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Abhijeet Gupta vs Babu M R Lalith
4th Al Ain Chess Classic (2015), Al-Ain UAE, rd 7, Dec-28
Nimzo-Indian Defense: Simagin Variation (E46)  ·  1-0



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Premium Chessgames Member
  morfishine: Funny series of moves with the rook going back and forth between <f4> & <f5> before White finally figures it out



May-06-17  Walter Glattke: 35.Qh5 Kg7 36.e5 Nd5 (37.Qxd8 Nxf4)
May-06-17  Iwer Sonsch: <gofer> 34.Qh5+ draws with perpetual, so the line is not garbage.

After 34.Rc1, though, Black has 34...Nd7, which is being rated 0.00 @depth 27.

May-06-17  Walter Glattke: Corr: Lost in space follow Analysis:
34.Qh5 Kg7 35.e5 Nd5 36.Rd4 perhaps Qb6!? 36.-Rg8 37.Qe4 Ne7 more solid
May-06-17  Iwer Sonsch: <lost in space> After 32.Qh6 Rg8 33.Re1 Qe5 34.Rf5,

34...Qd4+!! is impossible.

May-06-17  Walter Glattke: C: 34.Qh4!
May-06-17  Walter Glattke: Iwer, I told this impossible move before, but I always made typing mistakes here, I prefer 32.Rf8! as you and stockfish, my actual answer to 32.Qh6 Rg8 is 33.Re1 Rg6 34.Qh4 (34.Qxh7+ Rg7 and Rh7) 34.-Kg7 35.e5 Nd5 36.Rxd4
May-06-17  Walter Glattke: 34.Qxh7+ Rg7 35.Qh4 d3 36.e5 d2 37.Rxf6+ Kg8 38.Rxe6 dxe1Q+ 39.Qxe1 wins
May-06-17  Walter Glattke: I think, Rg8 is "banana-care" everything goes wrong without Rf8.
May-06-17  RandomVisitor:

click for larger view

Komodo-10.1-64bit: <8 hours computer time>

<+0.65/43 32.Qh6 Rf8> 33.Re1 Ke7 34.e5 Nd5 35.Qxh7+ Ke8 36.Rxd4 Rd7 37.Qh5+ Kd8 38.Red1 Kc7 39.Qg4 Qxg4 40.fxg4 Nb6 41.e6 Rxd4 42.Rxd4 Rd8 43.e7 Rh8 44.h4 Nc8 45.h5 Nxe7 46.Kh2 Kb6 47.Rd7 Nf5 48.gxf5 Rxh5+ 49.Kg3 Rxf5 50.a4 Rf8 51.Rd4 Kc5 52.Rf4 Rd8 53.Kh4 Rh8+ 54.Kg4 Kd5 55.Rf5+ Kd6 56.Rf7 b6 57.Rf4 Kd5 58.Rf5+ Kc4 59.Kf3 Kb3 60.Rf4 Rc8 61.g4 Rc3+

0.00/43 32.Rd1 Rg8 33.Qh5+ Kg7 34.Qg5+ Kf7

May-06-17  RandomVisitor: After 28.f3 black could have tried 28...Nc3

click for larger view

Komodo-10.1-64bit: <42 minutes computer time>

<-1.81/37 28...Nc3> 29.Re1 Nxb5 30.Rd3 Kh8 31.h3 Nc7 32.Rb1 Qc6 33.Kh1 Rd7 34.Rbd1 Rg7 35.Qh4 Qg6 36.R1d2 b6 37.Qf2 b5 38.Kh2 Qd6+ 39.Kh1 Qa6 40.Qe1 Qg6 41.Qf2 Ra8 42.g4 Re8 43.Rd1 Qf6 44.f4 Re4 45.Kh2 Rc4 46.Qd2 h6 47.Kh1 b4

Premium Chessgames Member
  patzer2: Here's my look at today's Saturday puzzle (32. ?) and game with Stockfish 8:

