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Oct1211   pogotheclown: I spotted this one within about 90 seconds,although I went with Nf6+. I noticed 41...Kg8 which drags it out a bit longer but White is clearly winning so I couldn't be troubled to analyze it to the end. 

Oct1211   zb2cr: The White Rook down at g1 is the key to the position. Just have to see that you can clear away the deadwood with 40. Qxh5+! Black can decline in two ways:
a. 40. ... Kg8; 41. Qxg6 and White is up by two Pawns and threatening Nf6+ to bring the Knight into the attack. b. 40. ... Bh6 is even worse. 41. Qxg6+, Kh8; 42. Qxh6+, Qh7; 43. Qf6+ and mate next move. The main line is acceptance of the Queen with 40. ... gxh5; 41. Nf6+. Now it's mate in three. a. 41. ... Kh8; 42. Rh5+ and White delivers an Arab mate after two useless interpositions. b. 41. ... Bxf6; 42. Rxh5#.
c. 41. ... Kh6; 42. Rxh5#. 

Oct1211   srag: <Phony Benoni>: " ... I once played a positional move, back around 1982. I'll try not to let that happen again". A very funny remark! By the way, your are sixty or turning sixty: welcome to the club! 

Oct1211   CHESSTTCAMPS: White has a centralized knight for a bishop and major pieces that are far more active than the black counterparts. The setup offers a spectacular way to destroy the black king's pawn shelter: 40.Qxh5+!!
The queen can't be taken. Less certain is 40.Nf6+?!? Bxf6 41.Qxh5+ Kg8 42.Qxg6+ Bg7 43.Qe6+ Qf7 44.Rxg7+ Kxg7 45.Rg5+ Kf8 46.Rf5 Rc7 where the active Q + 2Ps offers winning chances. But this is an unnecessary risk. A) 40... gxh5 41.Nf6+! Kh8 42.Rxh5+ Bh6 43.Rxh6+ Qh7 44.Rxh7# A.1) 41... Bxf6 (or Kh6) 42.Rxh5#
B) 40... Bh6 41.Qxg6+ followed by 42.Qxh6(+)
C) 40... Kg8 41.Qxg6 Qf7 42.Qxf7+ Kxf7 43.Ra7+ wins.
C.1) 41... Rd7(/Rd8) 41.Nf6+ wins
C.2) 41... Kh8 42.Nf6 wins.
C.3) 41... Kf8 42.Rf1+ Kg8 43.Nf6+ Kf8 44.Nh5+ Kg8 45.Nxg7 Qxg7 46.Qe6+ Kh7/h8 47.Rh5+ wins. Time for game review... 

Oct1211   CHESSTTCAMPS: Try playing the puzzle position against Crafty EGT: http://www.chessvideos.tv/endgamet... This is a chance to try the inaccurate 40.Nf6+!? line. 

Oct1211   abuzic: ?What would black play after 40.Qxh5+ Kg8 41.Qxg6
White is threatening:
Qe6+ Qh7+ Nf6+
41...Rf8 42.Qe6+ Kh8 43.Ne7 now white threatens Ng6+ Qh3+ Rh5+ and is watching the c8 square. Black to delay mate can sacrifice with 43...Qxg1+ 44.Kxg2 Bd4+ 45.Kg2 Rf2+ 46.Kg3 black is powerless;41...Rd7 42.Qe6+ Kh8 43.Nb6 Rc5 44.Qe8+ or Rb3 black is hopeless 41...Rxc4 42.Qh7+ Kf8 <(42...Kxh7 43.Nf6+ Kh8 44.Rh5+ Bh6 45.Rxh6+ Qh7 46.Rxh7#; 42...Kf7 43.Qxg7+ Ke6 44.Nf4#)> 43.Rf1+ Qg8+ 44.Qxg7+ Kc5 45.Qxa7...finitto 41...Rc1 42.Qf6 Re8 43.Rb8 Rcc8 44.Rxc8 Qxg1+ 45.Kxg1 Bxf6 46.Nxf6+ and that's it.. 

Oct1211
  kevin86: A brilliant conclusion! Black is forced to open the door to the mate by white's rooks/knight. 

Oct1211
  JustAFish: I see why Qxh5+ is better. In a practical game, however, I would likely have played Nf6+ 'cause I've been burned too many times by bad combinations and Nf6+ minimizes the potential damage. 

Oct1211   Treestar: I was about to post a colourful description of the onslaught after <40.Nf6+ > when I double checked & then saw the sobering resource of black’s king sidestepping to g8 and using B or Q on g7 as a shield.
It seems to be a choice between <Nf6+> and <Qxh5>. The latter seems safest the Q cannot be taken on account of <hxg5, 41.Nf6+> then <Bxf6 is met with Rxh5# >or <Kh6 Rxh5#> or <Kh8 42.Rxh5+, Bh6 43.Rxh6+,Qh7 Rxh7#>
So <40.Qxh5+ Kg8 41. Qxf6> netting white 2 pawns. Try <Nf6+ Bxf6 Rxh5+ Kg8> and the king survives leaving black better. No more time on the clock to go any deeper so Qxh5 I guess. 

Oct1211   BOSTER: It's nice to see that h5 is the point of intersection diagonal d1h5 and 5 th rank, using another words the place to meet rook b5 and queen e2 you can not change.
And if g6 pawn disappeared ,the black king would be cut from all world after Nf6+.
So 40.Qxh5 gxh5 41.Nf6+ Bxf6 42.Rxh5 # is the main line. 

Oct1211
  doubledrooks: White pries open Black's kingside pawn shield with 40. Qxh5+. For example: 40...gxh5 41. Nf6+ Kh8 42. Rxh5+ Bh6 43. Rxh6+ Qh7 44. Rxh7# 

Oct1211   jackalope: I obviously meant 40... Kg8  that's what happens when trying to solve these at 2 a.m. After playing this out against an engine, I see Kg8 only delays the inevitable. 

