should leave black with a large advantage with advanced passed pawn and queen/bishop vs queen/knight with black's king exposed.
However the obvious refutation is simply 27...Bd6
Leaves black up a full piece. However, maybe there is hope for white with
28. Bxb7 Bxg3
But in any case probably still lost a pawn and will be looking to draw instead of win.
|Dec-25-10|| ||tacticalmonster: 1) White has a crushing space advantage on the whole area of the board: b5 pawn, e5 pawn and h4 pawn|
2) White's pieces are much more active:
a) WQ controls the only open file
b) WDB x-ray BQ along the g3-c7 diagonal
c) WN occupy e4 outpost and has great ambition on the d6 square
d) WLB control the long h1-a8 diagonal
3) e8 knight is hanging and the b7 bishop is insufficiently defended
Candidate: a) 26 Nf6+ and b) 26 Nd6
a1) 26...Nxf6 27 gxf6- win a piece
a2) 26...Bxf6 27 Qc8 Bxb7 28 Qxb7 Qd8- win a piece
a3) 26...gxf6 27 exf6 Bd6 28 Bxb7 Bxg3 29 Qxg3+ Qxg3 30 fxg3 Nxf6 31 Bf3 Nd7 Black is slightly better bec he has the better minor piece and the better pawn structure but White can hold
b) 26...Bxf3 27 Nxe8
b1) 27...Qc8 28 Nd6 Bxd6 29 exd6 Bb7 30 d7 Qd8 31 Bc7!- White has queen vs bishop
b2) 27...Qb7 28 Nd6 Bxd6 29 exd6 Be4 30 d7! Bxd3 31 d8=Q+ Kh7 32 Qxd3 White is up a piece
b3) 27...Qb8 28 Qd7! Kf8 29 Nd6 Be2 30 Nc8!- White will be up a piece
|Dec-25-10|| ||tacticalmonster: got it wrong! 28 Qd7 does not work bec of 28...Qb7!. If 29 Nc7 Bxg2 30 Qxe7 Bh3- White may be up a piece but he is getting mated!|
|Dec-25-10|| ||tacticalmonster: Merry Christmas to all! C.G gave us a mean Christmas present with this Sat puzzle! |
The first move is very easy to spot but the actual line actually goes from move 26 Nd6 all the way to 36 Qd6. This is just impressive! I seriously doubt any of us will see this all the way to the end.
|Dec-25-10|| ||Dr. J: <tacticalmonster: The first move is very easy to spot but the actual line actually goes from move 26 Nd6 all the way to 36 Qd6.>|
I don't think you have to see that far. I got the continuation up to 30 Qxf3 and judged the position won (pawn advantage, exposed king, continuing attack). In my view the continuation from 31-36 constitutes a new manoeuvre from a won position, and accordingly is not required for the solution.
|Dec-25-10|| ||standardwisdom: Merry Xmas everyone. I thought my Santa had arrived with Nf6+. Oh well.|
<tacticalmonster: The first move is very easy to spot but the actual line actually goes from move 26 Nd6 all the way to 36 Qd6.>
On that note, a question, why does black not play:
Does that not save the bishop?
|Dec-25-10|| ||goodevans: <standardwisdom: ... why does black not play:|
Does that not save the bishop?>
It does, but white simply trades into an easily won ending:
36 ... Kg6 37 Bxf8 Qxf8 38 Qxf8+ Kxf8 39 f4
Now what can black do? His pawns are rooted to their squares and his K must stay near the h-file to defend against g4/g5/etc. White's K is free to reek havoc however he chooses.
Bolbochan clearly though he stood better chances of a draw by giving up the B and getting his Q active.
|Dec-25-10|| ||Dr. J: <standardwisdom> 36 ... Kg8 37 Bxf8 Qxf8 38 Qxf8+ and the K+P ending is easily won. Black could have saved his piece another way by 32 ... h5 giving up a 2nd pawn to free the bishop, but it's no help: 33 Qxh5+ Kg8 34 Qg5+ Kh7 35 Bxf8 Qxf8 36 Qg7+, and this K+P ending is also won.|
|Dec-25-10|| ||scormus: <tacticalmonster: Merry Christmas to all! ... |
The first move is very easy but ... impressive!>
Likewise, a merry Christmas to all the chess addicts who cannot stay away today. And thanks to CG for a great POCD. Yes, first move easy to spot but the sequence runs really deep and I lost it on move 29 when I expected B to play ... Qd8?
|Dec-25-10|| ||timothee3331: I didn't even take 26.Nf6+ in consideration, that makes me think of Fischer's aphorism "patzer sees sac, patzer proceeds to sac !" After all what for ? White invest a piece only for an attack on the Black queen, there must be something wrong...