<1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Ne2 d5 6.a3 Bd6 7.Ng3 c5 8.dxc5 Bxc5 9.b4 Be7 10.cxd5 exd5 11.Bd3 a5 12.b5 Re8 13.O-O Nbd7 14.Bb2 Nc5 15.Nce2 Be6 16.Nf4 Bf8 17.Bc2 Rc8 18.Rc1 g6 19.Ngh5!? or ?!> In a quiet situation where White has a small but clear positional advantage against the isolated pawn with something like the Stockfish suggestion 19. Nge2 b6 20. Bd4 (+0.63 @ 31 depth, Stockfish 7), White decides to take a risk and go for broke with a speculative piece sacrifice.

<19...Nxh5 20.Nxh5 gxh5 21.Qxh5 f5?!> Up to this point, Black was doing fine in refuting the Knight sacrifice, but this is not Black's best move here.

Much stronger and likely winning is 21...h6! (-2.33 @ 29 depth, Stockfish 8) when play might continue 22.Qe5 f6 23.Qf4 Qc7! 24.Qxf6 Qg7 25.Qd4 Qxd4 26.Bxd4 Ne4 27.a4 Ba3 28.Ra1 Bb4 29.Bd1 Bc3 30.Bxc3 Rxc3 31.Bf3 Kg7 32.h3 Nd2 33.Bh5 Nxf1 34.Bxe8 Nd2 35.Bh5 Nb3 36.Rd1 Nc5 37.Rd4 Kf6 38.Bf3 Ke5 39.Be2 Rc1+ 40.Rd1 Rc2 (-4.30 @ 25 depth, Stockfish 8)

<22.Bxf5 Bxf5 23.Qxf5 Qd7 24.Qh5 Bg7 25.Bxg7 Kxg7 26.Rcd1 Rcd8 27.Rd4 Ne4 28.f3 Nf6?>

Strongest and probably winning here is 28...Nc3! when play might continue 29.Rd3 d4 30.Qg5+ Kh8 31.exd4 Nd5 32.a4 Re7 33.Kh1 Rg8 34.Qh6 Re6 35.Qc1 Re2 36.Rg1 Qe6 37.Rdd1 Rg6 38.Qa3 b6 39.Rc1 Qg8 40.h3 Rgxg2 41.Qd6 Rg6 42.Rxg6 hxg6 43.Qg3 Qf7 44.Rf1 Kg7 45.Rg1 Nf4 46.h4 Qf6 47.Re1 Rg2 48.Re7+ Qxe7 49.Qxf4 Rf2 50.Qe4 Qc7 51.Qe5+ Qxe5 52.dxe5 Kf7 (M14, Stockfish 8 @ 41 depth)

<29.Qg5+ Kf7 30.Rf4 Qe6?> This slight mistake allows White to fully equalize after 31. e4! =.

Maintaining a slight Black advantage with good winning chances is 30...Qd6 (Stockfish 8 -0.49 @ 33 depth), when play might continue 31.Qh6 Re6 32.Qxh7+ Ke8 33.Qd3 Rc8 34.Re1 Ke7 35.Rd4 Qc5 36.a4 Qc3 37.Qxc3 Rxc3 38.Kf2 Nd7 39.Rxd5 Nc5 40.Red1 b6 41.e4 Nxa4 42.g4 Nc5 43.h4 a4 44.g5 a3 45.Rd8 Rg6 46.Ra8 Nd3+ 47.Kg3 Ne5 48.Ra1 Rxf3+ 49.Kg2 Rf4 50.R1xa3 Rxh4 51.R3a7+ Nd7 52.Kg3 Rxe4 53.Kf3 Ree6 54. Kf4 (-3.04 @ 30 depth, Stockfish 8)

<31.e4 d4 32.Qh6!> This solves the Saturday May 6, 2017 puzzle.


