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Abhijeet Gupta vs Rameshbabu Praggnanandhaa
Isle of Man Masters (2016), Douglas IMN, rd 7, Oct-07
English Opening: Anglo-Indian Defense. King's Indian Formation (A15)  ·  1-0
ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Mar-16-17
Premium Chessgames Member
  YouRang: Thursday 55.?


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There are promotion tactical considerations on both sides, but white has a very well-placed bishop that pins black's Pc3 and x-rays to the promotion square for Pe2. Meanwhile, white has Pb7 which is ready to promote, and it guards the Ra8.

There's hardly anything else to even consider except <55.Rc8>


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White attacks the pinned Pc3, so that ...e1Q can be met with the Bxc3+ skewer. Of course, 55...Rxc8 56.bxc8Q keeps the skewer threat alive.

The black pawn may promote first, but it's doomed to a short life.

Easy Thursday.

Mar-16-17  Walter Glattke: Only perpetual with 55.Rxh8 e1Q 56.Bc3+ Kxc3 57.Rxh3+ Kd2 58.b8Q Qf2+ or same position with 55.Bxc3+ Kxc3 56.Rxh8 etc.
Mar-16-17  AlicesKnight: 55.Rc8 seems to be the key -the threat is Bxc3+ skewering a new-born Q while a K-move allows the c3 capture and safe queening by White. Let's see - yes! A curious battle of passers and opposite Bs.
Mar-16-17  Cheapo by the Dozen: Oh great. Not only did I do this sub-optimally, but my post about it got lost.

Anyhow, I went with Bxc3+. That seems to work too. If Black declines, his queening square is covered. If he takes, then we could have

55 Bxc3+ Kxc3
56 Rc8+ Kd2
57 b8(Q) e1(Q)
58 Qd6+ Ke2
59 Qe5+ and Black is being slaughtered.

Another try for Black is

55 Bxc3+ Kxc3
56 Rc8+ Rxc8
57 bxc8(Q)+ Kd2
58 Qe8 e1(Q)
59 Qxe1+ Kxe1
60 Kxh3 Kf2
61 Kh4 Kf3
62 Kg5 and White has won the race

Mar-16-17
Premium Chessgames Member
  gofer: Well I went around this one the long way. First thinking it was black to play. After that looking at Rxh8, Bxc3+ and then the combination of both Bxc3+ and Rxh8 looking for a draw by perpetual check, between Rd8+ and Rc8+. Finally and really only after thinking that things were all rather difficult for white did I see the obvious <55 Rc8>.

Easier than the last couple of days...

Mar-16-17  saturn2: Finally I saw 55 Rc8 and black has no good answer.

If 55..d1 56 Bxc3 forking K and Q.

and if 55..RxRc8 bxR queening and again d1Q looses the queen.

Mar-16-17
Premium Chessgames Member
  thegoodanarchist: My tribute to Sammy Hagar:

I... can't... solve... 55?

Mar-16-17
Premium Chessgames Member
  morfishine: <55.Rc8> secures the victory due to the pin

For some odd reason, at least for me, Thursday mediums are, over time, easier than Wednesday mediums

*****

Mar-16-17
Premium Chessgames Member
  whiteshark: I wish it was all that <#easy>.
Mar-16-17  Abdel Irada: ∞

<morfishine: <55.Rc8> secures the victory due to the pin

For some odd reason, at least for me, Thursday mediums are, over time, easier than Wednesday mediums>

True, but the Thursday mediums seem to have more ectoplasm problems.

Mar-16-17
Premium Chessgames Member
  benveniste: I first tried ♗xc3, but it leads to a draw.
55. ♗xc3 ♔xc3
56. ♖c8+ ♔d3
57. b8/Q ♖xc8

White can either take the rook, which leads to a drawn K+P/K game, or decline and draw by perpetual check.

Mar-16-17
Premium Chessgames Member
  ChessHigherCat: I saw the solution in much less time than it took me to memorize the spelling of black's name!
Mar-16-17
Premium Chessgames Member
  OhioChessFan: <Cheapo> here's why 55. Bxc3+ doesn't work. You had:

55 Bxc3+ Kxc3
56 Rc8+ Kd2
57 b8=Q e1=Q
58 Qd6+ Ke2
59 Qe5+ and Black is being slaughtered.

That doesn't work as <57...Rxc8> ends White's fun. The whole line appears to be

55. Bxc3+ Kxc3
56. Rc8+ Kd2
57. b8=Q Rxc8
58. Qxc8 e1=Q
59. Qxf5
and now the checks start and I am pretty sure this is a perpetual. *


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Before posting, I went ahead and put that in a Nalimov Table and it says a win for White in 78!

