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| Jan-15-10 | | agb2002: <johnlspouge: < <An Englishman> wrote: Good Evening: This was a little too easy for the latter half of the week; [snip] > While I agree that the puzzle candidate 30.Bd5+ was totally transparent, careful analysis to a win seems much more difficult.> Another detail making things more complex was Black's intermediate Qd3+ protecting the pawn on g6 in some lines. <"Easy" therefore depends very much on what one calls a solution.> After 30... Kf8, I had the impression that White should settle for recovering the material while keeping some initiative. This could be a solution for me (but perhaps not for others) in this particular case because of the number and depth of the lines and the various transpositions. |
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Jan-15-10
 | | OBIT: I agree with the posters saying that 30. Bd5+ is rather obvious, the only move worth considering. In the game continuation, more thought is required for moves 32 and 33. At move 32, for example, I don't think 32. Bh6+ works because of 32. Bh6+ Ke8 33. Qxh8+ Kd7 34. Qg7+ Kd6 35. Qxg6+ Kc7 36. Qg7+ Kb8 and the king escapes. By comparison, after 32. Qxh8+ Kf7 33. Qh7+ Ke6 34. Qxg6+ Kd7 36. Rh7+ simply mates (hmm, good thing the bishop wasn't on h6), or 32. Qxh8+ Ke7 33. Qg7+ (33. Bg5+? is another red herring, as after 33...Kd6 34. Qf6+ Kc7 the king escapes -- as will be seen, the bishop needs to stay on d3) Kd6 34. Qxg6+ Kc7 35. Qg7+, and, aha, with the bishop still on d3, now 35...Kb8 loses to 36. Qa7#. And then there is move 33, when 33. Rh7+ certainly looks like the move we'd all play in blitz. However, after Black replies with 33...Ke6 (his only legal move), how does White continue? These are the kinds of attacks that backfire badly when we don't bother to look one move ahead. The puzzle is a good exercise in attacking chess, since finding the moves to maintain the initiative take some thinking ahead. Maybe move 32 would have been a better place to start the puzzle. Or, maybe there is a truly insane puzzle at move 27, when 27. Rxd5!!? initiates a go for broke attack. (Hey, is 27. Rxd5 actually sound?) |
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Jan-15-10
 | | chrisowen: The Bd5+ sacrifice puts Boris on the altar man. Down material reading an attack is gospel, book lines suggest deflecting the defender. Rc8 incenses the sac of the bishop. Bd5+ Qxd5?! Qxh7+ Kf8 Qxh8+ Kf7 Qh7+ Kf8 Bg5! As white does mass his pieces around the cornerstone h8 he seeks sanctuary in the queenside. It seems 30..Kf8 is the line now clothing him with a defence. Qxf3!? Qh8+ Kf7 Rh7+ Ke6 and the king is constant in ebbing away. Say a prayer for black Re7+ Kd5 Qxe5+ Kc4 Qd4#. The body and blood of white's play holds the win every step of the way since bishop in. |
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| Jan-15-10 | | patzer2: For today's Friday puzzle (30. ?) White plays the decoy sham sacrifice offer 30. Bd5+!, which, as <Kakarot> notes on page 1 of the kibitizing here, is actually an essential follow-up to the interesting decoy sacrifice 27. Rxd5!? White is down material after his initial sacrifice (i.e. 27. Rxd5!? Qxd5), and now must find another sacrifice to justify his initial investment and maintain the advantage. What Black must not do is immediately play 30. Bxc6??, when Black with an