For me the tactics were easy, but still there are a few ones to calculate, maybe that justifies the difficulty-scale|
The relevant lines were:
I)26....Bxd6 27.exd6 Qd7 28.Bxb7 Qxb7 29.d7!
II) 26...Bxf3 this quickly appears as the only worthy reply 27.Nxe8!
now Black has a choice between
a)27...Qc8 28.Nd6! Bxd6 29.exd6 Bb7 30.d7 Qd8 31.Bc7! nothing too complicated or b)27....Qb8 28.Nf6+ gxf6 forced 29.exf6 Qe8 (29...Qd8 30.dxe7!) and here true 30.Qxf3! is very strong but 30.dxe7 Bh5 31.Qd8 f6 32.Bb8 Kf7 33.Bxa7 Qxe7 34.Qxb6 which i chose since i didn't investigate much further (was there some need ?) (in fact, i didn't look even after 30.dxe7) makes White strongly pulling.
Still, it was a very nice Chritmas puzzle, featuring interesting tactics !
|Dec-25-10|| ||gmalino: <phony> So who else will go for 26.Nf6+, figuring this would be a relatively easy Christmas gift?|
--> me too!
Merry christmas to cgc members!
|Dec-25-10|| ||WhiteRook48: oh, wow, I actually got the first 4 half-moves....
not so brilliant.
|Dec-25-10|| ||Peligroso Patzer: An interesting variation would have arisen if Black had played <29. … Qd8> (hoping for 30. Qxf3 Bxf6 with approximate equality). However, in the position after the hypothetical 29. … Qd8: |
click for larger view
White ignores the attack on his Queen and wins playing 30. fxe7 Qxd3 31. e8=Q+ with a strong attack and the f3-Bishop still en prise.
|Dec-25-10|| ||VincentL: Merry Christmas everyone.
Ng5 and Nf6+ don't appear to lead anywhere, so is must be 26. Nd6
Now if 26..... Nxd6 27. exd6 forking Q and B. So I think 26.....Qxf3 27. Nxe8 Qc8 28. Qxf3 Qxe8. Now 29. Qb7 wins a pawn.
I have probably gone astray somewhere. Perhaps even the first move is wrong (although I don't see anything else).
Let´s see what happened in the game.
|Dec-25-10|| ||VincentL: 28. Nf6+. I didn't consider this.|
|Dec-25-10|| ||Patriot: I spent way too much time on variations for 26.Nf6+, when I decided to look more into 26.Nd6 although I noticed both candidates quickly. The main problem with my analysis is that I should have looked at the most critical line first: 26.Nf6+ gxf6. This would have caused me to reject the line and look more closely at 26.Nd6. But to say it drops a piece and stop there is also a mistake. 27.exf6 (hitting both queen and bishop) so far is not "losing a piece". I did see the variation 26.Nd6 Bxf3 27.Nxe8 Qc8/Qb8 and the possibility of 28.Nf6+ or 28.Nd6 but didn't quite see the merits. I erroneously thought it might even draw and so 26.Nf6+ became my choice because it seemed to allow more ways for black to lose.|
<tacticalmonster> Your line (a3) explains very well why 26.Nf6+ is not best. If I examined this line first, I wouldn't have waisted so much time on 26.Nf6+ and probably would have spent more time examining the winning line.
I think some of you passing this off as "easy", did so too easily.
|Dec-25-10|| ||SufferingBruin: Nd6+ though I'm not sure I could have finished it.
Merry Xmas to the best dang board on CG.com!
|Dec-25-10|| ||gofer: Merry Christmas one and all!
26 Nd6 ...
26 ... Nxd6 27 exd6 Qd7/Qd8 28 dxe7 Qxd3 29 e8=Q+ Kh7 30 Bxb7 winning
26 ... Bxd6 27 exd6 Qd7 28 Bxb7 Qxb7 29 d7 winning
26 ... Qd7 27 Bxb7 Qxb7 (f6 28 Bc6 winning) 28 Nxe8 winning
26 ... Bxf3
27 Nxe8 Qc8
28 Nd6 Bxd6
29 exd6 Bb7
30 d7 Qd8
31 Bc7 Qxc7
32 d8=Q+ winning
|Dec-25-10|| ||wals: WAAAY out of my league.
