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Ruslan Pogorelov vs Antonio Jose Andres Flores
Siviglia op 31st (2006), Seville ESP, rd 5, Jan-11
Zukertort Opening: Pirc Invitation (A04)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 1 OF 2 ·  Later Kibitzing>
Jan-15-16  Nick46: Wow. Shrewd.
Jan-15-16
Premium Chessgames Member
  Penguincw: Yay, Friday puzzle! I've been waiting for it to be Friday all week long!

Seriously, am I the only one who still feels like it's the Holidays (so very relaxed and lazy and all).

Anyway, I got my goal, which is to correctly predict the sacrifice, 31.Bxg6 hxg6 32.Qxg6.

Jan-15-16  dfcx: After 28.Bxg6 hxg6 29.Qxg6

A. 29...Qf8 30.Rb7 Rxb7 31.Rxb7 Bg7 32.Rf7 Qxf7 (Qg8 33.Rf5 similar) 33.Qxf7 and white wins end game with Q + 2P against R+B

B. 29...Rh7 30.Qxd6 Qf5 gets three pawn for bishop and probably wins the end game, but not as easily.


click for larger view

Black should have chosen the second line for a better chance.

Jan-15-16  EIDorado: @dfcx I believe after 28.Bxg6 hxg6 29.Qxg6 Rh7 30.Qxd6 Qf5, follows 31.Rb8+ and black is in a bad shape.
Jan-15-16
Premium Chessgames Member
  agb2002: The material is identical.

The rook on f7 and the black bishop are defenseless. This invites to play 28.Bxg6:

A) 28... hxg6 29.Qxg6 Qf8 30.Rb7

A.1) 30... Rxb7 31.Rxb7 Bg7 (31... Qg8 32.Qxh6+ Qh7 33.Qxh7#) 32.Rf7 (32.h5 Qf6) 32... Qg8 33.Rf5 (33.h5 Rf8)

A.1.a) 33... Qe8 34.Rh5+ Kg8 35.Qh7+ Kf8 (35... Kf7 36.Rf5+ as in the line) 36.Rf5+ Ke7 (36... Bf6+ 37.Rxf6+ Qf7 38.Qxf7#) 37.Qxg7+ Kd8 38.Rf8 wins.

A.1.b) 33... Qb8 34.Rh5+ Kg8 35.Qh7+ Kf8 36.Rf5+ Ke8 37.Qxg7 Qb2+ 38.Kh3 and mate in two.

A.2) 30... Re7 31.Rxe7 Qxe7 32.Qxh6+ wins two pawns at least.

A.3) 30... Rxf3 31.Qh7#.

A.4) 30... Rg7 31.Qxh6+ Kg8 32.Rxg7+ Qxg7 33.Qxd6 wins three pawns at least.

B) 28... Rg7 29.Bf5 Qg8 30.g4 with an extra pawn and a much better position.

Jan-15-16
Premium Chessgames Member
  Jimfromprovidence: <ElDorado> <@dfcx I believe after 28.Bxg6 hxg6 29.Qxg6 Rh7 30.Qxd6 Qf5, follows 31.Rb8+ and black is in a bad shape.>

Looks bleak for sure, say if black tries 31...Bf8 and white follows with 32 Rxa8, for example.


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Black looks to be mated for sure but has a perpetual check after 32...Qc2+.

Jan-15-16  erbalaji: A bit easy for a Friday!
Jan-15-16
Premium Chessgames Member
  An Englishman: Good Evening: Still believe the game continuation was best, but suspect that 29...Rh7 would have put up a somewhat better fight.
Jan-15-16  diagonalley: well, the bishop sac was really the only candidate move and the payback of opening up the enemy king plus the capture of (at minimum) two pawns looks to be a favourable deal... even more so with doubled rooks ready to penetrate.. agree with <erbalaji> ... easy for a friday
Jan-15-16  gofer: We have "Plan A" and "Plan B".

Plan B is simple, stack two rooks and a queen on the B file and in that way gain control of either B7 or B8.

The reason for Plan B is that Plan A is unlikely to come to fruition, so we are probably going to have to rely on Plan B, but what the hell...

<28 Bxg6 ...>

Black cannot accept!!!

28 ... hxg6
29 Qxg6 ...

(29 ... Rh7 30 Qxd6 threatening Rb8 and at least winning 3 pawns for the bishop!)

29 ... Qf8
30 Rb7 Rxb7
31 Rxb7 Bg7
32 Rf7! Qg8
33 Rf5! Qe8
34 Rh5+ Kg8
35 Qh7+ Kf7/Kf8
36 Rf5+

So black must refuse. Rf6/Rf8 loses another pawn or worse!

<28 ... Rg7>

Okay, back to "Plan B"...

<29 Bf5 Qc7!>

Swapping off rooks for the black queen (30 Rb7 Qxb7 31 Rxb7 Rxb7) doesn't seem that great for white...

<30 Rb5 Rf8>
<31 Be6 ...>

This is the nail in black's coffin. The rooks can never double up to start an attack on the f or g files. Also this creates huge weaknesses on g7 for the white rook or queen to infiltrate...