extra piece and no significant weaknesses has a winning advantage after 30...Rxc6  . Instead, White has to make an in-between move (a.k.a zwischenzug or intermezzo) before capturing with 30. Bb5+!, when after best play of 30...Kf8 31. Bxc6 Rxc6 32. Qxh7 Qxh7 33. Rxh7 Bg7  he has a strong endgame advantage (extra pawn and two isolated Black pawns to attack). However, as <al wazir> notes, the game is "far from over" at this point. However, after Black takes the bait with 30...Qxd5?? it would appear White has a winning attack after the forcing 31. Qxh7+! Kf8 32. Qxh8+ Kf7 33. Qh7+! (a strong and forced move because other alternatives lose) 33...Kf8 34. Bg5  (Fritz 10, 2-cpu, +3.48 @ 20 depth). P.S. Interestingly, while 27. Rxd5!? (the initial move of White's combination) may be "sound" in the sense that it yields an endgame advantage with best play, it is not objectively the best move here. Instead, as <Random Visitor>'s Rybka analysis indicates, 27. Bg5! and 27. Be3! are both "winning." |
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| Jan-15-10 | | ZZer: And if Black plays 30... Kf8 instead of taking the Bishop? Would White still win the game? |
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| Jan-15-10 | | patzer2: <ZZer: And if Black plays 30... Kf8 instead of taking the Bishop? Would White still win the game?> I'm not sure. White has an extra pawn and connected pawns versus two isolated Black pawns, but converting it to a win in practical OTB play could be very difficult. However, if a forced win could be proven, then it might justify White's initial sacrifice 27. Rxd5!? as being completely sound (i.e. 27. Rxd5!!). |
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| Jan-15-10 | | tivrfoa: An interesting puzzle is 27. Rxd5!!! xD |
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| Jan-15-10 | | YouRang: I found the first moves, but I was expecting 30...Kf8, which seems to lead to a drawish pawn-up game for white. 30...Qxd5?! seems to allow a very strong kingside invasion where white ends up with Q+R+B pouncing on an exposed king whose defenders are on the other side of the board. I didn't even give it much consideration because I thought it had 'king hunt' written all over it. |
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| Jan-15-10 | | wals: Gennadi Kuzmin - Boris Alterman,
Analysis by Rybka 3 1-cpu: time 5 min depth 15 hash 3071mb 1. (1.18): 30...Kf8 31.Qxh7 Qxh7[] 32.Rxh7 Bg7[] 33.Bxc6 Rxc6 34.a3 Kg8 35.Rh3 e4[] 36.Kc2 exf3[] 37.Rxf3 Rd6[] 38.Rf4 Rd7[] 39.Rf2 Rd8[] 2. (3.25): 30...Qxd5 31.Qxh7+[] Kf8 32.Qxh8+[] Kf7 33.Qh7+[] Kf8 34.Bg5[] Qd6 35.Qh8+ (, 16.01.2010) |
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Jan-15-10
| | OBIT: Going by the Rybka analysis in an earlier post (mentioned by <patzer2> a few posts up), on move 27 White has easier solutions than 27. Rxd5, those being 27. Be3 and 27. Bg5. Yeh, looking at 27. Be3, it does seem like a much less speculative way to keep the advantage. |
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| Jan-15-10 | | RandomVisitor: <Utopian2020>and I have both looked at 29...Raa6, which appears to cast a shadow on the 27.Rxd5 sacrifice. After 29...Raa6!
click for larger view Rybka 3:
<[-0.79] d=19 30.Bd5+> Re6 31.Bc5 Bf6 32.Qh6 Qf7 33.f4 exf4 34.Qxf4 Kg7 35.Qh2 Kh8 36.g5 Be5 37.Qg2 Qd7 38.Qh3 Red6 39.Bxd6 Rxd6 40.Qxd7 Rxd7 41.Bc6 Re7 42.Bxb5 a3 43.bxa3 Kg7 [-1.29] d=19 30.c4 Rd6 31.cxb5 Rd1+ 32.Rxd1 Qxd1+ 33.Bc1 Rd6 34.Qc2 Qxc2+ 35.Bxc2 Bf6 36.b3 axb3 37.Bxb3+ Kg7 38.a4 Rd3 39.Bc2 Rd4 40.Be3 Rb4+ 41.Ka2 e4 42.Bxe4 Be5 43.g5 Rxa4+ 44.Kb3 Ra5 45.Kb4 |
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| Jan-15-10 | | YouRang: <A Karpov Fan: got it
i think 32.Bh6+ wins too
>
I don't see it: 32.Bh6+ Ke8 33.Qxh8+ Kd7 and how now? |
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| Jan-15-10 | | VincentL: In this "difficult" position I wasted at least 10 minutes thinking it was black to play. It is apparent that white has sacrificed a rook, and this remains the material imbalance, save that white has one pawn more. White can play 30. Bxc6, but after 30.....Rxc6, how to continue? I think the correct start may be 30. Bd5+ Now if 30....Qxd5 31. Qxh7+ Kf8 32. Qxh8+ Ke7 33. Bg5+ Kd7 34. Rh7+ Kd6 35. Be7+ Kc7 I am not finding the mate, and there are other defences also. I am out of time, and am going to check. |
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| Jan-15-10 | | VincentL: Well, my first moves are as in the game. But does this work against all defences? It did not for me - time to read the other posts (which will doubtless include computer analysis). |
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| Jan-15-10 | | johnlspouge: < <YouRang> wrote: <A Karpov Fan: [snip] i think 32.Bh6+ wins too > I don't see it: 32.Bh6+ Ke8 33.Qxh8+ Kd7 and how now? > I also had hopes for 32.Bh6+, but computer analysis dashed them. (See my post below.) There is no need to think: as usual, you can use a computer ;>P |
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| Jan-15-10 | | David2009: <YouRang: I found the first moves, but I was expecting 30...Kf8, which seems to lead to a drawish pawn-up game for white.>. <Patzer2>, <VincentL>, <ZZer> make similar points. I have had an interesting afternoon trying to win this ending against Crafty (link in my first post
G Kuzmin vs B Alterman, 1989). I only win when/if Crafty inexplicably throws
away the draw late in the ending: in my early attempts I found Crafty winning by active defence. White's Q side Pawns
turn out to be very vulnerable to an early attack by a3!. Starting from the moves 30...Kf8 31.Qxh7 Qxh7 32.Rxh7 Bg7 33.Bxc6 Rxc6 we reach: 
click for larger view
Now 34.Bh6 Bxh6 35.Rxh6 Kg7 36.Rh1 a3 37.Kc2 Rf6 38.Rf1 e4 39.f4 axb2 40.Kxb2 e3 and White has nothing;
34. Kc2 b4! followed by a3 and Black has excellent compensation;
The only real try seems to be Bd2 forestalling/ protecting b4/a3. Crafty continues 34...Kg8 35.Rh1 a3 36.bxa3 Rf6! (better than Ra6 immediately).
click for larger view
Now 37.Rf1 leads to a draw after Kf7 38.Kc2 e4 39.f4 Ra6 40.Bc1 Ra8 41.f5 Rc8 42.f6 Bxf6 43.g5 Rxc3+ 44.Kd2 Rf3 45.Rxf3 exf3 46.gxf6 Kxf6
with a draw unless Crafty can be tempted to wander too far from a8 with his K.
This leaves 37.Rh3 met by 37...Ra6 38.Kb2 Bf8 [With the R still on h1, White could have Rb1 as a counter-attack: now Black recovers the Pawn in favourable circumstances] 39.c4!? bxc4!? (simpler is Bxa3+: I do not
agree or understand all Crafty's moves but in general they work) 40.Bb4 Bg7 41.Kc3 Rc6 42.Kd2 Ra6 43.Ke3 Ra7 44.Rh2 Rd7 45.Rc2 Rd4 46.a4 and at last the Pawns are moving forward, but this is far from won. My overall feeling is that the ending should be drawn. |