Oct1211   LIFE Master AJ: Looked at this one a long time, at elast 5+ minutes, maybe a bit more. At first I was looking at 40.e5, but then I finally saw the real idea. 40.QxP/h5+! 

Oct1211   abuzic: I must correct my post:
<abuzic: ?What would black play after 40.Qxh5+ Kg8 41.Qxg6?What would black play after 40.Qxh5+ Kg8 41.Qxg6.......
41...Rc1 etc.>
The last variation should be:
41...Rc5 42.Qf6 Re8 43.Rb8 Rcc8 44.Rxc8 Qxg1+ 45.Kxg1 Bxf6 46.Nxf6+ and that's it.. 

Oct1211   Samagonka: I missed yesterday's puzzle, can someone help me to relocate? 

Oct1211   Mikey00004: tho 40. Qxh5+ is much more accurate. with correct play 40. Nf6+ is also winning just taking a little bit longer. 

Oct1211
  Sastre: <Samagonka> Kupreichik vs Tseshkovsky, 1976 27.? White to play. 

Oct1211
  chrisowen: Battle f5 star 35th set hope Viktor back game genesis. 

Oct1211
  agb2002: White has a knight for a bishop.
The rook on g1 would confine the black king to the hfile if the black bishop and the pawn on g6 disappeared or were diverted. This suggests 40.Nf6+, to divert the bishop and to open the fifth rank to the rook on b5: A) 40... Bxf6 41.Qxh5+ Kg7 (41... gxh5 42.Rxh5#) 42.Rxg6+ Kf8 (42... Kf7 43.Qh7+ wins the queen at least) 43.Rxf6+ Kg7 (43... Ke7 44.Qf7#; 43... Kg8 44.Rg5+ Qg7 45.Qf7+ and 46.Qxg7#) 44.Qh6+ Kg8 45.Rg5+ Qg7 46.Q(R)xg7#. B) 40... Kh8 41.Qxh5+ gxh5 (41... Bh6 42.Qxh6+ Qh7 43.Qxh7#) 42.Rxh5+ Bh6 43.Rxh6+ Qh7 44.Rxh7#. C) 40... Kh6 41.Q(R)xh5+ gxh5 42.R(Q)xh5#.
White must check continuously because Black has the resource ... Qxg1+ which might invalidate the combination. Finally, 40.Qxh5+, instead of 40.Nf6+, might be easier to calculate. For example, 40... Bh6 (40... gxh5 41.Nf6+ transposes to previous lines) 41.Qxg6+ Kh8 42.Qxh6+ Qh7 43.Qf6+ Qg7 44.Qxg7#. 

Oct1211
  agb2002: In my rush, I forgot the other king move in line A:
41... Kg8 42.Qxg6+ Bg7 (42... Qg7 43.Qxf6 + ) 43.Rh5 with a winning attack. For example, 43... Rc7 44.Qe6+ Rf7 45.Rxg7+ Kxg7 46.Qh6+ Kg8 47.Qh8#. Or 43... Kf8 44.Rf1+ Kg8 45.Qe6+ Qf7 46.Qxf7#.
Or 43... Qxg1+ 44.Kxg1 Rc7 45.Qe6+ Rf7 46.Rf5 Rdf8 47.Rxf7 Rxf7 48.Qxd6 +  [Q+2P vs R+B]. Definitely, 40.Qxh5+ is much better than 40.Nf6+, but the latter also wins. 

Oct1211   BiteByBits: I chose 40. Nf6+ because I saw that the knight couldn't be taken first. I saw that Qxh5+ was equally winning but thought that the win was more complicated if black plays Kg8 declining the sacrifice. 

Oct1211   CHESSTTCAMPS: <agb2002> <Definitely, 40.Qxh5+ is much better than 40.Nf6+, but the latter also wins.> Agreed. The key move (after 41... Kg8 42.Qxg6+ Bg7) is 43.Rh5, an improvement over 43.Qe6+ Qf7 44.Rxg7+, suggested by <gofer> and <CHESSTTCAMPS>. The best Crafty EGT can come up with is 43... Qxg1+, with white up Q+2Ps for R+B, an easy win. 

Oct1211   stst: Quite some variations, yet a N sac seems to be in order:
40.Nf6+ BxN (if not, after Rxh5+, PxR, Qxh5#)
41.Rxh5+
IF (A)41....PxR, 42.QxP#
IF (B)41....Kg7, 42.RxP+ KxR (if Kf7, 43.Rh7+ & Q is lost.)
Still under (B)43.Qg4+ Kf7, 44.Rh7+ & Q lost. 

Oct1311   TheBish: Bologan vs E Van Haastert, 2005 White to play (40.?) "Medium/Easy", even material.
My first hunch was 40. Nf6+, but that doesn't quite work unless Black plays into your hands (40...Bxf6 41. Qxh5+ gxh5?? 42. Rxh5#). Don't have time for the details, but Black defends after 41...Kg8 42. Qxg6+ Bg7. 40. Qxh5+!!
My first impression was that this doesn't work, but it does. 40...gxh5
Else White wins routinely after 40...Kg8 41. Qxg6.
41. Nf6+ with a forced mate.
Just under the wire, I think. 

Oct1311   sevenseaman: 40. N40+ is a very natural looking move. Qxh5+ is counterintuitive and very tough to choose. The response gxh5 is the most natural. 41...Kg8 (in both cases) can be played only after deep analysis. The best advice on this site has been left by <CHESSTTCAMPS>. Try Crafty, it clears all the cobwebs. 

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