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Genrikh Chepukaitis vs Evgeny Shaposhnikov
St Petersburg-ch 73rd (2000), rd 10, Apr-12
Tarrasch Defense: Two Knights Variation (D32)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
Mar-27-21
Premium Chessgames Member
  An Englishman: Good Evening: A little easy for a weekend puzzle, esp. given the fact that 22...Ng6 is so astonishing it looks like a typo.
Mar-27-21  Cheapo by the Dozen: The first move is easy -- the rook is obviously poisoned, and declining it without guarding g3 also fails horribly. So White's game move is clearly forced.

But I got various details wrong after that.

Mar-27-21
Premium Chessgames Member
  al wazir: The first move is easy to find. After 32. Qe1 it gets harder.

What does black do after 33. Ne3 ?

Mar-27-21  Walter Glattke: I m totally embarrassed, black sacs for Qg3 and Rf1# 33 .Ne3 Qg4 34.Nf1 Rxf1 35.Bxf1 Qf4+ 36.Kg1 d2 /34.Bxf3 Rxf3 35.Ng2 d2 or 35.Nf1 d2 (always 36.Rc8+ Kh7) 36.Nxd2 Rg3+ 37.Qxg3 hxg3
Mar-27-21  Brenin: <al wazir>: 33 Ne3 Qg5, and the N cannot be defended, e.g. 34 Nf5 Rxg2+ 35 Kh1 d2 or 34 Ng4 d2 35 Qe2 Qf4, with an easy win for Black in either case.
Mar-27-21  mel gibson: Stockfish 13 says Black wins
mate in 20.

31... Rf3

(31. .. Rf3 (♖f4-f3 ♕e3-g1 ♖f3-g3 ♔h2-h1 ♕g6-g5 ♖c4-c7 ♕g5-d2 ♖c7xa7 ♖f8-f3 ♖a7xg7+ ♔g8xg7 ♗g2xf3 ♖g3xg1+ ♔h1xg1 ♕d2-e1+ ♔g1-g2 ♕e1-g3+ ♔g2-f1 ♕g3xf3+ ♘d1-f2 d3-d2 ♔f1-g1 d2-d1♕+ ♘f2xd1 ♕f3xd1+ ♔g1-f2 ♕d1-d2+ ♔f2-f3 ♕d2xb2 a2-a3 b4xa3 ♔f3-e3 ♕b2-c3+ ♔e3-e2 a3-a2 ♔e2-f1 ♕c3-c2 ♔f1-e1 a2-a1♕+) +M20/69 1546)

Mar-27-21
Premium Chessgames Member
  agb2002: Black has a rook and two pawns for a bishop and a knight.

White threatens Qxd3 and Rxb4.

The white queen controls g3. This suggests, 31... Rf3:

A) 32.Bxf3 Qg3+ 33.Kh1 Rxf3 34.Qxf3 (34.Qg1 Qxh3+ 35.Qh2 Rf1#) 34... Qxf3+ and 35... Qxd1 wins decisive material.

B) 32.Qe1 d2

B.1) 33.Qxd2 Qg3+ 34.Kh1 (34.Kg1 Rf1#) 34... Rf1+ 35.Bxf1 Rxf1#.

B.2) 33.Qg1 Qg3+ 34.Kh1 Rf2 (34... Qe1, threatening Rf1, is met with 35.Rc8 Rxc8 36.Bxf3, controlling d1)

B.2.a) 35.Nxf2 Qxf2 36.Qxf2 (due to 36... Qxg1+ 37.Kxg1 d1=Q+) 36... Rxf2 37.Rc8+ Rf8 38.Bf3 Rxc8 winning decisive material.

B.2.b) 35.Rc8 Rxc8 36.Qxf2 (36.Nxf2 Qxf2 37.Qxf2 d1=Q+ ends an exchange and a pawn up) 36... Qxf2 37.Nxf2 Rc1+ again an exchange and a pawn ahead.

B.3) 33.Qh1 Qg3+ 34.Kg1 Rf1#.

C) 32.Qxf3 Rxf3 33.Bxf3 Qg3+ wins decisive material.

Mar-27-21  Refused: 31...Rf3! screams out to be played.
a)32.Bxf3 Qg3+ 33.Kh1 Qxh3+ (why not?) 34.Kg1 Qg3+ 35.Kh1 Rxf3 36.Rc8+ Kh7 -+ white still has to deal with the threat of Rf1# 37.Qg1 Qh3+ 38.Qh2 Rf1# doesn't help.

b) 32.Qe1 Rg3 33.Qd2 Rxh3+ 34.Kg1 (Bxh3 Qg3+ gets mated again) Rg3 35.Kh2 h3! 36.Bxh3 Qh5 37.Kg3 Rf3+ 38.Kg2 Qxh3+ 39. Kg1 Rg3+ 40.Kf2 Rg2+ and 41...Qh1#

c)32.Qg1 Rg3 the attack will just continue 33.Rc1 Rff3 (pretty much the response to any white move) 34.Nf2 Qg5 35.Bxf3 (otherwise Qf4 kills) Rxg1 36.Rxg1 Qf4+ 37.Kg2 Qg3+ 38.Kf1 Qxf3 -+

