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| Mar-01-15 | | iamsheaf: 23.Ne6! is the correct move, no doubt. But white's continuation after that is dubious. The whole line is not forced... there are many superior continuations than the one chosen by white. For example, 24.Nc5 is completely pointless, much simpler Nxf8 follows by Bd4 wins on spot, no idea why white had to complicate it so much |
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| Mar-01-15 | | iamsheaf: This is a wednesday puzzle... if you forget the unnecessary 24. Nc5 and the continuation that followed |
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| Mar-01-15 | | iamsheaf: Is the score sheet correct?! there are so many bizarre moves by white in a completely winning position... Normally Sunday puzzles are meaningful, this one isn't |
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| Mar-01-15 | | jith1207: In this line, 27.Bxe5 mates in one move unless black sacrifices queen. Looks like white missed that. Can anyone correct me if I am going wrong. |
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| Mar-01-15 | | Fabrizio Vanzan: jith1207: 27be5 qc5.
27bg6 and mate:
..hg6 28 qh8
..ng6 28 nh6
..rf7 28 rf7 nf7 29 qh7 kf8 30 qf7 |
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| Mar-01-15 | | morfishine: I had <23.Rf6> followed by Raf1 rushing the remaining forces into battle After going over the game I noticed White played 33.Bxc5 instead of grabbing the Queen with 33.Qxc7 Thats stranges as mentioned by <others> 32...Bc5 was an inexplicable blooper by Black, which White overlooks!...I guess... ***** |
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| Mar-01-15 | | jith1207: jith1207: Thanks Fabrizio, I missed that was a check for Black. However, If 27. Bxe5 Qxc5+, would not 28. Rf2 would hold on the check while white needs only one move Nh6 to make a checkmate? Can any one give a refutal line for this case. |
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| Mar-01-15 | | Once: Hmm ... another odd one. I got to Ne6 pretty quickly, but then I wanted to play Nxf8 winning the exchange. After 5 mins on my chugging laptop Fritzie is telling me that 24.Nxf8 is about half a prawn stronger than 24.Nc5. It's currently at +2.69 for Madonna's material girl approach and +2.08 for the game continuation. HOLD THE FRONT PAGE! Ten minutes in and the evaluation has just jumped to +4.78 for 24.Nxf8 while 24.Nc5 is holding steady at +2.06. If that holds true, all the game continuation after 24.Nc5 becomes moderately irrelevant. Yesterday didn't feel like a Saturday. Today doesn't feel like a Sunday. And yet again we find ourselves wondering where the weekend went. |
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| Mar-01-15 | | gofer: We have our beautiful knight stationed on h6, all we need now is
our DSB (or queen) on the a1-h8 diagonal. d4 is the obvious square
to make this happen, but its currently occupied by one of our own
pieces. So really is this POTD "Insane" or just a logical
progression of a theme we should all recognise?
<23 Ne6 ...>
23 ... Nf5
24 Rxf5! fxe6
25 Rxf8+ Bxf8 (Qxf8 25 Bd4 Bf6 26 Rf1 Nd7 27 Rxf6  ) 26 Bd4! Bxh6
27 Qxh6 Qc7
28 Rf1 Qg7
29 Bxe4+ Qxe4
30 Rf8+ Rxf8
31 Qxf8#
23 ... Qd7
24 Nxf8 Bxf8 (Rxf8 25 Bd4 Qe6 27 Rae1 )
25 Bd4 Bxh6 (Nc4 26 Rxf7 )
26 Qxh6 Nc4
27 Bxg6 fxg6
28 Rf8+ Rxf8
29 Qxf8#
<23 ... fxe6>
<24 Bd4 ...>
The problem for black at this point is white has two horrible
threats, one the obvious mate along the a1-h8 diagonal, but the
other is the equally horrible Nf7 royal fork, which can be used
either win the queen or place Rf1 on f7...
24 ... Nf7
25 Nxf7+ Rxf7
26 Rxf7 Qg8
27 Bxe5+ mating
24 ... Bxg5
25 Bxe5+ Bf6
26 Rxf6 mating
24 ... Nc4
25 Nf7+
24 ... Nf7
25 Rxf7
~~~
Surely, white made a meal of this???!!! I really can't see <24 Nc5> as the best option.
Isn't <24 Nxf8> far more forcing! It wins an exchange, removes a defender of Pf7, allows
Bd4 without the loss of tempo.
