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Alaa-Eddine Moussa vs Anvar Nazarov
Olympiad (2008), Dresden GER, rd 8, Nov-21
Queen Pawn Game: Zukertort Variation (D02)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
May-18-18  SpamIAm: <Cheapo by the Dozen>, after 44...Qe5+ (instead of 44...Rh1+ as played in the game), 45.Qf4! saves everything, e.g. 45...Qxe6 46.Qxf8+. Or if 45...Qxf4+ 46.Nxf4 protects the bishop at e6.
May-18-18  stacase: 42...Qa1 threatens mate and was easy to see. 45...Rh3+ is where I parted company and is less obvious.
May-18-18
Premium Chessgames Member
  mike1: jimfromprovidence: SF says mate in 11:

1) mate-in-11 (25 ply) 50...Nh4+ 51.Kg5 h6+ 52.Kh5 Kh7 53.Bg8+ Kxg8 54.Qc7 Qh1 55.Qxg7+ Kxg7 56.Rc7+ Kf6 57.Rc1 Qxc1 58.Kxh6 Nf5+ 59.Kh7 Qc7+ 60.Kg8 Qg7#

May-18-18
Premium Chessgames Member
  ChessHigherCat: <JimfromProvidence> If 50. Qxc5 then Nh4+ 51. Kg5 h6+ 52. Kh5 Kh7 53. Bf5+ Nxf5#
May-18-18
Premium Chessgames Member
  ChessHigherCat: <mike1> I didn't look at 53. Bg8+, which prolongs the agony a bit.
May-18-18  cocker: You wonder how far ahead Black calculated when playing 42 ... Qa1.
May-18-18
Premium Chessgames Member
  WorstPlayerEver: After exploring 42... Qa1 43. Bxe6+,
I had a hard time finding 42... Qa1 43. g4 Rh1+ 44. Kg3 Rxh3+ 45. Kxh3 Qh1+ 46. Kg3 Qxg2

It's still a tricky line. Although Black clearly is winning.

May-18-18
Premium Chessgames Member
  WorstPlayerEver: PS ghe it comes down to the same pattern. I just missed the right 43. Bxe6+ line. Went for Qe5+ instead of Rxh3+, but then White simply plays Kxf3.
May-18-18
Premium Chessgames Member
  ChessHigherCat: <cocker: You wonder how far ahead Black calculated when playing 42 ... Qa1.>

I bet he only calculated this line (like me :-):

42.Qc4 Qa1 43. Bxe6+ Kh8 44. g4 Rh1+ 45. Kg3 Bxg2, which intuitively looks good and wins a piece (46.Kxg2 Qg1+ 47.Kf3 Qd1+ 48.Kg3 Qd6+ 49.Qf4 Qxf4+ 50.Kxf4 Nxe6+)

and then saw he could get away with 45...Rh3+ when he got there

May-18-18  clement41: The obvious question every kibitzer must be wondering while going over the 50th move is why not the natural-looking Qxc5. Then there’d follow
50...Nh4
51 Kg5 h6
52 Kh5 Kh7!!
threatening mate, when there is no satisfying way to parry. e.g. 53 Bf5 Nf5# or 53 Qc7 Nf5 54 Qh2 g6#
May-18-18
Premium Chessgames Member
  malt: Looked at 42...Qh4 threatening 43...Q:h3+ and...Rh1# but 43.Rc1 spoilt it.

Have gone for 42...Qa1

May-18-18  schachfuchs: Same as <al wazir>: I was sure about my line until 48...Ng6+ but then missed the continuation 49...Qh2. Pretty hard for a friday! Almost insane?!
May-18-18
Premium Chessgames Member
  malt: Went for 42...Qa1 43.B:e6+ Kh8 44.g4 Rh1+
45.Kg3 Ng6!
46.Nf4 (46.K:f3 Ne5+ )46...Ne5
May-18-18
Premium Chessgames Member
  whiteshark: You lost me halfway...
May-18-18
Premium Chessgames Member
  Richard Taylor: I saw this but I thought that either 49...Bd1 which wins (computer it seems) I see now or possibly 49...h5 there was a win but I couldn't see any clear win. I missed 49. ... Qh2

But in any case I was sure that Qa1 etc as played was the way to a win somehow it only needed a lot of calculation. Very good by Black altho I am not sure his Qh2 was correct...

May-18-18
Premium Chessgames Member
  Richard Taylor: Oh well according to the onboard machine it looks as though Black had it all worked out. He should have been able to with enough time as he is a IM. But it is hard to see accurately that far.

Some hard thinking in that game! Perhaps he took off his watch and had a big think!

May-18-18
Premium Chessgames Member
  Richard Taylor: <diagonalley: simply breathtaking... (although it's hard to guess how far ahead white had calculated)> You mean Black?

I once saw a (probably slightly less complicated game) between an IM and GM Murray Chandler who made a sacrifice and won. I asked him if he worked everything out or went by the position to some extent. His answer was that he did calculate everything. (Because otherwise it was embarrassing and indeed tragic to find you had stuffed up, or something to that effect).

But I would say there are positions where it is a mixture of both. When calculation is mixed with intuition or 'sense of the position, or the possibilities'.

(White just had to work things out and hope there was a way out. Without a computer I would have no idea except for the moves up to where the King gets to f5 and then it is easy to forget where things are, although it looks winning. My feeling is that as it was a team game the IM made sure it was going to work and calculated everything. But no one knows. He might have calculated some of it and said, "Well, how often do I get such a beautiful attacking series of moves etc in?" Something like that.)

