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| Jan-22-15 | | sambo: Does anyone else agree that 22...Rxe6 spoils this, as shown by <gofer>? |
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| Jan-22-15 | | TheBish: J Sammour Hasbun vs A Ivanov, 2013 White to play (22.?) "Medium", White is down a piece for a pawn. While it is true that White is down material, for all practical purposes it is Black that is down! Undeveloped queenside and his queen offsides, and all of Whites pieces aimed toward Black's king... it's no wonder that White has a win. There may be more than one win here, but White must keep in mind that Black has ...Qa1+ as a defense, which would rule out 22. Rxg7. 22. Bf6! Rxe6
Not 22...Bxf6 23. Rxe8+ Nf8 24. Rexf8#, or 22...Nxf6 23. Qxf6! (23. Rxe8+ also works, as Black gets mated after 23...Nxe8 24. Rf8+ Bxf8 25. Qxf8#, but hangs around awhile after 23...Ng8) with dual mate threats, and after 23...Rg8 24. Rxg7 he gets mated very soon. 23. Bxg7+ Kg8 24. Bd4!
With the threat of 25. Rg7+ Kh8 26. Rxd7+ (or 26. Rxg6+). 24...Nf6 25. Rxf6 Qa3
As 25...Rxf6 26. Qxf6 is curtains, and also hopeless are 25...Bd7 26. Rf7 and 25...Re1+ 26. Kh2 Be6 27. Bxg6! hxg6 28. Rxg6+ Kh7 29. Qh5#. 26. Rxe6 Bxe6 27. Qf6 Qf8 28. Qh8+ Kf7 29. Qxh7+ Ke8 30. Qxb7 (or 30. Bb5+ first) Rc8 Or 30...Rd8 31. Bxg6+ Bf7 32. Qc6+ Rd7 33. Qc8+ Rd8 (33...Ke7 34. Bc5+) 34. Qe6+ Qe7 35. Bxf7+ Kf8 36. Bg7+! Kxg7 37. Qg6+! and mate next move. 31. Bb5+ Kd8 32. Qxa7 and Black is busted due to the threat of 33. Bb6+: If 32...Rc7 33. Qb8+! Bc8 (or 33...Rc8 34. Bf6+! Qxf6 35. Qd6+ Bd7 36. Qxd7#) 34. Qb6 (threat Bf6+) Bd7 35. Bf6+ Kc8 (or 35...Ke8 36. Qe6+) 36. Ba6+ Rb7 37. Qxb7#. If 32...Qe7 33. Bb6+ Rc7 34. Qa8+ Bc8 35. Qxd5+ Bd7 36. Qg8+ Be8 37. Qxe8+ Qxe8 38. Bxc7+ Kxc7 39. Bxe8 with an extra piece and several pawns. If 32...Qf7 33. Qa8+ Bc8 34. Qc6! with the threat of 35. Bxc7+ Qxc7 36. Qe8# which Black has no good answer to. |
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| Jan-22-15 | | mistreaver: Thursday. White to play. 22.? Medium?
It is very tempting to do the following:
22 Rxg7 Kxg7
23 Bf6+
but now i don't see how white proceeds after
23 ... Kf7
Maybe a reversed move order is better:
22 Bf6
And now:
A)
22 ... Nxf6
23 Rxe8+ Nxe8
24 Rf8+ Bxf8
25 Qxf8 is mate
B)
22 ... Rxe6
23 Bxg7+ Kg8
24 Bc3 (Maybe 24 Rf8+ also wins, but i am not certain after 24... Kxg7 25 Qf7+ Kh6)
And i don't see what black can do against double threat Rg7 and Rf8.
Time to check and see.
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Hmm, in general my calculation was good, but as other have already pointed out, in my A line 23 Qxf6! is the move one really should see. After
23 Rxe8+ Ng8 unfortunately
24 Rxg7 Qa1+
25 Bf1 Qxg7
26 Qxd5
is winning for white, but he still is a piece down and after
26 ... Be6 (apparently computer's first choice which says something about Black's position)