<Once> what does Herr Fritz say to White's best move at <24 ?>? |
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| Mar-01-15 | | agb2002: White is one pawn down.
The dark square bishop would be better placed on d4. This suggests 23.Ne6: A) 23... fxe6 24.Bd4
A.1) 24... Bxg5 25.Bxe5+ Bf6 26.Rxf6 wins.
A.2) 24... Ndf7 25.Nxf7+ Rxf7 26.Rxf7 wins.
A.3) 24... Ndc4 25.Bxc4
A.3.a) 25... Qc7 26.Nf7+
A.3.a.i) 26... Kg8 27.Bxe5 Qc5+ 28.Bd4 and the double threat 29.Nh6# and 29.Bxc5. A.3.a.ii) 26... Rxf7 27.Rxf7 h5 28.Bxe5+ Qxe5 29.Rxe7 dxc4 30.Rxb7 Qc5+ 31.Qf2 Qxg5+ 32.Kh8 Qd5+ 33.Qg2 + - [R vs 2P]. A.3.b) 25... Bd6 26.Nf7+ Rxf7 (else 27.Nxd8) 27.Rxf7
A.3.b.i) 27... h5 28.Bd3 + - [R vs N+P] and the double threat 29.Rxb7 and 29.Bxg6. A.3.b.ii) 27... Qg8 28.Rxb7 dxc4 29.Rd7 Bb8 (29... Rd8 30.Rxd6 Rxd6 31.Bxe5+ Qg7 32.Bxg7+, etc.) 30.Rf1 and Black is defenseless against Rf8 Qxf8 Qxh7#. A.4) 24... Rxf1+ 25.Rxf1 looks even worse than previous lines due to the defenseless square f7. B) 23... Nf5 24.Rxf5
B.1) 24... fxe6 25.Nf7+ Rxf7 26.Rxf7 h5 (26... Qg8 27.Rxe7 wins decisive material) 27.Bxg6 Nxg6 28.Qxh5+ Kg8 29.Qh7#. B.2) 24... Qe8 25.Bd4
B.2.a) 25... gxf5 26.Bxe5+ f6 27.gxf6 wins.
B.2.b) 25... Bd6 26.Nxf8 gxf5 27.Nxh7 Kxh7 (else Nf6 and White is one piece ahead) 28.Nxf5+ Kg8 29.Nxd6 wins. C) 23... Qc7 24.Nxf8 Rxf8 25.Bd4 with material advantage an an overwhelming position. |
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| Mar-01-15 | | gofer: Wow! I post and see <Once> has already answered my post! Talk about Freaky Friday, this must be <Psychic Sunday!> Now that just proves this was way too simple for a Sunday! |
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| Mar-01-15 | | wooden nickel: <agdb2002>
C) 23... Qd7 instead of Qc7... always a pleasure reading your thorough analysis!<morfishine After going over the game I noticed White played 33.Bxc5 instead of grabbing the Queen with 33.Qxc7>
Looks like a Zeitnot situation!
25.Nb5 didn't look good either, 25.Nf5 is insufficient but worth a try! 
click for larger view
after
25. ... Nf5 and then maybe 26.Rxf5 gxf5 27.Nd7 Qxd7 28.Bxe5+ f6 |
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Mar-01-15
 | | Penguincw: What a way to start off the month: with a Sunday puzzle. Too bad today didn't have an error. Anyway, usually on Sundays, my goal is to simply guess the first move and call it a day, but I missed it (23.Bxg6). |
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| Mar-01-15 | | jith1207: I was wrong, Bxg6 does the job right. |
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| Mar-01-15 | | patzer2: <Once: Hmm ... another odd one. I got to Ne6 pretty quickly, but then I wanted to play Nxf8 winning the exchange.
