|Mar-14-15|| ||fokers13: saw the first 3 moves thought W's position was promising so i left it at that.|
not a hard start for a saturday puzzle at least
|Mar-14-15|| ||Dr. J: I saw the first three moves: 20 Nxg6 fxg5 (or A1) 21 Nxe7+ Rxe7 (or B1 or B2) 22 Rxe7 and considered this sufficient: White has won ♖♙♙ for ♗♘ with huge threats - Qf5, d6, or Rxc5, and Black has no development or counterplay.|
(A1) 20...fxg6 21 Qxg6 Rf8 (or 21...Nbd7 22Bh6) 22 Rxe7.
(B1) 21...Kf7 22 Qf5+ Bf6 23 Qxh7+ and mates in 3 more
(B2) 21...Kh8 22 Ng6+ hxg6 23 Rxe8+ Kh7 24 d6
... but now I'm not so sure: what does White do against (A2) 20...Kf7?
|Mar-14-15|| ||offramp: Very very tough. I thought 20.d6 might have won.|
|Mar-14-15|| ||An Englishman: Good Evening: I saw the line with the game move, followed by 20...hxg6; 21.Qxg6,Kf8; 22.d6 and White has threats everywhere.|
|Mar-14-15|| ||Steve.Patzer: I looked at 20. d6 also.|
|Mar-14-15|| ||scormus: <Dr. J> Yes, "finding" 30 Nxg6 comes easy, but checking all the B replies is a fair bit more work. |
I wondered about ... Kf7 too, but 21 Nxe7 seems adequate. But 21 Bh3! is an absolute killer. If ... hxg6 it's # in 3.
|Mar-14-15|| ||M.Hassan: "Very Difficult"
White to play 20.?
Equal. White has the Bishop pair for a Bishop and a Knight.
21.Qxg6 Nb8d7 to connect Rooks
22.Bh6 and mate next move
White is way ahead in material and wins
and above line will be continued
Again White is stronger and wins
|Mar-14-15|| ||morfishine: For a variety of reasons, White has mounted a number of threats exceeding that which Black can answer. These can be summarized as better and more efficient development|
20.Nxg6 hxg6 21.Qxg6 Qc8 22.Bxf6 (Oops)
Or 20...fxg5 21.Nxe7+ Kf8 22.d6 N8d7 23.Qxh7
Very nice finish by Filip
|Mar-14-15|| ||gofer: The only problem with today's POTD is choosing which of
black's positional weaknesses to attack first?!
a) d6 attacking the loose Ra8
b) Nd3 attacking Pc5 and then cementing the knight on e6
c) Nxg6 attacking Pe7 and threatening mate if black takes back
Hmmm, I think we combine c) and a) and see what happens!
<20 Nxg6 ...>
20 ... fxg5
21 Nxe7+ Rxe7 (Kf8 Qf4+ mating or Kf7 Qxh7 )
20 ... hxg7
21 Qxg6 ...
21 ... N8d7 22 Bh6 mating
21 ... Rf8 22 Rxe7 mating
21 ... Bxg5
22 Qxe8+ Bf8 (Kh7 23 Be4+ Kh6 24 Qg6#)
23 Rxe7 mating
So black cannot take either Ng6 or Bg5!
<21 ... Nbd7>
<22 Nxe7 Kh8>
<23 Bd2 ...>
click for larger view
Black has won two pawns and still has multiple threats
starting with d6 or Re4.
Hmmm, I really didn't think black could accept either the bishop or knight!
|Mar-14-15|| ||Dr. J: <An Englishman: 20...hxg6; 21.Qxg6,Kf8; 22.d6> I see I overlooked that defense. But I think this refutes it outright: 22 Bh6 Bxh6 23 Qxh6+ Kg8 29 Qg6+ Kf8 30 Re4, etc.; or similarly, if here 23...Kf7 24 Qh7+ Kf8 Re4. In both cases ♕+♖ mate.|
<scormus: 20...Kf7 21 Nxe7 seems adequate. But 21 Bh3! is an absolute killer. If ... hxg6 it's # in 3.>
Not sure I follow. What happens after 21 Nxe7 Rxe7, or your preferred 21 Bh3 e5?
<scormus: <Dr. J> Yes, "finding" 30 Nxg6 comes easy, but checking all the B replies is a fair bit more work.>
Yes, it's becoming clear that today's puzzle is quite easy ... until you begin to understand it.
|Mar-14-15|| ||diagonalley: yep... 20.NxP is fairly easy to pick out... OTB i'm sure i would have played it in faith, without trying to look too far ahead (certainly the game line would be difficult to foresee)|
|Mar-14-15|| ||Penguincw: 20.Nxg6 is just being screamed out to being played. The only followup I calculated was 20...hxg6 21.Qxg6.|
|Mar-14-15|| ||dfcx: 20.? white is far ahead in development, white's knight and bishop is forked by f6 pawn. white has several choices: Bxf6, d6 and Nxg6. |
Bxf6 loses to exf6.
with 20.d6 fxe5 21.Bxa8 exd6 white trades an active knight and passed pawn with a inactive rook. this leaves us with
A.20...fxg5 21.Nxe7+ Rxe7 (Kh8 Ng6+) 22.Rxe7 N8d7 23.Qf5 Rf8 24.Qe6+ Kh8 25.Rxd7
B.20...hxg6 21.Qxg6 Kf8 (Rf8 Rxe7) 22.d6!
