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Dec-10-10
 | | Phony Benoni: Immediately looked at the discovery by the rook, but it obviously needs some setting up. 23.Rd7 would be an idea, if the diagonal was clear for the bishop. So look at moving the knight, but where? 23.Nxc6 suggests itself, so that if 23...bxc6 24.Rd7 Qxb3 25.Rxg7+ Kh8 26.Rxg6+ with mate to follow. Fine and dandy, but Black also has 23...Bxa1, eliminating the long diagonal threat. Can the knight then nudge Black's queen? Ah, 24.Nd8 forces her off the diagonal, without a good haven against the discovery by the rook. I think. This one looks pretty clear, though I expect other 23.N-moves to be investigated. |
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Dec-10-10
 | | White Star: remove the Knight, and the star move is not hard to find;
as always, it helps to know that a sac. is just round the corner; what happens if 23)...Bxa1 ? just trade down with more pawns I guess
easy for Friday |
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Dec-10-10
 | | dzechiel: White to move (23?). White is up a pawn. "Difficult." Experienced players will see the contention on the a1-h8 diagonal and immediately think about "windmills". But before anything like that can take place, white has to clear e5. Based upon that alone, I want to make the key move: 23 Nxc6
OK, white has made a capture, black needs to capture also. But where? On a1, or on c6? We need to consider both. Let's look at a1 first. 23...Bxa1 24 Nd8
Oops. The black queen is under attack, and anywhere she runs, white will have a nasty discovered check. Black could try 24...Rxd8 25 Rxd8+ Kf7
but this leaves black down an exchange and a pawn with no other compensation. Now let's consider black's other capture back on move 23: 23...bxc6 24 Rd7
Uncovering an attack on the black queen and attacking on g7 again. 24...Qxb3
This must be the key line.
25 Rxg7+ Kh8
Forced.
26 Rxg6+
Black has two useless interpositions:
26...Qb2 27 Bxb2+ Rf6 28 Bxf6#
I think this must be it. Time to check. |
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Dec-10-10
 | | al wazir: To hell with the puzzle. Where are the clues?
But I got 23. Nxc6, between glances at the clues page. |
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Dec-10-10
| | Phony Benoni: <dzechiel> One little point in your excellent analysis: after 23.Nxc6 Bxa1 24.Nd8 Rxf8 25.Rxd8+ Kf7, White can draw the king away from the queen with 26.Rf8+ Ke7 27.Re8+. |
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Dec-10-10
 | | Jimfromprovidence: I got 23 Nxc6 bxc6 24 Rd7 Rf6 25 Qxe6+ Rxe6 27 Rxg7+.
click for larger viewThis puzzle seems a cut below the usual Friday undertaking. There are a number of ways to win and none of them seem particularly difficult to find. Stylewise, I like 23 Nxc6 Qxc6?? 24 Rd8+, a forced mate. 
click for larger view |
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| Dec-10-10 | | tacticalmonster: 1) BQ pin the d5 rook to the WQ. But the BQ is undefended and it is lined up along the same diagonal a2-g8 with the BK. The BQ is pinned if the WR moves away. 2) e5 knight is attacked three times. g7 bishop is pinning the knight to the defense of the hanging a1 bishop Candidate: 23 Nxc6
a) 23...Qxc6 24 Rd6+ drop the queen
b) 23...Bxa1 24 Nd8! Rxd8 (any queen move end up losing the queen) 25 Rxd8+ Kf7 26 Rf8+ Ke7 27 Re8+ drop the queen c) 23...bxc6 24 Rd7! Qxb3 25 Rxg7+ Kh8 26 Rxg6+ - Black cannot avoid mate |
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| Dec-10-10 | | muralman: Durn it - this is not my week. |
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| Dec-10-10 | | rilkefan: I missed Nd8 in the Bxa1 line. |
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Dec-10-10
 | | M.Hassan: "Difficult" White to play 23.?
White is a pawn up.