Mar-27-21  Refused: <agb2002> if you play 32.Qe1 d2 you have to give a line 33.Qxh4 which is kinda the point.
Mar-27-21
Premium Chessgames Member
  agb2002: I overlooked 33.Qxh4 in my line B. Better luck tomorrow.
Mar-27-21
Premium Chessgames Member
  chrisowen: Dame in Rf3 flushy able in lee it way in duff coat fact mate dame cogs dabs made in time wintry quarks luv i flush happy its coins bend hilt rummage zip in i adds grub abattoir enough agile it wagers hi tole it pretty Rf3 bug?
Mar-27-21  Cellist: Yes, the first move was easy. I also chose the second one because I saw no better option (I briefly considered 32. ... d2, but this helps little after 33. Qxh4). I would have continued with 33. ... Rff3, which also wins.
Mar-27-21  RandomVisitor: 26.Qc5 seems to hold for white


click for larger view

Stockfish_21032417_x64_modern:

<48/80 07:53 +0.50 26.Qc5 Kh8 27.Rg3 Qf6 28.Ne3> Bxe4 29.Bxe4 Rxe4 30.Nxc4 Rg8 31.Ne3 Rf8 32.Kh1 d2 33.Qc2 Rd4 34.Rd1 Qd8 35.Rg2 Rf3 36.Nf5 Rf1+

Mar-27-21  RandomVisitor: 27.Qxa7 holds,


click for larger view

Stockfish_21032417_x64_modern:

<55/78 03:38 -0.00 27.Qxa7 Rf8 28.h3 Bxe4 29.Ne3> d2 30.Qc5 Qh4 31.Kh2 Bxg2 32.Rxg2 Rd8 33.Qxe5 Qf6 34.Qxf6 Rxf6 35.Rag1 g6 36.Nd1 Rc6 37.Rg3 Ra8

...even 28.Qxa7:


click for larger view

Stockfish_21032417_x64_modern:

<70/65 1:51:19 -0.00 28.Qxa7 Bxe4 29.Ne3 d2 30.Qc5> Qh4 31.Kh2 Bxg2 32.Rxg2 Rd8 33.Qxe5 Qf6 34.Qxf6 Rxf6 35.Rag1 g6 36.Nd1 Rc6 37.Rg3 Ra8 38.a3 c3

Mar-27-21
Premium Chessgames Member
  al wazir: <Brenin: 33 Ne3 Qg5, and the N cannot be defended>.

Then 34. Ng4.

Mar-27-21  areknames: < <Brenin: 33 Ne3 Qg5, and the N cannot be defended>.

Then 34. Ng4.>

Then 34...d2 35.Qe2 Qf4 and Black eventually both promotes and mates quickly.

Mar-27-21  Brenin: <al wazir>: After 33 Ne3 Qg5 34 Ng4, I think 34 ... d2 wins, e.g. 35 Qe1 Qf4 36 Kh1 Rxg2 37 Kxg2 Qg3+ 38 Kh1 Qe1+, with mate in a few more moves.
Mar-27-21
Premium Chessgames Member
  Breunor: Al Wazir,

On 33 Ne3 Qg5 34 Ng4 white gets devastated by d2 and then the black Queen goes to f4; when the king moves to avoid the discovered check, black takes on g2, moves the queen to g3 and then it is all over.

The main variation the computer gives is:
1) mate-in-13 (26 ply) 34...d2 35.Qe2 Qf4 36.Nf6+ gxf6 37.Kg1 Qe3+ 38.Qxe3 d1=Q+ 39.Kf2 Rxe3 40.Kxe3 Rd8 41.Rc8 Qe1+ 42.Kf3 Qg3+ 43.Ke2 Qxg2+ 44.Ke3 Rxc8 45.a3 Rc2 46.axb4 Qxh3#

On 36, if white decides just to move the king, say Kh1, we have 36 Rxg2. If Qxg2 the pawn queens on d1; if the king takes black wins with Qg3, the main theme here.

After d2, if white plays say Qe1, we have similar themes:

1) mate-in-9 (29 ply) 35...Qf4 36.Kh1 Rxg2 37.Rc2 Qg3 38.Nf6+ gxf6 39.Qg4+ Qxg4 40.hxg4 Re2 41.Rxd2 Rxd2 42.Kg1 Rc8 43.Kh1 Rc1#

Like everyone else, I saw Rf3 right away. I didn't see every possible variation.

Mar-27-21  mel gibson: <Breunor: Al Wazir,
Like everyone else, I saw Rf3 right away.>

I saw it straight away then stopped looking at that line because I thought that the White Bishop on g2 would take the Rook. I was wrong because that would lead to mate in 13 as per here with Stockfish 13.
In other words it was a deceptive position.

(32.Bxf3 Qg3+

(♕g6-g3+ ♔h2-h1 ♖f8xf3 ♖c4-c8+ ♔g8-h7 ♕e3xf3 ♕g3xf3+ ♔h1-g1 ♕f3-g3+ ♔g1-f1 ♕g3xh3+ ♔f1-e1 ♕h3xc8 ♘d1-f2 ♕c8-c1+ ♘f2-d1 h4-h3 ♔e1-f2 ♕c1-f4+ ♔f2-g1 ♕f4-g3+ ♔g1-f1 ♕g3-g2+ ♔f1-e1 ♕g2-e2+) +M13/85 36)

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