Putting up the most resistance is 32...Rf8 33.Re1 Ke7 34.e5 Nd5 (+0.85 @ 30 depth, Stockfish 8) when play might continue 34...Nd5 35.Qxh7+ Ke8 36.Rxd4 Rf4 37.Ree4 Rxe4 38.fxe4 Ne7 39.Qh8+ Qg8 40.Rxd8+ Kxd8 41.Qxg8+ Nxg8 42.Kf2 Ne7 43.Ke3 Ng6 44.Kd4 Kd7 45.Kd5 Nf4+ 46.Kc5 Kc7 47.g3 Ne2 48.e6 Nc3 49.e5 b6+ 50.Kc4 Nb1 51.a4 Kd8 52.Kd5 Nc3+ 53.Kc6 Nxa4 54.h4 Ke7 55.h5 Kxe6 56.h6 Kxe5 57.h7 (M18 @ 41 depth, Stockfish 8)

If 32...Rg8, White wins after 33.Re1 when play might continue 33...Rd5 34.Qxf6+ Qxf6 35.Rxf6+ Kxf6 36.exd5 Rg5 37.Re6+ Kf7 38.Kf2 d3 39.Ke1 Rxg2 40.Rh6 Kg7 41.Rb6 Re2+ 42.Kd1 Re7 43.a4 Rd7 44.Kd2 Kf7 45.h4 Ke8 46.Re6+ Kd8 47.d6 Rf7 48.Re7 Rxf3 49.Rxb7 Rf6 50.Rxh7 Rxd6 51.h5 Ke8 52.Rg7 Rb6 53.Rg6 Rb7 54.h6 Kf8 55.b6 Re7 56.Rc6 Re2+ 57.Kxd3 Rb2 58.Rc8+ Kf7 59.h7 Rb3+ 60.Ke4 Rh3 61.h8=Q Rxh8 62.Rxh8 Kg7 63.Kf5 Kxh8 64.Kf6 Kh7 65.b7 Kh6 66.b8=Q Kh5 67.Qg3 Kh6 68.Qg6#.

<33.Qh4 Qe5 34.Rf5 Qe6 35.Rf4 Qe5 36.Rf5 Qe6 37.f4 d3 38.Re5 d2 39.Rd1 h5 40.Rxe6+ Kxe6 41.Qh3+ Kf7 42.e5 1-0> Black resigns in the face of White's overwhelming material advantage (+8.41 @ 27 depth, Stockfish 8). If the Knight moves, White will win even more material (e.g. 42...Ng8 43. Qxh5+ ).

A trap White needs to watch for is 42...Rd5!? as 43. exf6?? loses to 43...Re1+ . Instead, after 42...Rd5!?, White wins with 43. Qf5! Re6 44. a4 Red6 45. Kf1 Re6 46. Kf2 Rb6 47. Ke3 (+9.58 @ 32 depth, Stockfish 8)

Premium Chessgames Member
  patzer2: <Random Visitor> Thanks for the deep analysis of the improvements 28...Nc3 to and 32...Rg8 to .

I'll run your Komodo 10.1 analysis through Stockfish 8 on a long run later today or tomorrow to see if I can find anything new or worthy of note in these variations.

May-06-17  RandomVisitor: After 21...h6! white's attack is completely defused.

click for larger view

Komodo-10.1-64bit: <6 minutes computer time>

<-1.96/33 22.Qe5 f6 23.Qh5 Bg7> 24.Rfd1 Qe7 25.Qg6 Ne4 26.Bxe4 dxe4 27.Qxe4 Rxc1 28.Rxc1 f5 29.Qb1 Rd8 30.Qc2 Kh7 31.b6 Rc8 32.Qb1 Rxc1+ 33.Qxc1 Bxb2 34.Qxb2 Qc5 35.h3 Kg6 36.Qh8 Qd6 37.Qc3 Qxb6 38.Qe5 a4 39.Kh2 Qc6 40.Qg3+ Kh7 41.Qe5 Qd5 42.Qf6 Qd7

May-06-17  IloiloChess: I don't see how a move that gives a one pawn advantage with best play qualifies as a puzzle. Maybe as a 'game of the day' but not as a puzzle.
May-06-17  Walter Glattke: My meaning, one may see the third comment of this day.
Premium Chessgames Member
  agb2002: White has two pawns for a knight.