27 Qxe6 there still remains some work to do.
Of course, 24 Rxg7 is by no means forced, 24 Qxd5 wins easier, but it is still not immediate finish. |
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| Jan-22-15 | | Castleinthesky: My synapses must be firing up this week, I got this one pretty quickly, although a little differently. 1. Bf6 NxB 2. RxR+ NxR 3. Rf8+ BxR 4. QxB# |
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| Jan-22-15 | | TheaN: Thursday 22 January 2015 <22.?> White has already sacrificed a piece for pawn to set up a dangerous attack. As a result, the black queen and the queenside is outside of play. The bishop is the strongest piece, and at the moment the rook and knight are crucial defenders. If white allows black to retreat his queen and/or develop the queenside bishop, the game is probably over in black's favor. <22.Bf6!> is the key idea. Δ Rxe8+ & Bxg7+. Additionally it prevents Qa1+. The threat on the rook is the strongest, as <22....Bxf6? 23.Rxe8+ Nf8 24.Rexe8#<>> is mate. Similarly on g7 however, as <22....Rg8? 23.Rxg7!<>> sets up a windmill, if <23....Nxf6 (Rxg7 24.Re8+ Nf8 25.Rxf8#) 24.Qxf6 Bxe6 25.Rf7+ Rg7 26.Qxg7#<>>. The main replies revolve around capturing on e6 or f6. After <22....Nxf6 23.Qxf6!!<>> stresses the problems of the back rank. It is forced mate as <23....Rg8 (Bxf6 24.Rxe8#) 24.Rxg7 Bxe6 25.Rf7+ Rg7 26.Qxg7#<>> repeats the idea of 22....Rg8 23.Rxg7. The main line is probably <22....Rxe6>. The problem for white is that now black has full control over f6 and is a rook and bishop up. However, after <23.Bxg7+ Kg8 24.Bh6!!> Δ Rf8+; black has no reasonable defense against mate. White accomplished to dig in the black queen side. Setting up a defense on f6 fails: <24....Rf6 25.Qxf6! Nxf6 26.Rf8#<>>. Instead after retreating <24....Re8> white finally invades <25.Rg7+ Kh8 26.Qf7> and the only defense of e8 and h7 doesn't help <26....Nf6 27.Rxh7+ Nxh7 28.Qg7# 1-0>. |
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| Jan-22-15 | | TheaN: <sambo: Does anyone else agree that 22...Rxe6 spoils this, as shown by <gofer>?> Actually, no. I have to admit I missed that the combination of 23....Qa1+ and 24....Rf6 can be crushing IF white plays 24.Kh1. 24.Bf1!  and white's combination still wins; the bishop wasn't doing anything anyway. <22.Bf6 Rxe6 23.Bxg7+ Kg8 24.Bh6?! (24.Bc3 ) Qa1+ 25.Bf1! Rf6? 26.Rg7+ Kh8?! 27.Qxd5 > and white's pressure is just enough. |
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| Jan-22-15 | | Longview: I guess I had a different approach. I thought Bxg6 was the place to start followed by Qh5 unless hxg6. Then Rxg6. I saw the Qa1+ but Kh2 and Qe5+ is met with Rxe5 or g3 depending on what the move order was. Am I missing it?
Oh, I see it now, I am missing it. Qa1+ Kh2 Be5+ Rxe5 Qxe5+ Kg1 Rxe7 Rxe7 Qxe7 and white is down two pieces. I did not investigate black's followup after I moved out of check. Another novice blunder blowing a good position. I did not see the Bf6 move and probably would not have had the sense to take the Knight with the Queen and would have allowed the Qa1+ even then! <Castleinthesky> I like your ending best. |
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| Jan-22-15 | | patzer2: <sambo: Does anyone else agree that 22...Rxe6 spoils this, as shown by gofer?> Not me. After 22...Rxe6 23. Bxg7+ Kg8, Fritz 12 finds 24. Bd4! (diagram below) ,
click for larger viewwhen play might continue 24...Nf6 25. Rxf6 Qa3 26. Bxg6 hxg6 27. Rxe6 Bxe6 28. Qf6 Qf8 29. Qxg6+ Qg7 30. Qxg7#. |
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| Jan-22-15 | | patzer2: <TheaN> Didn't notice your last comment before posting mine about 22...Rxe6 23. Bxg7+ Kg8. Fritz indicates that after 22...Rxe6 23. Bxg7+ Kg8 your <24. Bc3!> is a crushing win. For 24. Bd4!, Fritz's first choice, the evaluation is + 21.22 @ 21/50 depth and 24. Bc3! is just about as strong. |
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| Jan-22-15 | | fokers13: longview why would you take on e5
play g3 and the Qh5 threat is still prevalent. |
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| Jan-22-15 | | agb2002: White has a pawn for a knight.
White can generate a double threat with 22.Bf6 (23.Rxe8+ and 23.Bxg7+): A) 22... Bxf6 23.Rxe8+ Nf8 24.Rexf8#.
B) 22... Nxf6 23.Qxf6
B.1) 23... Bxf6 24.Rxe8#.
B.2) 23... Rxe6 24.Qxg7#.
B.3) 23... Qa1+ 24.Qxa1 Bxa1 25.Rxe8#.
B.4) 23... Rg8 24.Rxg7 Rxg7 25.Re8#.