Rybka 4 x 64
BLACK: depth : 24 : 15 min :
(+3.94):25...h6. Best, Qd8, 0.49.
1. (0.49): 25...Qd8 26.Nd6 Bxf3 27.Qxf3 Nxd6 28.exd6 Bxd6 29.Bxd6 Qxd6 30.Qa8+ Qf8 31.Qxa7 Qd8 32.a4 g5 33.a5 Qd1+ 34.Kh2 Qd6+ 35.g3 gxh4 36.Qa8+ Kg7 37.a6 hxg3+ 38.fxg3 Qd2+ 39.Qg2 Qh6+ 40.Kg1 Qc1+
2. (0.63): 25...Ba8 26.Nd6 Qd8 27.Bc6 Bxc6 28.bxc6 f6 29.Qe2 f5 30.Qh5 g6 31.Qd1 a6 32.Qb3 Ng7 33.Qa4 a5 34.Nb5 Ne8 35.Qb3 Kf8 36.Qe3 Kg7 37.Nd6 a4 38.Qd3
BLACK: depth : 24 : 3 min :
(+7.85):34...Qe8, nothing better.
Black, 37... Qe1+, +9.40, (Best, Qe2, +7.85),
increased the deficit and decreased even further,Black's winning chances and Black resigned move 41... .
|Dec-25-10|| ||botvinnik64: Wow! An opening that bears Kasparov's name - this game was played when he was just 3!! Talk about precocious!
Merry Christmas to all at CG. Happy New Year!!!|
|Dec-25-10|| ||tacticalmonster: < Dr. J > I think you really need to see all the way to move 36 to make it counts. White was only up a pawn with positonal advantage on move 30 but nothing decisive is on sight. By move 36, the position is decisive. Black is forced to make the decision to either go down a piece or trade into a lost king and pawn ending.|
OTB, move 30 is enough but for a puzzle you need to work out all the minor details to get the full mark.
|Dec-25-10|| ||Penguincw: I would've played Qe3 followed by Bf4 to start attacking the black king.|
|Dec-26-10|| ||patzer2: For yesterday's Saturday Christmas puzzle, 26. Nd6!! springs a multitude of tactics and combined operations to force a decisive material advantage.|
Here's a breakout move-by-move:
<26. Nd6!!> When in doubt make a threat. In this case, the double attack threatens 27. Nxb7 or 27. Nxe8! as in the game.
If 26... Bxd6, then 27. exd6 Nxd6 (27... Qd7 28. Bxb7 Qxb7 29. d7 is a winning passed pawn option) 28. Qxd6 Qxd6 29. Bxd6 wins decisive material.
<27. Nxe8!> This in between move (i.e. zwischenzug) is an essential followup.
If 27... Qc8, then 28. Nd6 retains decisive material.
<28. Nf6+!> This is White's strongest followup here.
<28...gxf6> This move allowing a decisive discovered attack threat diversion is pretty much forced.
If 28... Bxf6, then 29. exf6 Qe8 30.
Qxf3 leaves White up a whole piece.
If 28... Kf8, then 29. Qh7 wins the Queen after 29...Bxf6 30. exf6 gxf6 31. Qh8+ Ke7 32. Bxb8 .
<29. exf6 Qe8 30. Qxf3 Bf8 31. Qg4+ Kh8 32. Bd6> White's plan is to tie down, overwork and eventually win the Bishop on f8, due to the mate threat on g7.
<32...Qd8 33. Be7 Qe8 34. h5 Qa8 35. Qg3 Kh7 36. Qd6 Qe4>
If 36... Kg8, then 37. Bxf8 Qxf8 38. Qc7 Kh7 39. Qxa7 Qg8 40. Qxb6 allows the Queen to gobble up Black's Queen-side pawns for an easy win.
<37. Bxf8> With an extra piece, it's just a matter of simple technique after <37...Qe1+ 38. Kh2 Qxf2 39. Qd3+ Kg8 40. Bxh6 Qxf6 41. Qg3+> 1-0
Black resigns in lieu of such possibilities as 41...Kh7 42. Bg5 Qh8
43. Bd2 (43. Qf4 f5 44. Qc7+ Qg7 45. Qxg7+ Kxg7 46. Bf4 ) 43... Qe8 44. Bc3
|Dec-24-15|| ||offramp: <goodevans: ...Merry Christmas all!>|
Yes! Merry Christmas to everyone at chessgames.com!
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