It is noted that diagonal a2g8 is occupied by Black King, Black Queen, White Rook and White Queen sitting on different squares of this diagonal.If the Rook on d5 is removed,Black Queen becomes pinned and can only move along the diagonal including taking
the White Queen. White can make use of such pin by playing the following:23.Nxc6 bxc6 <not 23...Qxc6 24.Rc6+ and Black Q is lost>
24.Rd7 Qxb3
25.Rxg7+ Kh8
26.Rxg6#
If Black declines from taking the Knight, process becomes a little longer: 23.Nc6 Bxa1
24.Nd8 Rxd8 <if 24...Q moves away from the diagonal, a discovered check can be given culminating in loss of Black Queen>
25.Rxd8+ Kf7
26.Rf8+ Kxf8
27.Qxf6
Black Queen could have moved to g7 or d7.The result would have been same
White wins due to stronger materials
Time to check
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Tonight I am a "Difficult" survivor!!! |
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Dec-10-10
 | | patzer2: For today's Friday puzzle, the capture 23. Nxc6!! wins decisive material with a discovered attack after 23...bxc6 24. Rd7! The pin on the Queen prevents the capture of the Rook, while the Queen is merely a sham sacrifice decoy after the discovered check and mate-in-four following 24...Qxb3 25. Rxd7+ Kh1 26. Rxg6 Qc3 27. Bxc3+ Rf6 28. Bxf6#. P.S.: It took a little trial and error for me to solve this one. I initially tried to make something out of 23. Nxg6!? hxg6 24. Rd7 =, until I quickly realized 23. Nxc6!! bxc6 24. Rd7!  improves with a mating threat. |
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| Dec-10-10 | | chesssantosh: <dzchiel:23...Bxa1 24 Nd8
Oops. The black queen is under attack, and anywhere she runs, white will have a nasty discovered check. Black could try 24...Rxd8 25 Rxd8+ Kf7
but this leaves black down an exchange and a pawn with no other compensation.> ya it looks black is clearly lost but white has a clever way to finish it off on the spot by Rf8+...no matter black does his queen is lost.i find your comment fairly useful.you certainly deserve a handful of appreciation.so thanks a lot dzchiel |
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| Dec-10-10 | | Dr. J: <rilkefan: I missed Nd8 in the Bxa1 line.> I found it, but for me it was much the hardest part of the puzzle. Was that true for anyone else? |
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| Dec-10-10 | | gmalino: Ah, that's sucking! I looked at the position very unconcentrated and fuzzy, because fridays are usually too hard to solve for me. So I didn't invest that much energy thought about one forced line and then checked the game.
I had
23. Nxc6 bxc6
24. Rd7 Qxb3
25. Rg1+ Kh1
and now I just didn't see the mate in one! Only thinking this is drawn by perpedual.... Such an easy friday.... |
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| Dec-10-10 | | gmalino: By the way, after playing through the whole game I have to say that whites play is so forceful that it is a real pleasure to click through.
Respect! Great game! |
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| Dec-10-10 | | gmalino: Happy birthday cgc, thanks for your great work! Always a pleasure to come to your site. |
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| Dec-10-10 | | TheBish: V Cmilyte vs E Boric, 2008 White to play (23.?) "Difficult"
I assumed that the winning idea here would make use of the latent pin of Black's queen against her king, possibly sacrificing the white queen for checkmate. Turns out, my hunch was correct. 23. Nxc6!
This clears the path for the bishop on a1, which is a key player. Now Black has three replies, all losing: A) 23...Qxc6? 24. Rd8+! (much better than winning the queen with Rd6+ or Rc5+) Kg8 25. Rxf8#. B) 23...bxc6 24. Rd7! Qxb3 (other moves also lose, like 24...Re8 25. Rxg7+ or 24...Qf7 25. Rxf7) 25. Rxg7+ Kh8 26. Rxg6+ and mate in a couple. C) 23...Bxa1 24. Nd8!
This was the hardest line for me to find. In this line, White tries to drive the queen off the a2-g8 diagonal to give a wicked discovered check. 24...Rxd8
Otherwise, White will win the queen with a discovered check -- there's no place to hide! 25. Rxd8+ Kf7 26. Rf8+! Ke8 27. Re8+ Kxe8 28. Qxe6+ with an easy win. |
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| Dec-10-10 | | Oxnard: 23. Nxc6 then 23. … Qxc6 loses to Rd6+, so bxc6 but then 24. Rd7! and if Qxb3 25. Rxg7+ Kh8 26. Rxg6+ Rf6 27. Bxf6#. Hence 23. … Bxa1 only move but then 24. Nd8! looks very strong as it knocks the black queen off her king's diagonal, allowing the deadly revealed check (sacrificing the exchange loses very quickly too eg. 24. … Rxd8 25. Rxd8+ Kf7 26. Rf8+ Ke7 27. Re8+) for which I can safely declare winning without further analysis. |
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Dec-10-10
 | | agb2002: White is a pawn ahead.
Black threatens 23... Nxe5 and 23... Nxb4.
If the white knight disappeared then 23.Rd7 Re8 (or 23... Rf6; 23... Qxb3 24.Rxg7+ Kh8 25.Rxg6+ and mate in three) 24.Qxe6+ Rxe6 25.Rxg7+ Kf8 26.Rxb7 Rxe2 27.Bf6 and White should win the endgame. Therefore, 23.Nxc6: A) 23... bxc6 24.Rd7
A.1) 24... Qxb3 25.Rxg7+ Kh8 26.Rxg6+ and mate in two. A.2) 24... Re8 25.Rxg7+ Kf8 26.Qc3 + - [B+P].