C) 22... Rxe6 23.Bxg7+ Kg8 24.Bd4
C.1) 24... Ne5 25.Rf8+ Kg7 26.Qf7+ Kh6 (the knight is pinned) 27.Be3+ g5 (or 27... Kh5) 28.Qxh7#. C.2) 24... Re5 25.Rxd7
C.2.a) 25... Bxd7 26.Bxe5 Rf8 (26... Be6 27.Qf6 wins; 26... Bf5 27.Qxd5+ Kf8 28.Bc4 Ke7 29.Qd6+ Ke8 30.Bb5+ Kf7 31.Qf6+ Kg8 32.Qg7#) 27.Qxd5+ Rf7 28.Bc4 Be8 29.Qe6 wins. C.2.b) 25... Re1+ 26.Kh2 Bxd7 27.Qf6 wins.
C.3) 24... Nf6 25.Rxf6 Bd7 (25... Rxf6 26.Qxf6 and mate in three) 26.Rxe6 Bxe6 27.Qf6 and mate in three. C.4) 24... Rf6 25.Rxf6 Qa5 (25... Nxf6 26.Qxf6 as above) 26.Rf7, threatening 27.Rg7+ and 27.Rxh7, wins. C.5) 24... Re1+ 25.Kh2 Ne5 26.Rf8+ Kg7 27.Qf6+ Kh6 28.Rh8, threatening 29.Qh4+, 29.Bxe5 followed by Qxg6#, etc., looks winning (28... Nxd3 29.Rxh7+ Kxh7 30.Qg7#). |
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| Jan-22-15 | | agb2002: I forgot
D) 22... Rg8 23.Bxg7+ Rxg7 24.Rxg7 Kxg7 25.Re7+ wins. For example, 25... Kh6 26.Qf6+ and 27.Rxh7#. Or 25... Kh8 26.Qf7 Qa1+ 27.Kh2 Qe5+ 28.Rxe5 Nxe5 29.Qf8#. |
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| Jan-22-15 | | Bycotron: Is 15...Nd7 as bad as it looks? I thought black was an amateur when I saw this move. When I scrolled back up and read Ivanov's name and the event, I had to scratch my head. |
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Jan-22-15
 | | perfidious: I have heard of a damp squib, but never a damp squab. Yet another POTD with both players being former opponents. |
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| Jan-22-15 | | Edeltalent: 22.? White to play
White has sacrificed a piece, in exchange he has very active pieces which all participate in the attack. Black on the other hand has half the queenside still undeveloped and the queen is far away. Not as much out of play as it looks though, as becomes apparent in the failed try 22.Rxg7 Qa1+ 23.Kh2 Qxg7. For precisely this reason, I'm strongly drawn towards 22.Bf6, because this makes the aforementioned maneuver impossible. Also it sharply challenges two of the few defenders of the black king. 22...Bxf6 23.Rxe8+ or 22...Nxf6 23.Rxe8+ Nxe8 24.Rf8+ or 22...Rg8 23.Rxg7 Rxg7 24.Re8+ lead to a quick mate. So Black has to try 22...Rxe6 23.Bxg7+ Kg8 24.Rf8+ Kxg7 25.Qf7+ Kh6. Can this really hold? It seems so; 26.Rh8 again runs into Qa1+, there's no check on f8, and White has not that many attacking pieces left. How to improve the variation? The idea and geometry behind 22.Bf6 just look so right... I couldn't really make it work, but the alternatives 22.Bxg6, 22.Rxg6 are not working either, and moving the Re6 or the queen seem slow. Then I saw 22.Qf6, which looks brilliant but is refuted by pretty much every halfway sensible black try. So I kept coming back to 22.Bf6 - by the way a strategy that can easily backfire in a real game; recalculating over and over again often doesn't change the assessment one bit and just gets you into time trouble. After dismissing 22.Bf6 Rxe6 23.Bxg7+ Kg8 24.Bh6 (because of 24...Qa1+ 25.Kh2 Rf6) and 24.Rxd7 (because of 24...Bxd7), I finally realized that it's not important to control f8. The black knight is doing too good a job defending it. The future of the white bishop lies on the long diagonal! He should move out of the way and support from behind, while rook and queen finish the job. The quiet 24.Bd4 threatens 25.Rg7+ Kh8 26.Rxg6+.
click for larger viewThe Bc8 would very much like to interpose on f5 now, but too many of his teammates block the way. 24...Ne5 25.Bxe5 or 24...Re1+ 25.Kh2 Ne5 26.Qf6 don't help. 24...Re5 seems best, after which 25.Bxe5 Nxe5 26.Rf8+ Kg7 27.Qf6+ Kh6 28.Qxe5 is good enough, but I have a feeling that 25.Bxg6, underlining the helplessness of Black, wins in a more difficult, but also more decisive and more aesthetic way. 
click for larger view25...hxg6 26.Bxe5 Nxe5 27.Rf8+ Kg7 28.Qf6+ Kh6 29.Rh8# |
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| Jan-22-15 | | BOSTER: < Abdel irada: 22.Bxf6 Nxf6 23.Rxe8+ Ng8, when Black survives>.
