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Surya Shekhar Ganguly vs Lu Shanglei
2nd CHN-IND Summit (2017), Liaocheng CHN, rd 3, Mar-07
Zukertort Opening: Sicilian Invitation (A04)  ·  0-1

ANALYSIS [x]

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sac: 40...e3 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Mar-20-20  benjaminpugh: I totally saw the entire continuation, all the way up to the poison knight at move 48 where, if the white king captures, he loses the queen. Yea, totally saw all that.
Mar-20-20
Premium Chessgames Member
  Cheapo by the Dozen: What <benjaminpugh> said.
Mar-20-20
Premium Chessgames Member
  drollere: i went with

41. .. e2
42. Rg1 Rd1
43. Nf3+ Rxg1+
44. Kxg1 Qc5+
45. Kh1 Qxc6

Mar-20-20  Walter Glattke: Material was equal after 41.-bxc6. 41.-e2 42.Rg1 Rd1 possible was 43.Qh7+ Qxh7 44.Nxh7+ Rxg1+ 45.Kxg1 e1Q+ winning. So 43.Nf3+ Rxg1+ 44.Kxg1 Nh3+ 45.Kh1 Qg4 46.Qg5+ Qxg5 47.Nxg5 e1Q+ 48.Kg2 Nxg5 wins. Or 44.-Qb1+ 45.Kf2 Qf1+ 46.Ke3 e1Q+ as in the match. After 41.-bxc6 42.Re1 e2 43.Nf3 Rd1 44.Kg1 Qg4+ black also wins. In the match could follow 49.Kxf4 Qd2+ and QxQ
Mar-20-20  stacase: One of those little hints that come up when you post says, "Passed Pawns must be pushed" so, 41...e2 and 42.Rg1 was pretty much a no brainer - but I failed to notice that 43...Rxg1+ said check. Over the board I assume Ganguly would have said, "Check!" Other than that, I got the first two moves.
Mar-20-20  actinia: 44. ... Nh3+ is mate in 3
Mar-20-20  newzild: <actinia> It would appear so.
Mar-20-20  stacase: Hmmm from my post above:

<...I failed to notice that 43...Rxg1+ said check.>

It was supposed to say, "I failed to notice that 43.Nf3+ said check."

Mar-20-20  Autoreparaturwerkbau: If games continues (suboptimally) 49.♔g3 ♘h5+ 50.♔h3 we get here


click for larger view

It is mate in 2 for black! Can you find it without help? :)

Mar-20-20  karik: <Autofix> Nice.
Mar-20-20  malt: 43...Qg4 looks an interesting move.
Mar-20-20
Premium Chessgames Member
  TheaN: The game line is obvious and I somewhat stopped after 44....Qb1+, which is surprisingly suboptimal (44....Nh3+ 45.Kg2 Qg4+ 46.Kh1 Nf2#, not sure why this was missed OTB and in a lot of analysis) and still quite tough to solve. Have to be harsh for myself, no points, sadly.
Mar-20-20
Premium Chessgames Member
  PawnSac: < TheaN: 44....Qb1+ suboptimal (44....Nh3+ 45.Kg2 Qg4+ 46.Kh1 Nf2#) >

yes, with the alternatives..
Nh3+ 45. Kh1 e1=Q+ 46. Nxe1 Qf1# or 46. Kg2 Qg4#

Mar-20-20
Premium Chessgames Member
  agb2002: Black is a bishop down.

White threatens Be4.

The natural move 41... e2 threatens mate next and controls the entry point d1:

A) 42.Ra(c)1 Rd1+ 43.Rxd1 exd1=Q(R)#.

B) 42.Re1 Rd1 43.Nf3 Qg4 44.Qg5+ Qxg5 45.hxg5 bxc6 46.Kg1 Nd3 wins decisive material.

C) 42.Rg1 Rd1

C.1) 43.Be4 Rxg1+ 44.Kxg1 e1=Q#.