A.3) 24... Rf6 25.Rxg7+ Kf8 (25... Kxg7 26.Qxe6) 26.Qxe6 Rxe6 27.Rxb7 Rxe2 28.Bd4 + - [B+P]. B) 23... Bxa1 24.Nd8 Rxd8 (otherwise the discovered check wins the queen) 25.Rxd8+ Kf7 26.Rf8+ Ke7 27.Re8+ wins. C) 23... Kh8 24.Rd8
C.1) 24... Qxb3(xc6) 25.Rxf8#.
C.2) 24... Rxd8 25.Bxg7+ Kxg7 26.Qxe6 + -.
C.3) 24... Qf7 25.Qxf7 + -.
D) 23... Ra8 24.Rd8+ and 25.Qxe6+ wins.
E) 23... Kf7 24.Rd7+ wins. |
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| Dec-10-10 | | gofer: White has created two threats, one along the a2-g8 diagonal and one along the a1-h8 diagonal. Both are real and verifiable.
However, Bg7 and oir own Ne5 is blocking one and Qe6 and our own Rd5 is blocking the other. Now Re5 is actually all part of
the plan, because of the discover check threat, but this only works if Re5 moves and gives check! However this can happen in
two ways; 1) Qe6 moves off the diagonal, 2) Rf8 captures on d8 and we then recapture on d8 with Rxd8+! 23 Nxc6 ...
Option 1 (ignore the threat on the a1-h8 diagonal)
++++++++++++++++++++++++++++++++++++++
23 ... bxc6
24 Rd7! Qxb3 (Qd5 and Qf7 don't help)
25 Rxg7+ Kh8
26 Rxg6+ mating
Option 2 (ignore the threat on the a2-g8 diagonal)
++++++++++++++++++++++++++++++++++++++
23 ... Bxa1
24 Nd8! Queen anywhere but f7 (Rxd8 Rxd8+ winning)
25 Re5 moves to attack the queen where ever it is now 25 Rc5+ (for 24 ... Qc8) winning
25 Re5+ (for 24 ... Qe8/Qe7/Qxe2) winning
25 Rxf5+ (for 24 ... Qf6) winning
Now there are other options where black ignores both diagonals! But these are so bad that
I am not going to look at them! (i.e. 23 ... Qxc6 24 Rd7+ etc) Time to check. |
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| Dec-10-10 | | gofer: Two days in a row where I have missed another defensive option! 24 Kh8 accepting loss of the knight is an option given the two alternatives, but after... 23 ... Nxc6
24 Kh8 Bxg7+
25 Kxg7 Nd4
White is a full knight up and a pawn up, so is losing badly, but that is still better than being mated or losing our queen! |
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Dec-10-10
 | | David2009: V Cmilyte vs E Boric, 2008 White 23? 23 Nxc6 seems to win quickly, main variation 23...bxc6 24 Rd7 Qxb3 25 Rxg7+ Kh8 26 Rxg6+ and mate in two. I have seen similar
mates before but not this particular game. Time to check the game and see if Crafty End Game Trainer can find anything better for
Black:
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In the puzzle position there is nothing better than the game line. In the resignation position Black can struggle on a piece down with 24...Rf6
etc. Rewind instead to the previous move:
click for larger view (V Cmilyte vs E Boric, 2008 White 22?)
After 22 Rxd5, Qe6?? is a blunder, instead 22...Qxg4 gives Black at least equality. If Black can unravel and exchange Rooks, his passed Pawn will become very strong. To my surprise and pleasure, I managed to draw as White first time against Cragty EGT (link http://www.chessvideos.tv/endgame-t...). Perhaps I am getting better. |
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| Dec-10-10 | | knight knight: White's a pawn up. Ok about ten minutes of thinking and I reckon 23. Nxc6 might be the move: a) 23...Qxc6 24. Rd6+ Kh8 25. Rxc6 winning
bi) 23...bxc6 24. Rd7 Qxb3 25. Rxg7+ Kh8 26. Rxg6+ mating bii) 23...bxc6 24. Rd7 Re8 25. Rxg7+ winning material c) 23...Bxa1 24. Nd8 will win the queen via discovered check, e.g. 24...Qe7 25. Rd7+ Kh8 26. Rxe7 Rxd8 27. Qf7 is actually mate soon d) 23...Kh8 24. Bxg7+ Kxg7 nope, let's try 24. Nd8 again. 24...Qe7 25. Bxg7+ Kxg7 (25...Qxg7 26. Ne6 Qa1+ 27. Kg2 remains a piece and pawn up)
26. Qd3 retains the piece and threatens 27. Rd7 pinning the queen e) 23...Re8 24. Nd8 Qe7 25. Bxg7 essentially the same as line d) There may be other defences, time to check... |
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| Dec-10-10 | | Boerboel Guy: Got it... and the Nd8 move!
Found the puzzle quite easy for a Friday. |
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| Dec-10-10 | | desiobu: I was way off track. I looked at Nf3 with the idea of Ng5, controlling e6 and f7, and preparing an exposed check with the hopes of winning the queen but h6 (or maybe something even better) pretty much ends that. |
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