|Mar-14-15|| ||kevin86: The sac was obvious, but the increasing mobility of the pieces is hard...|
|Mar-14-15|| ||vajeer: What is black plays 20...Nc8|
|Mar-14-15|| ||scormus: <Dr. J: ...... What happens after 21 Nxe7 Rxe7, or your preferred 21 Bh3 e5?>|
how about 22 dxe6+ Kg8 23 e7? I think it's 1-0 (eg ... hxg6 24 Qxg6, threatening Qxe8+ and Be6+)
|Mar-14-15|| ||scormus: .... but I agree, you start thinking "what if this? what if that?" and there's more to it than is obvious at first :)|
|Mar-14-15|| ||agb2002: White has the bishop pair for a bishop and a knight.|
Black threatens 20... fxe5 and 20... fxg5.
The first idea that comes to mind is 20.Nxg6:
A) 20... hxg6 21.Qxg6
A.1) 21... Rf8 22.Rxe7 wins.
A.2) 21... N8d7 22.Bh6 wins.
A.3) 21... fxg5 22.Qxe8+ Bf8 (22... Kh7 23.Be4+ Kh6 24.Qg6#) 23.Qg6+ Kh8 (23... Bg7 24.Rxe7 wins) 24.Be4 and 25.Qh7#.
A.4) 21... Kf8 22.Bh6 Bxh6 23.Qxh6+
A.4.a) 23... Kf7 24.Qh7+ Kf8 25.Bf3 e5 (25... Rc8 26.Bh5 and 27.Qf7#) 26.Bh5 Qb7 (26... Re7 27.Qh8#) 27.Qxb7, etc.
A.4.b) 23... Kg8 24.Qg6+ Kf8 25.Bf3 is similar to A.4.a.
B) 20... fxg5 21.Nxe7+
B.1) 21... Kh8 22.Ng6+ hxg6 23.Rxe8+ Kh7 24.Re6 + - [R+2P vs 2N], with a winning attack.
B.2) 21... Kf8 22.Qf5+ Bf6 23.Qxf6#.
B.3) 21... Kf7 22.Qf5+ Bf6 23.Qxh7+ Bg7 (23... Kf8 24.Qg8#) 24.Qf5+ Bf6 25.Qg6+ Kf8 26.Qg8#.
B.4) 21... Rxe7 22.Rxe7 + - [R+2P vs 2N], with several threats (Qf5, d6, Rxc5, etc.).
C) 20... Qb7 21.d6
C.1) 21... Nc6 22.Ne7+ wins decisive material.
C.2) 21... Qc8 22.Rxb6 axb6 23.Bxa8 wins decisive material.
D) 20... Kf7 21.Nxe7 looks similar to the B lines.
E) 20... Nc8 21.d6
E.1) 21... hxg6 22.Qxg6 Nxd6 23.Bh6 wins (23... Nf5 24.Qxe8+).
E.2) 21... fxg5 22.Bd5+ e6 23.Rxe6 hxg6 24.Rxe8+ Kh7 25.Bxa8, etc.
F) 20... Bf8 21.Nxf8 with an extra pawn and an overwhelming position.
|Mar-15-15|| ||CHESSTTCAMPS: White has 2 bishops for knight plus bishop, but two minor pieces are currently forked. Given black's incomplete development and lightly defended king-side castled position, it makes sense to use desperado tactics to hit the weakened sector.|
20.Nxg6! is more technical routine than tactics. Black still has the choice of two pieces to take, but neither is very appetizing:
A) 20... hxg6? 21.Qxg6 fxg5 22.Qxe8+ Bf8 (Kh7 23.Be4+ Kh7 24.Qg6#) 23.Qg6+ Kh8 (23... Bg7 24.Rxe7) Be4 forces mate.
A.1) 21... Rf8 22.Rxe7 Rf7 23.Qxf7+ Kh8|h7 24.Qxg7#
A.2) 21... e5 22.Qxe8+ Bf8 23.Bh6 Qc8 24.Qg6+ Kh8 25.Be4 wins
A.3) 21... Nbd7 (and others) 22.Bh6 wins
B) 20... fxg5 21.Nxe7+ Rxe7 22.Rxe7 N8d7 23.Qf5 Rf8 (otherwise 24.Qf7+) 24.Qe6+! Kh8 25.Rxd7! with material advantage and dangerous passed d-pawn.
B.1) 20... Kf8? 21.Qf5+ Bf6 22.Qxf6#
B.2) 20... Kf7? 21.Qf5+ Bf6 22.Qxh7+ Bg7 23.Qf5+ Bf6 24.Qg6+ Kf8 25.Qg8#
B.3) 20... Kh8? 21.Ng6+ hxg6 22.Rxe8+ Kh7 23.d6 nails the undeveloped rook.
There is more detail to do in B, but I'll stop here. Time for review...
|Mar-15-15|| ||CHESSTTCAMPS: Didn't quite quite spell out the solution far enough. It was a very pretty finish (though white could win in many ways at the end e.g. 28.Rxa7).|