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| Apr-12-12 | | MarkFinan: Sac the Queen for the Bishop, and the h pawn cannot be stopped.. This seems really easy, so perhaps im wrong?
And black can cause white a few "problems" i guess, with Rxa2? But i dont see no mate thanks to the knight.. In fact that Knight is protecting some key squares even though it looks ugly.. |
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Apr-12-12
 | | sevenseaman: <M.Hassan>
<25.hxg6
<if...fxg6 26.Qxf5 and Bishop is lost> <if...Bxg6 26.Rxg6 and bishop is lost>25............Bxc2+
26.Kb2 Bxd1
27.g7+ Kg8
28.Qxf7+! Kxf7
29.g8=Q+ Kf6
30.Qe6# >
Your idea is quite good. I had tried this and it nearly worked. The defense against it goes like this; <25. hxg6 Bxc2+ 26. Kb2 > (Ka1 is worse)<26...Bxg6 27. Rxg6> (better than 2. h5) <27...Qa5 28. Qh6+> (best, I tried other things too) <28...Ke8> and now White does not have any resource to stall Black mating him. Say; <29. Rg8+ Kd7 30 Qh8> (waste of a tempo cannot be helped) <30...Qa3+ 31. K. ~ Rxc1+> and mate follows. This is the reason <25. Qxf5> is a genius move as it takes care of the LSB too. Coasting around, I kind of wandered into this wonderful idea (my 4th). If you read my first post again I have emphasized the danger posed by the Black LSB. But <Hassan>, a sincere good effort, I must say. As usual, I am all eyes when I see your post. <SimonWebbsTiger> Thanks for wising us up on Mikhalchishin. He must be a good thinker of the game. |
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Apr-12-12
 | | Shams: White's 19th is a more interesting puzzle-- why does he not keep the bishop? <ToTheDeath> gives the line below, in a post dated Jul-14-09. |
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| Apr-12-12 | | LoveThatJoker: Here's an excellent companion game to this one, won by Shirov three days ago: Shirov vs D Sitnikov, 2012
LTJ |
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Apr-12-12
 | | agb2002: White has a knight and a pawn for a bishop.
Black threatens 25... Bxc2+.
The pawn on g6 is overburdened: it protects the bishop and provides a shelter for the black king on g8 if White plays h6. Therefore, eliminate the threat and open the g-file with 25.Qxf5: A) 25... gxf5 26.h6 seems to win. For example, 26... Qc5 27.h7 Ke8 28.h8=Q+ Kd7 29.Rg2 + - [N]. B) 25... gxh5 26.Qxh5 + - [N+P]. |
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Apr-12-12
 | | morfishine: <25.Qxf5> and the h-pawn cannot be stopped <MarkFinan> Nice work |
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| Apr-12-12 | | Limpin Kt: Hmmm, good puzzle. 25.Qf5! gf 26.h6! Winning. The solution is kinda obvious as other white pieces are slumbering. |
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| Apr-12-12 | | Limpin Kt: <markfinan>> excellently remarked on the position of knight. Your comment actually made me remember what <vishy anand> remarked on sic queenside castling. He wrote, the knight is required on c1 for the defensive purposes against the queenside attack by black. |
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Apr-12-12
 | | whiteshark: <25.Qxf5!> and that's it. |
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| Apr-12-12 | | fokers13: 4/4 this week and quite easily to boot.
Wondering what F-S-S have in store for us. |
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| Apr-12-12 | | solskytz: Almost the moment I saw it I thought - well hey, super GOOT A-la <once> Queen takes f5, then pawn to h6. You have two moves. What do you do? Ab-so-lute-ly nothing! So much heavy force there at the Q side, and so badly disorganize! Queen and rooks just don't work together this way! And what with the c1 knight, covering a2... A Queen sacrifice just accentuates the grotesque in Black's attack planning... like - hey, I'm rid of the queen, now what are you going to do with all of that material? Hehe |
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| Apr-12-12 | | zb2cr: I got this one in a matter of seconds; only because I had seen something like it before. What? Not quite sure, but the key idea--Queen sacrifice to clear a pat for quick Pawn promotion--was there. |
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Apr-12-12
| | sevenseaman: Today's POTD, one whopping move and the game belonged to White. OTB it ought to be rated a really good move that turned the tables. Here one whopping move and White bags the game . Our advantage; we know there is a tactical shot. 
click for larger viewWhite.