Black wants to push the d-pawn.

I have considered Rc1, Rf5 (to support e5), Qh5+ and Qh6 and I think I'd play 32.Rc1 based on 32... d3 33.e5 Qxe5 (33... d2 34.Rxf6+ followed eventually by Rd1 wins) 34.Rc7+ Re7 (34... Qxc7 35.Rxf6+ Ke7 36.Qg7#; 34... Kf8 35.Qg7#; 34... Rd7 35.Rxd7+ Re7 36.Qxe5 wins) 35.Qxe5 winning.

I haven't found the time for more.

May-06-17  schachfuchs: Not a very instructive puzzle with one conclusive solution imho.
May-06-17  Walter Glattke: Carlsen would see that, playing 33.e5 Qb6+ 34.Kh1 Re6 35.Rxf6+ Rxf6 36.Rc7+ Ke8 ("Carlsen") - could fail, that Rc7-attack!
May-06-17  RandomVisitor: After 21...h6!

click for larger view

Komodo-10.1-64bit: <4 hours computer time>

-2.09/39 22.Qe5 f6 23.Qg3+ Bg7 24.Qg6 Qe7 25.Rfe1 Ne4 26.Bxe4 dxe4 27.Qxe4 f5 28.Qb1 Rxc1 29.Rxc1 Rd8 30.Qc2 Kh7 31.Bxg7 Qxg7 32.b6 Rc8 33.Qb1 Rc3 34.h3 Rb3 35.Qa2 Qe5 36.Qd2 Bd5 37.Qd4 Qxd4 38.exd4 Rd3 39.Rc5 Rxd4 40.Rxa5 Kg6 41.Kh2 Bc6 42.f3 f4 43.h4 Rd3 44.Kh3 Bd7+ 45.Kh2 Rc3 46.Ra7 Bc6 47.Ra8 Re3

May-06-17  JeffCaruso: <morfishine: Funny series of moves with the rook going back and forth between <f4> & <f5> before White finally figures it out> This is typical play when low on time and near the time control at move 40 - you get an extra 2 moves closer to the time control while expending very little time on the clock.
May-06-17  RandomVisitor: A final look, after 32.Qh6 Rf8 33.Re1

click for larger view

Komodo-10.1-64bit: <5 hours computer time>

+0.58/39 33...Ke7 34.e5 Nd5 35.Qxh7+ Ke8 36.Rxd4 Rd7 37.Qh5+ Kd8 38.Qh4+ Kc8 39.Qf2 Kb8 40.h3 Nf4 41.Ree4 Nd5 42.Qd2 Rc8 43.Kh2 Rc5 44.Qxa5 b6 45.Qd2 Rxb5 46.f4 Rc5 47.Re1 Rd8 48.Rc1 Rd7 49.Qe1 Qc6 50.Rxc5 Qxc5 51.Rd1 Rg7 52.Qd2 Ne3 53.Qd8+ Kb7 54.Rd7+ Rxd7 55.Qxd7+ Kb8 56.Qd8+ Kb7 57.Qd3 Nd5 58.Qh7+ Kc6 59.Qf7 Ne7