Mar-16-17  eblunt: I had ♗xc3 as well, I was convinced I could make it work; White has the tempo with ♖ and ♕ working together either to a mating pattern, or where the black queen gets skewered.
Mar-16-17  eblunt: <Ohio chess fan> Yes good point , but 57 .... Qd6+ and the White queen shimmies down the board with check each time and gets to the pawn before it can queen ?
Mar-16-17
Premium Chessgames Member
  transpose: <Cheapo><Ohio chess fan><eblunt> I also went with Bxc3 convinced I could make it work in time, but I did not contemplate 57 ...Rxc8. I do not know if <eblunt> 58 Qd6+ works--maybe it does, maybe not, but it obviously would be simple with the stronger initial move as in the game. What is that old saying? "When you see a good move, stop and think because there might be something better"?
Mar-16-17  JASAHA: I gather that Bxc3 also works, just takes an hr longer. :)
Mar-16-17
Premium Chessgames Member
  OhioChessFan: <58. Qd6+> doesn't work. 58...Kc1 and the only check is 59. Qa3+ Kd2 guarding the Pawn, and now the Rook can interpose on any different check than d6 and a3.
Mar-16-17  Ariogermano: You Rang , i love Your comments!
Mar-16-17  stst: Purely visual, W tries to delay Black's promotion while speed up his own. Two schemas: (A)
53.Rc8 if RxR, 54.cxR=Q next Bxc3+ will take the promoted Black pawn. If not (RxR) but promote, then also Bxc3+ K has to yield, then Bx(e1=Q) Still Black RxR will produce cxR=Q for White.

(B) - positional not so ingenious, but up a tempo first: Try Bxc3+ to distract the K's protection:
53.Bxc3+ KxB (if sac denied, W may end up with R+B+Q v Black's Q) 54.RxR e1=Q
55.b8=Q Qf2+
58.Kxh3 Qf3+ ... etc

W's Q is guarding the other P, and its K is not cornered yet by Black's Q, so should prevail.

Mar-16-17  BOSTER: This is the pos black to play 45...


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Let's try 45...Rg6
If 46.a7 Rg2+ 47.Kxh3 Rxe2 48.a8=Q Bxa8 49.Rxa8 Rb2 And maybe black has more possibility to draw.

Mar-16-17  RandomVisitor: After 49.Ra1

black is still in the game if he tries 49...Rh7


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Komodo-10.1-64bit:

<0.00 49...Rh7 50.b6 Rb7> 51.Kxh3 Rxb6 52.Kg3 Rh6 53.Kf2 Kd3 54.c4 Rh2+ 55.Kg3 Rh6 56.Ra3+ Ke4 57.Bc3 Rh1 58.Kf2 Rh2+ 59.Kg3 Rh1

Mar-16-17  RandomVisitor: White meanwhile missed the win with 44.a7


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Komodo-10.1-64bit:

<+5.69/31 44.a7 Ra6 45.bxc5> Ra2 46.a8Q Rxa8 47.c6 Bxe2 48.c7 Rc8 49.Rb8 Rxc7 50.Bxc7 Bh5 51.Kxh3 e2 52.Rb1 Kd3 53.Kg3 Ke3 54.Bb6+ Kd3 55.Kf2 Bf7 56.Re1 Ke4 57.Bc7 Kd5 58.Be5 Bh5 59.Rxe2 Kc4 60.Bd4 Bg6 61.Re1 Kd3 62.Re3+ Kc4 63.Re5 Bh7 64.Kg3 Bg6 65.Bb6 Kb3

Mar-16-17
Premium Chessgames Member
  Fusilli: <YouRang> <... Easy Thursday>

I have to agree. If black had even a remotely resisting move against Rc8, then it would escalate in difficulty, but that's not the case today.

Mar-16-17  RandomVisitor: 31...h3 passed pawns must be pushed


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Komodo-10.1-64bit:

<0.00/46 31...h3 32.f5 h2> 33.Rac1 Ra2 34.Ke3 Ra6 35.f6 Ra8 36.a6+ Kxa6 37.Be5 Rh8 38.Ra1 Rxa1 39.Rxa1+ Kb5 40.Rh1 Kc4 41.Rxh2 Rxh2 42.Bxh2 Kxc3 43.Bxc7 Kxb4 44.Be5 Kc4 45.Bg3 Kd5 46.Be1 Ke5 47.Bc3+ Ke6 48.Kxe4 Bxe2

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