C.2) 43.Nf3+ Rxg1+ 44.Kxg1 (44.Nxg1 e1=Q wins) 44... Qg4+ 45.Kf2 (45.Kh1 Qg2#) 45... Qg2+ 46.Ke3 (46.Ke1 Nd3+ 47.Kd2 e1=Q+ wins) 46... e1=Q+ 47.Nxe1 Qe2+ 48.Kd4 (48.Kxf4 Qd2+ wins the queen) 48... Qd2+ 49.Ke4 (else a check with the knight wins the queen) 49... Qxe1+

C.2.a) 50.Kd4 Qd2+ 51.Ke4 f5+ 52.Kf3 Qe2+ 53.Kg3 Qe3+ 54.Bf3 Ne2+ wins the queen.

C.2.b) 50.Kf3 Qe2+ 51.Kg3 Qe3+ 52.Kg4 (52.Bf3 Ne2+ wins the queen) 52... f5+ 53.Kg5 Nd3+ 54.Kg6(h5) Qxh6+ 55.Kxh6 Bxc6 wins.

C.3) 43.Nxe6+ Rxg1+ 44.Kxg1 e1=Q#.

Mar-20-20
Premium Chessgames Member
  agb2002: <TheaN: The game line is obvious and I somewhat stopped after 44....Qb1+, which is surprisingly suboptimal>

My 44... Qg5+ is even more suboptimal, but still wins.

Mar-20-20
Premium Chessgames Member
  chrisowen: Bang on own it?
Mar-20-20  King.Arthur.Brazil: I saw the same as <TheaN>, and was surprised for the game went on different direction. The time pressure was just ended at 40...e3, therefore, {44...Qb1+?) could be an automatic played move. The sequence 44...♕g4+ 45. ♔f2 ♕g2+ 46. ♔e1? ♕f1+ 47. ♔d2 ♕d1+ 48. ♔e3 e1=♕+ seem to reach the same position too.
However, I prefered 46...♘d3+ 47.♔d2 e1=♕+ winning. If 46. ♔e3 e1=♕+ 47. ♘xe1 ♕e2+ (48.♔xf4 ♕d2+ win the ♕}), 48.♔d4 e5+ 49.♔c5 ♕e3+ (50.♔b4? ♘d3+ win the ♕} too, or 50.♔d6 ♕d2+ again 51.♔c5 ♕d3+, or 51.♔c7 or 51.♔e7, the same 51...♘d5+ win the ♕. While 50.♔b5 ♕b6#. My moves are also correct. Doesn't hurt lose such points...
Mar-20-20  goodevans: It so happens that this position also works nicely as a puzzle with <white to move> which, incidentally, is how I read it.

Doh!

Mar-20-20  goodevans: <Autoreparaturwerkbau>

An interesting little puzzle, thanks.

<** SPOILER ALERT **>

Knowing it's mate in 2 means we can't let white get in a spite check, which in turn means black's first move must itself be a check.

There are only two decent candidates as others are thwarted by a capture. Since <50...Qd3+ 51.Kb2> leads nowhere it must be the only other check where white can't capture.

Mar-20-20  raju17: Beauty of the position of the Knight which remained under threat continuously, did not move, supported the attack and forced win.
Mar-20-20  RandomVisitor: After 37...Nxg6 white is winning if he plays 38.Rf1!


click for larger view

Stockfish_20031417_x64_modern:

<41/80 03:20 +3.96 38.Rf1 Qd4 39.Nxf7> Nf4 40.Qg4+ Kxf7 41.Qxf4+ Ke7 42.b4 Be8 43.b5 e3 44.Qg5+ Kd7 45.Bf3 Kc8 46.Re1 Qxc4 47.Qxe3 Rd3 48.Rc1 Rxe3 49.Rxc4+ Kd8 50.Kg2 Rd3 51.h5 Rd7 52.Kg3 Rh7 53.Kh4 Rh8 54.h3 Kd7 55.Bg4 Rh7 56.Re4 Bf7 57.Kg5 Ke7 58.h6 Rh8 59.Rc4 Rg8+ 60.Kh4 Kf6 61.Rf4+ Ke7 62.Bh5 Bxh5 63.Kxh5 Rh8 64.Rg4 a6 65.Rg7+ Kf6 66.Rxb7 axb5 67.a5 Rg8 68.Rxb5

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