+0.60/39 33...Qe5 34.Rf5 Qe6 35.Qxh7+ Ke8 36.Qxb7 d3 37.Rd1 Rd6 38.b6 Nd7 39.Qc8+ Ke7 40.Rxf8 Nxf8 41.Qc3 Rxb6 42.Qxd3 Kf7 43.Qd4 Qc6 44.Qd5+ Qxd5 45.Rxd5 a4 46.Rf5+ Ke7 47.Ra5 Ng6 48.Ra7+ Ke6 49.Kf2 Nf4 50.Kg3 Ne2+ 51.Kg4 Rb2 52.Rxa4 Nc3 53.Ra6+ Ke5 54.Ra5+ Kd4 55.Kh3 Ke3 56.e5 Ne2 57.e6 Nf4+ 58.Kg4 Rxg2+ 59.Kf5 Kxf3 60.Rb5 Re2 61.Rb3+ Re3 62.Rxe3+

+1.15/39 33...d3 34.e5 Ke8 35.Rxf6 Rxf6 36.Qxf6 Qxf6 37.exf6+ Kf7 38.Kf2 a4 39.Ke3 Rd5 40.Rd1 Kxf6 41.b6 Rd6 42.g4 Ke6 43.Ke4 d2 44.f4 h6 45.h4 Kf6 46.h5 Rd8 47.Ke3 Rg8 48.Rxd2 Rxg4 49.Ke4 Ke6 50.Rd4 Rg3 51.Rxa4 Rb3 52.Ra8 Rxb6 53.Rh8 Kf7 54.Rh7+ Kg8 55.Rd7 Ra6 56.Rxb7 Rxa3 57.Kf5 Ra4 58.Kg4 Ra5 59.Rc7 Ra4

Premium Chessgames Member
  patzer2: <Random visitor> After 32.Qh6 Rf8 33.Re1 Ke7 34.e5 Nd5 35.Qxh7+ Ke8 36.Rxd4 Rd7 37. Qh5+ Ke8, Stockfish 8 @ 34 depth is preferring 38. Red1 (+1.20 @ 34 depth) over 38. Qh4+ (+0.58 @ 34 depth) which was the Komodo 10.1 choice and evaluation @ 39 depth for this line.

What does Komodo 10.1 assess when you pick 38. Red1 (diagram below)

click for larger view

over 38. Qh4+ in this line?

Premium Chessgames Member
  patzer2: <Random Visitor> Ran Stockfish 8 to 40 depth on position above after 32.Qh6 Rf8 33.Re1 Ke7 34.e5 Nd5 35.Qxh7+ Ke8 36.Rxd4 Rd7 37. Qh5+ Ke8 38. Red1

The result was 38.Red1 Kc7 39.Qg4 Qxg4 40.fxg4 Nb6 41.e6 Rxd4 42.Rxd4 Rd8 43.e7 Re8 44.h4 Rxe7 45.g5 Rd7 46.Rg4 Nc8 47.h5 Ne7 48.Rc4+ Kd6 49.Rf4 Ke5 50.Rf8 Nf5 51.h6 Rh7 52.g4 Nxh6 53.gxh6 Rxh6 54.Kg2 Rd6 55.Kg3 Ke6 56.Rf3 Rd5 57.a4 Rd4 58.Rf4 Rb4 59.g5 Rb3+ 60.Kf2 Rb4 61.Kf3 Rb3+ 62.Ke2 Rb4 63.Ke3 Rb3+ 64.Kd2 Rb4 65.Rf6+ Ke5 = (diagram below)

click for larger view

The Fritz assessment of this final position in the 40 depth Stockfish analysis of 32.Qh6 Rf8 33.Re1 Ke7 34.e5 Nd5 35.Qxh7+ Ke8 36.Rxd4 Rd7 37. Qh5+ Ke8 38. Red1 is dead level equal (0.00 @ 57 depth, Stockfish 8 x 64.)

P.S.: So it would seem 32...Rf8 would have given a very strong Black player reasonable chances of surviving with a draw.

May-09-17  Moszkowski012273: No way should 19.Ngh5... of worked. Both 21...h6 and 21...Ne4 give a serious plus to Black. ALSO- 28...Nc3 giving the King the h8 square looks VERY promising.
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