Black has nothing to do, but wait for R1c3 and then Qc1 which will signal the end for black. I imagine that black resigned somewhere around here...


click for larger view

~~~

So I got the first 7 moves, but I am interested in comments from <Jimfromprovidence> about...

<28 Bxg6 hxg6>
<29 Qxg6 Rh7>
<30 Qxd6 Qf5>
<31 Rb8+ Bf8>


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I wonder what the silicon monsters say to this pawn grab...

<32 Qxc5! ...>

White wins a fourth pawn for the bishop and also provides protection for its king.


click for larger view

Jan-15-16  patzer2: I missed today's Friday solution, as I stopped calculating after visualizing 28. Bxg6 hxg6 29. Qxg6 Qf8. If I had looked a move further and considered the possibility 30. Rb7! (+6.39 @ 21 depth, Deep Fritz 14), I might have solved it.

Looking at another possible defense for Black, I figured 28. Bxg6 Rh7 30. Qxd6 to was better for White.

However, I didn't see the tricky computer defense 28. Bxg6 Rh7 30. Qxd6 Qf5! 31. Rb8+ Bf8! (diagram below)


click for larger view

when White must find 32. Qe6! (not 32. Rxa8? Qc2+! 33. Kh3 Qf5+ 34. Kh2 Qc2+ 35. Kg1 Qxb1+ 36. Kh2 Qc2+ 37. Kh3 Qf5+ =) when Deep Fritz 15 indicates play might continue 32... Qxe6 33. dxe6 Rxb8 34. Rxb8 Kg7 35. Ra8 a5 36. a4 Bd6 37. Ra7+ Kg6 38. h5+ Kh6 39. Ra6 Be7 40. g4 Kg5 41. Rxa5 e4 42. Ra7 Kf6 43. fxe4 Rg7 44. Kh3 Kxe6 45. a5 Rg8 46. a6 Bg5 47. Rb7 Ke5 48. a7 Ra8 49. Rg7 Bh6 50. Re7+ Kf6 51. Rc7 Bd2 52. Kg3 Bb4 53. e5+ Kxe5 54. g5 Kf5 55. g6 Bc3 56. Rf7+ Kg5 57. g7 Kh6 58. Rf8 Rxf8 59. gxf8=Q+ with mate-in-five to follow.

Failing to see the winning possibilities after 28. Bxg6 hxg6 29. Qxg6 , my attempted solution was the weaker 28. Qc2, which fizzles out to near equality and a likely draw after 28...Qd7 29. R1b2 Raf8 30. Qb1 Qa4 31. h5 gxh5 32. Rb7 Qxc4 33. Rxf7 Rxf7 34. Rb8+ Kg7 35. Bxh7 e4 36. Bxe4 Qc1 37. Qxc1 Bxc1 38. Rd8 h4 39. Rxd6 hxg3 40. Rg6+ Kh8 41. Kxg3 Rg7 42. Kg4 Rxg6+ 43. Bxg6 (+0.42 @ 30 depth, Deep Fritz 15).

Jan-15-16  patzer2: For a possible improvement in this Dutch defense, instead of 8...Na6, I prefer 8...Nxd5 as in E Vladimirov vs M Mahjoob, 2000.
Jan-15-16  morfishine: <28.Bxg6>
Jan-15-16  wooden nickel: Maybe this is the case <My first intention wasn't to win the game, I just wanted to sacrifice a piece. -Steinitz>
Jan-15-16  Kasparov Fan: Not so difficult when you hear what the position is saying, If you are going to break black's defense you will have to sack the bishop at g6 as any other plan is too slow and gives black time to regroup.
Jan-15-16  Cybe: 29… Rh7 is OK – strong russian engines are giving about +0.80 for white.
Jan-15-16  stacase: The Bishop sacrifice was obvious, but 30. Rook b7 was not.
Jan-15-16  mel gibson: I saw this one in only a few seconds.
There was no other move for white
- only a Bishop sacrifice.
Jan-15-16  jith1207: Not sure if this is easy for Friday. Sure, it is easier to find the bishop sacrifice. But if the subsequent tricky moves are not found, situation might get upside down easily or at least could lead to perpetual as <JimFrom Providence > points out. The ending was tricky for me, I failed but that was a good lesson for such a position with the king hanging behind the bishop supported by his queen versus the opponent queen and a rook.
Jan-15-16  EIDorado: @ Jimfromprovidence I missed the perpetual check. 29. ... Rh7 is indeed the strongest move.
Jan-15-16  YetAnotherAmateur: The sequence 28. Bg6 hxg6 29. Qxg6 jumped out immediately, because it threatens Qxh6+, Qxf7, and Qxd6 (with a followup threat of Rb8-Rxb8-Rb8 winning the black queen).

Of course, black doesn't have to be so obliging as to let white carry one of those threats out, and can play Qf8 to defend all 3 of the attacked points. However, in doing so, she abandons the defense of b7, which is now left to the rook. White can now claim control of the 7th rank and threaten mate, and black is powerless to stop it in the end.

I can only claim partial credit for this one though: I saw the bishop sac and the trouble it created, but only got as far as seeing that white gets the material back and has a strong positional advantage after doing so.

Jan-15-16  dumbgai: The idea here is easy to see, but the specific tactics are not easy to calculate.
Jan-15-16
Premium Chessgames Member
  kevin86: White gives up a bishop for two pawns...then cripples his opponent with a lethal attack.
Jan-15-16  beenthere240: While the bishop sac is easy to spot since it is a puzzle, I found the Rook moves difficult to see. I sort of saw Rb7, but Rf7 and Rf5 escaped me.
Jan-15-16  RandomVisitor: The game line of 28.Bxg6 hxg6 29.Qxg6 is perhaps not best due to 29...Rh7.

Maybe 28.Rb5 Qg8 or 28.h5 gxh5 29.Rh1 or 28.R3b2 Qc7 are worth a look.

27.h5! Nf5 28.hxg6 is the way to do it.

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