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| Jan-15-10 | | cyclon: 1. 30.BD5+ Kf8 31.Qxh7 Qxh7 ( -Qxd5? 32.Qxh8+, or even Bh6+ loses for Black) 32.Rxh7 Bg7 33.Bxc6 Rxc6 34.a3 White is simply pawn up with winning prospects. 2. 30.BD5+ Qxd5? 31.Qxh7+ Kf8 32.Bh6+ (Qxh8+ Qg8 should be analyzed, but I prefer the text) -Ke8 33.Qxh8+ Kd7/f7 ( -Ke7 34.Bg5+ mates) 34.Qg7+ Ke6 ( -Ke8 35.Bg5 mates either from e7, or h8) 35.Qxg6+ (NOW possible) -Kd7 ( -Ke7 36.Bg5+ opening h-line with a TEMPO) 36.Qg7+ ( -c8/-b8 selfblocked) -Ke6 ( -Kd6 37.KC1) 37.Bg5 Qd3+ 38.BF4 Qd3+ ( -Qxf3 39.Rh6+ Kd5 40.Qxe5+ Kc4 41.Qd4X, or -exf4 39.Rh6X) 39.Ka1 (Kc1 Rxc3+) , Black is in DEEP T-R-O-U-B-L-E. |
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| Jan-15-10 | | cyclon: One (at least) inaccuracy (tired at late); 37.Bg5 Qd3+ should be in BRACKETS ( ). |
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| Jan-15-10 | | patzer2: Based on <RandomVisitor>'s Rybka 3 analysis, it would seem 29...Raa6! takes away any winning chances for the sacrfice 27. Rxd5!? Still, if White can hold the draw or has reasonable chances of doing so OTB after 29...Raa6!, it may well be a risk worth taking -- as evidenced by White's win over a higher rated opponent in this game. Nevertheless 27...Rxd5!? is a fascinating true sacrifice, and 29...Raa6! is an instructive defensive move which truly tests its soundness. |
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| Jan-15-10 | | WhiteRook48: I thought it was 30 Qh6 |
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Jan-15-10
 | | Jimfromprovidence: <wals> <Analysis by Rybka 3 1-cpu: time 5 min depth 15 hash 3071mb> <2. (3.25): 30...Qxd5 31.Qxh7+[] Kf8 32.Qxh8+[] Kf7 33.Qh7+[] Kf8 34.Bg5[] Qd6 35.Qh8+> This is a side issue, but I'm surprised that this continuation picks up 34...Qd6 as the best way for black to go instead of 34...Qd3+ first, which at least forces the king to a1, setting up a back rank mate threat.
click for larger view |
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| Jan-15-10 | | zzzzzzzzzzzz: I don't get it. |
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| Jan-15-10 | | Quad Fifties: 27.Rxd5 and the Black advance is just wrecked in an instant |
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| Jan-15-10 | | RandomVisitor: Final look at 29...Raa6!
click for larger view Rybka 3:
<[-0.78] d=21 30.Bd5+> Re6 31.Bc5 Bf6 32.Qh6 Qf7 33.f4 exf4 34.Qxf4 Kg7 35.Qh2 Kh8 36.a3 Be5 37.Qh3 Kg8 38.Qd3 Nf6 39.Ba2 Qe8 40.g5 Nh5 41.Qe4 [-1.37] d=21 30.c4 Rd6 31.cxb5 Rd1+ 32.Rxd1 Qxd1+ 33.Bc1 Rd6 34.Qc2 Qxc2+ 35.Bxc2 Nf6 36.Bxa4 e4 37.fxe4 Nxe4 38.Bb3+ Kf8 |
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| Jan-17-10 | | VargPOD: Friday.
30.Bd5+ is screaming to be played. Let's look at continuations. 30...Kf8 31.Bxc6 Rxc6 32.Qxh7 Qxh7 33.Rxh7 Bf6 and white is up a pawn. Still a struggle though. 30...Qxd5 31.Qxh7+ Kf8 32.Qxh8+ and now
32...Ke7 33.Qg7+ Kd6 34.Qxg6+ Qe6 35.Qd3+ Kc7 36.Rh7+ is murder. 32...Kf7 33.Qh7+ Kf8 (Ke6 leads to previous lines, Ke8 34.Qg7) 34.Bg5 with the threat of Qh8+ Kf7 Rh7+ Ke6 Qf6# and if queen moves it's Qh8+ Kf7 Rh7+ Ke6 Re7+ and mate soon. So, it must be the 30...Kf8 line. I guess a pawn is enough. Oops, did not see 32...Qg8. 33.Qxe5 with threats looks strong though. Very complicated. Total 4/5 (7,5/12). |
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< Earlier Kibitzing · PAGE 3 OF 3 ·
Later Kibitzing> |
Kibitzing
sac: 27.Rxd5