I wish I could tell you which real game it is from. |
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| Apr-12-12 | | LoveThatJoker: <sevenseaman>
<1. Nf6! Ne2+>
(1...Bxf6 2. Qxf7#; 1...Rxd7 2. Nxd7+ Ke7 3. Nxb8  ; 1...c4 2. Qg8#) <2. Kf2>
LTJ |
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Apr-12-12
 | | WinKing: A nice sacrifice of the queen cuts off any possible assistance by black's king to stop the pawn from running. 25.Qxf5! gxf5
26.h6 - <(No way to stop it from queening)> Interesting also is 25.hxg6 which looks good for white. A possible line might be: 25.hxg6 Bxc2+
26.Ka1 Bxg6
27.Rxg6 Qa5
28.Rg2
Looks pretty convincing. |
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| Apr-12-12 | | KingV93: Guessed this one right away. With the  sac opening the file that blocks off the  from the pawns it looks like White will definitely promote. |
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Apr-12-12
| | sevenseaman: <LoveThaJoker>
Nice and comprehensive!
I should have known there are quality solvers prowling the ramparts. This may perhaps give you some exercise, just may. < 
click for larger view White. |
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| Apr-12-12 | | et 9: i hate these kind of positions. Black has all kinds of hard-to-see advances even sacrifices whereas white has to use several tempos to get his attack coordinated. White could wind up queening a pawn only to have black checkmate 2 moves later. i love these positions in club games but not games that affect rating points. I went with 25.hxg only because i saw white won in the results and it looked like white was defending himself adequately. The queen sac never even crossed my mind. |
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| Apr-12-12 | | et 9: Yeah. My intuition was right but i ignored it. Leaving the pressure on c2 allows black to sac and maintain initiative and finally mate whereas the text move takes the pressure off of white's king and easily wins another queen via promoting. |
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| Apr-12-12 | | CHESSTTCAMPS: In this middlegame attacking position, white is up a pawn, but black (at first glance) appears to have a strong attack with 2 pieces htting the lightly defended c2. In fact, white's tortoise pawn structure (plus Nc1) defends the king position very ably, with the black queen in a poor position to contribute quickly to black's attack. It is white who has the winning breakthrough. 25.Qxf5!! eliminates black's best placed attacking piece and sets the h-pawn free. 25... gxf5 26.h6 and now black's overcommitment of the major pieces to the attack leaves no defensive resources to stop the tempo-gaining h7: A) 26... Rxc2 (a desperate try) 27.h7! Rxc1+ (Rb2+ 28.Kxb2 is no better) 27.Rxc1 Qd3+ 28.Rc2 and black can't meet the double threat of 29.Rg8# and 29.a8=Q+. B) 26... e6 (or Ke8) 27.h7 and white queens with an extra piece in hand. C) 26... Rxa2 27.h7! is again the quickest win.
Time for review.... |
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Apr-12-12
 | | Once: Funnily enough, Fritz prefers 25. hxg6 to 25. Qxf5. Both seem to win handily. 25. Qxf5 was my pick, threatening both the h pawn promotion and h6-h7-Rg8#. Black is overcommitted on the queenside and cannot scurry back in time to help. |
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| Apr-12-12 | | LoveThatJoker: <sevenseaman> Solved instantly: 1. Rxa7+ Rxa7 2. Rxa7+ Kxa7 3. Bxb8+ Rxb8/...Kxb8 (3...Kb7 4. Na5+ wins) 4. Qxc6 wins LTJ |
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| Apr-12-12 | | erniecohen: <<sevenseaman>: The defense against it goes like this; <25. hxg6 Bxc2+ 26. Kb2> (Ka1 is worse)<26...Bxg6 27. Rxg6> (better than 2. h5) <27...Qa5 28. Qh6+> (best, I tried other things too) <28...Ke8> and now White does not have any resource to stall Black mating him. > I don't think so. After 28.  g2, there is no mating attack for Black. This problem is cooked; 25. hxg6 is at least as strong as 25. xf5. |
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| Apr-12-12 | | pogotheclown: Qxf5 was the first move I looked at and I didn't have to look for another. After gxf h6 black has not time to work up an attack or suck the white king into the open. Easy for a Thursday. |
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Apr-12-12
| | Once: <erniecohen: ... This problem is cooked; 25. hxg6 is at least as strong as 25. xf5.> Yup - it does look that way. For that matter, Fritz also sort of likes a slow build up with 25. Rd2 and 25. Rg2. Both eval around +2, which is normally enough for a win. But that's the thing with the POTDs. They're taking from real games so some of the normal rules of chess puzzles don't quite apply. Sometimes there are multiple solutions. I don't see them as cooks. Just part of life's rich tapestry. I've often dreamt that one day CG.com will even give us a Kobayashi Maru problem ... http://en.wikipedia.org/wiki/Kobaya...
... ie one that can't be won and where the best move is to resign. |
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