After 5 mins on my chugging laptop Fritzie is telling me that 24.Nxf8 is about half a prawn stronger than 24.Nc5. It's currently at +2.69 for Madonna's material girl approach and +2.08 for the game continuation. HOLD THE FRONT PAGE! Ten minutes in and the evaluation has just jumped to +4.78 for 24.Nxf8 while 24.Nc5 is holding steady at +2.06.> As you and others note 24. Nxf8 is much stronger. However, getting more than the exchange up out of it is a bit complicated: 24. Nxf8 Bxf8 25. Bd4! Bg7 (diagram below)
click for larger view26. Rae1! Re8 27. Bxe5 Rxe5 28. Rxe5 Bxe5 (diagram below) 
click for larger view29. Bxg6! hxg6 (29...fxg6 30. Rf8+ Kg7 31. Rg8#) 30. Nxf7+ Kg8 (30...Kg7 31. Qh8#) 31. Nxe5 (+7.07 @ 22 depth, Fritz 12). |
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| Mar-01-15 | | Marmot PFL: This is complicated, most of the pieces on the board. Black DSB off of the g7 sq., so 23 Ne6 fe 24 Bd4 looks winning. If instead of taking the queen moves 24 Nxf8 looks good enough. |
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Mar-01-15
 | | scormus: The only think I got right after several minutes looking at today's POTD .... was that I wasn't going to come close to solving it. I didn't even get the first move :( Then again, neither did Rybka ;) |
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Mar-01-15
| | scormus: Ah, I take it all back. Well, just the last part anyway. Rybka did get 23 Ne6, eventually. d=20, 113 Mnodes! Got 24 Nxf8 as well ;) |
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Mar-01-15
 | | chrisowen: At case in point e6 longer bill to rights ave.
Again cage i gas said give sag in as i good bash have bush head carte e6 blanche hope ever heads and footed choose horse e6 first port of cull sage rough boat black on stormy waters feather for boa stint in adventure around kingside nearly all pieces targetted at ebony as h8 a king shake down best looks to win forged exchange off re you came light a toe poke harvest h8 and win rook f8 should be the right call ash d4 up on time a throb h6 angle humper lash i ply ja beats clove
elusive win outright although king has little dint shelter ko in us agree e6 and wind f8 rook up holy in light fatefuls a gob h4 stopper a strike at the heart h6 an angle barb f5 mind jangle over the d4 lions e6 milly i on d3 an e3 great too back up san greal e6 i net a point blood from a stone though thorny ground to finish him off ever smoothe knight cob d4 amor fati i fat oath queen bullseye i fate in honour and
hope ever tickled for bait ok in ogles e6 son file an tile fat chance affabled mission selects i on d4 late if fetter the chain e6 arm i owe us a debt of gratitude in uniform appraisal on the road horse e6 in sic lew down i never hail flew away in ive a cream off the top h4 at keeps track and two key digonals act d4 um bless horse line e5 bind
an g3 at ebber c7 like at could play arrow in do feather bind horse e6 a drive dim map mind plink plink e6 baby grow over not until the fat lady sung and that be at thirty in, |
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| Mar-01-15 | | BOSTER: After 23.Ne6 Qd7.
Even the evaluation 24.Nxf8 +4.78 is high enough, but I think that the move 24.Bd4 with sacr. the knight e6 and pinning black knight e5 maybe more strong. And this is more fits for Sunday puzzle. |
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Mar-01-15
 | | Jimfromprovidence: In the line of <patzer2> 23 Ne6 Qd7 24. Nxf8 Bxf8 25. Bd4! Bg7 26. Rae1! Re8 27. Bxe5 Rxe5 28. Rxe5 Bxe5 29. Bxg6!, here is the position.
click for larger view As he stated, black cannot play 29...fxg6 because of 30. Rf8+ Kg7 31. Rg8#) So if black calculated this and tried 26...Qe7 instead, it keeps the rook on the back rank to prevent that successful first scenario threat 30 Rf8+. 
click for larger viewBut it does not make a difference. White still wins neatly after 27 Bxe5 Bxe5 28 Rxe5 Qxe5 29 Nxf7+! 
click for larger viewAfter 29...Nxf7, white has 30 Rxf7.
click for larger viewNow he both threatens mate and black's bishop. What makes this tough for white is that he has to dance some if black tries 30...Qe3+. This might be a better puzzle than first thought. |
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| Mar-01-15 | | AvidChessMan: This was a tossup between 23. Ne6 or Nf7. Many different ways for white to get to the king: knight forks, pawn pin and bishop skewer. It all depends on what black does on defense. I was anticipating a more aggressive approach from white after 23. Ne6 - stripping the pawns away from the black king. |
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| Mar-01-15 | | CarlosO: 32...Bc5 is a tipo error?. 33.Qc7 is possible
Thanks. |
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| Mar-01-15 | | DarthStapler: I got the first move |
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| Mar-02-15 | | lost in space: 23. Ne6 and 24. Nxf8 was was „my way" |
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