This is another statement to prove that it is important to understant the pos. before to say somethimg.
After 23...Ng8 24.Rxg8+ Kxg8 25.Qxd5 with the threat Qd8 and discovered check.
If 25...Qa1+ 26.Bf1 Qe5 27.Rxg7+Kxh7 28.Qxe5 and White win. |
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| Jan-22-15 | | BOSTER: Should read 27...Kxg7, but if Qxg7? |
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Jan-22-15
| | perfidious: <BOSTER: < Abdel irada: 22.Bxf6 Nxf6 23.Rxe8+ Ng8, when Black survives>.
This is another statement to prove that it is important to understant the pos. before to say somethimg.> Methinks our learned friend <does> understand here. |
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Jan-22-15
 | | Penguincw: My moves were 22.Bf8 Rxe6? 23.Bxg7+ Kg8 24.Rf8+? Nxf8?? 25.Qxf8# 1-0. However, something as simple as 22...Rxf8 can stop all of that. |
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| Jan-22-15 | | gofer: <patzer2:> and <sambo> <sambo: Does anyone else agree that 22...Rxe6 spoils this, as shown by gofer?> <Not me. After 22...Rxe6 23. Bxg7+ Kg8, Fritz 12 finds 24. Bd4! (diagram below)>> I found <24 Bd4> too, which I felt was clearly winning for white. I wasn't saying that <22 ... Rxe6> was disproving <22 Bf6>. I just felt it was probably the best defence. <22 ... Rxe6> is/was still a losing defence!!! |
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| Jan-22-15 | | CHESSTTCAMPS: White is a piece down for a pawn, but black is giving the odds of the unmoved rook and bishop, while white has all pieces deployed in a way that each performs a useful function. The black queen is rather far afield, but is in position to get back to the defense of the king if white blunders, e.g. 22.Rxg7?? Qa1+ 23.Kh2 Qxg7 and white is a rook down with no attack. But what if white seizes the long diagonal first? 22.Bf6!! allows multiple captures by black, but none is satisfactory: A. 22... Nxf6 23.Rxe8+ Nxe8 24.Rf8#
B. 22... Bxf6 23.Rxe8+ Nf8 24.R8xf8#
C. 22... Rxe6 23.Bxg7+ Kg8 24.Bd4! (the forcing 24.Rf8+? Kxg7 25.Qf7+ yields a piece that is needed to finish) with the major threat of Rg7+, and now: C.1. 24... Ne5 25.Rf8+ Kg7 26.Qf7+ Kh6 27.Be3+ g5 (Kh5 28.Qxh7#) 28.Qxh7+ Rh6 29.Qxh6# C.2. 24... Re1+ (to prevent Be3+ as in above) 25.Kh2 Ne5 26.Bxe5+ Rxe5 27.Qf6 forces mate. C.3. 24... Qa6 25.Rg7+ Kh8 26.Rxg6+ Ne5 27.Bxe5+ Rxe5 28.Qf6# C.4. 24... Qe1+ 25.Kh2 and black can do no better than transpose to C, C.1, and C.2 lines. Note that in C, 24.Bh6? fails against 24... Qa1+.
Time for review... |
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| Jan-22-15 | | CHESSTTCAMPS: Not only did I declare mate a little early in A, I also missed the importance of the queen sac that finishes the game! As the thorough analysts have shown, the most analysis work is after the defense 22... Rxe6. In my case, I spent a fair amount of time on 24.Bh6, in spite of knowing the strategic importance of the long diagonal. A fine puzzle - better work needed next time... |
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| Jan-22-15 | | BOSTER: <perfidious: our learned friend <does> understand here>. According to <our learned friend> with 23...Ng8! <Black survives>. Thanks to Dan Heisman I decided to change the moves order. So, I play 24.Qxd5(diagram),and ask him to show how <Black survive>
click for larger view |
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| Jan-22-15 | | patzer2: <Gofer> My apology for not first checking your original post about <22...Rxe6 23 Bxg7+ Kg8> before responding to <Sambo>'s post. We both initially conclude 24. Bd4! is clearly decisive here, so I have no disagreement with your analysis of this line. |
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| Jan-27-15 | | Abdel Irada: <BOSTER>: Your analysis is correct, in that White reaches a winning endgame after the exchanges following 24. Qxd5, Be6. I do not, however (and please note that this is my analysis; an engine might find some combination I have overlooked), and that is the sense in which I meant that Black survived. What this means is that, as is often true in these puzzles, there are various ways to win, but if we are looking for elegance or efficiency, the queen sac commends itself. ∞ |
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Kibitzing
sac: 18.Bxd6