May-18-18
Premium Chessgames Member
  patzer2: Like several others, I went for 42...Qh5 -+ (-2.69 @ 24 ply, Stockfish 9 analysis of move 43.?) which apparently wins with difficulty.

However, 42...Qh5 -+ is not as strong as the game continuation and today's Friday puzzle solution 42...Qa1 -+ (-4.91 @ 23 ply, Stockfish 9 analysis of move 43.?).

May-18-18  takchess: Not even a clue of a clue....
May-18-18  Marmot PFL: It seemed much too easy up to move 43 when it gets rather complicated. By move 49 I wasn't even sure black had perpetual but black saw farther.
May-18-18
Premium Chessgames Member
  agb2002: Black has an extra pawn.

White threatens Qxc5 and Rc1.

White's back rank is defenseless which suggests 42... Qa1:

A) 43.Bxe6+ Kh8 44.g4 Ng6

A.1) 45.Qxc5 Rh1+ 46.Kg3 Rh3+ 47.Qh1+ Kg3 48.Qxg2#.

A.2) 45.g5 Rh1+ 46.Kg3 Qg1

A.2.a) 47.Kxf3 Ne5+ followed by 48... Nxc4 wins decisive material.

A.2.b) 47.Bh3 Rxh3+ 48.Kxh3 Qxg2#.

A.3) 45.Nf4 Rh1+ 46.Kg3 Qg1+ 47.Kxf3 Ne5+ as in A.2.a.

B) 43.g4 Rh1+ 44.Kg3 Rxh3+ 45.Kxh3 Qh1+ 46.Kg3 Qxg2+

B.1) 47.Kh4 Qh2+ 48.Kg5 Qh6+ 49.Kf5 Qf6#.

B.2) 47.Kf4 Ng6+ 48.Kg5 h6+

B.2.a) 49.Kxg6 Be4+ 50.Qxe4 (50.Kh5 Qh3#) 50... Qxe4+ wins.

B.2.b) 49.Kh4 Qh2#.

B.2.c) 49.Kh5 Qh1+ 50.Kxg6 Be4+ 51.Qxe4 Qxe4+ wins.

May-18-18  mel gibson: I got distracted by Black trying to save its passed pawn on c5.

Stockfish 9 says mate in 38

(42. .. Qa1
(♕e5-a1 ♗h3xe6+
♔g8-h8 g3-g4 ♖d1-h1+ ♔h2-g3 ♖h1-h3+ ♔g3xh3 ♕a1-h1+ ♔h3-g3 ♕h1xg2+ ♔g3-f4 ♘f8-g6+ ♔f4-f5 ♗f3-d1 ♖c2-b2 ♗d1-c2+ ♖b2xc2 ♕g2-f3+ ♕c4-f4 ♘g6xf4 ♔f5-e5 ♘f4-g6+ ♔e5-d6 ♕f3-d1+ ♔d6-c7 ♕d1xc2 f2-f4 ♕c2-e4 f4-f5 ♕e4-e5+ ♔c7-c6 ♕e5xe6+ f5xe6 c5-c4 e3-e4 c4-c3 ♔c6-d7 c3-c2 e6-e7 ♘g6xe7 ♔d7xe7 c2-c1♕ e4-e5 ♕c1-g5+ ♔e7-e6 ♕g5xg4+ ♔e6-d5 ♕g4-h4 e5-e6 ♕h4-g3 e6-e7 ♕g3-g6 ♔d5-e5 ♕g6-f6+ ♔e5-e4 ♕f6xe7+ ♔e4-f4 ♕e7-e2 ♔f4-g3 g7-g5 ♔g3-h3 g5-g4+ ♔h3-h4 ♕e2-f3 ♔h4-h5 g4-g3+ ♔h5-g5 g3-g2 ♔g5-h6 ♕f3-e3+ ♔h6-h5) +M38/46 196)

May-26-18  cormier: Analysis by Houdini 4
16.c5 bxc5 17.Nxc5 Nxc5 18.Qxc5 Ng6 19.Nd3 Be7 20.Qc3 f4 21.e3 fxe3 22.fxe3 Rb8 23.Rf1 Rxf1+ 24.Rxf1 Qd6 25.Bc1 Bf7 26.Bh3 Bf6 27.Ba3 Qd7 28.Nc5 Qd6 29.Kg2 Rf8 30.Bb2 Ne7 31.Qd2 Nf5 32.Bxf5 exf5 33.Rxf5 + / = (0.67) Depth: 22
May-26-18  cormier: Analysis by Houdini 4
17...c5 18.Nxg6 Bxg6 19.dxc5 bxc5 20.bxc5 Bxb2 21.Qxb2 dxc4 22.Ne5 Qf6 23.f4 Rxc5 24.Bxe4 fxe4 25.Qc3 Bh5 26.Qd4 Rc7 27.Qxe4 c3 28.Rac1 Qf5 29.Qe3 c2 30.Rd6 Rfc8 31.Qd4 Be8 32.e4 Qf6 33.a5 Rb7 34.Kg2 Qe7 35.Qd2 = (0.20) Depth: 20
May-26-18  cormier: Analysis by Houdini 4
21.e3 fxe3 22.fxe3 Qg5 23.Rf1 h6 24.Qe2 Ra8 25.Rxf8+ Nxf8 26.Nf4 bxc5 27.bxc5 Qe7 28.e4 Qd7 29.Bh3 Rb8 30.Rf1 Bf7 31.Bg4 a5 32.exd5 cxd5 33.Qc2 Qc7 34.Nh5 Nxe5 35.Be2 Nfd7 + / = (0.30) Depth: 20
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