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Sergey Ionov vs Anton Loginov
Petroff mem op (2000), St. Petersburg RUS, rd 1, Feb-07
Queen's Gambit Declined: Exchange. Positional Variation (D35)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Jun-16-21  alshatranji: Is this supposed to be a Wednesday puzzle? Too early? No comments? Something weird is going on.
Jun-16-21
Premium Chessgames Member
  Willber G: There is a system upgrade taking place. Have a look here:

chessgames.com chessforum (kibitz #35707)

Jun-16-21  Walter Glattke: A) 24.-Nxf4 25.cxb7 Nh3+ 26.Kg2 Qf3#
B) 24.-Nxf4 25.gxf4 Qxf4 26.Be2 Qg5+ 27.Kh1 Bh3 28.Ne3 Qxe3 29.Qc2 Qf2 30.Be3 Bg2# C) 26.Qa3 Qg4+ 27.Kh1 Qf3+ 28.Kg1 Bh3 29.Be4 Qf1# or 29.Qxf8+ Kxf8 30.Ne3 Qxe3+ 31.Kh1 Qf3+ 32.Kg1 Qg2#
Jun-16-21
Premium Chessgames Member
  agb2002: Black is one pawn down.

The white castle is weak and poorly defended. This suggests 24... Nxf4:

A) 25.gxf4 Qxf4

A.1) 26.cxb7 Qg4+ 27.Kh1 Qf3+ 28.Kg1 Bh3 29.Qc2 Qf1+ 30.Bxf1 Rxf1#.

A.2) 26.Ra2 Bh3

A.2.a) 27.Rf2 Qg4+ 28.Kh1 Rxf2 wins.

A.2.b) 27.Nf2 Qg5+ 28.Ng4 Qxg4+ 29.Kh1 Qf3+ 30.Kg1 Qf1+ 31.Bxf1 Rxf1#.

A.2.c) 27.Rg2 Bxg2 28.cxb7 (28.Kxg2 Qxf3+ 28.Kg1 Qxd3 29.Nf2 Qe2 wins) 28... Bf1 29.Qc2 Qg4+ 30.Kh1 Bg2+ 31.Qxg2 (31.Kg1 Be4+ 32.Qg2 Qxg2#) 31... Qxd1+ 32.Qg1 (32.Bf1 Rxf1+ and mate next) 32... Qxd3 wins decisive material.

A.3) 26.Qc2 Qxd4+ and 27... Qxa1 wins decisive material.

A.4) 26.Qa2 Qxd4+ and 27... Qxd3 wins decisive material.

B) 25.cxb7 Nh3+ 26.Kg2(h1) Qf3#.

C) 25.Bf1 Nh3+ 26.Bxh3 Bxh3 27.Ne3 (27.Qb5 Qf3 28.Ra2 Qxd1+ and mate in two) 27... Qf2+ 28.Ka1 Qxe3 29.Qd1 Qf2 30.Bf1 Bxf1 31.Qxf1 Qxf1+ 32.Rxf1 Rxf1 33.Kg2 Rb1 34.c7 Rc1 wins.

Jun-16-21  Brenin: 24 ... Nxf4 is easy to see, but its non-forcing nature, together with that of the follow-up 25 gxf4 Qxf4, leading to a wide range of possible White responses (see <agb2002>'s analysis) make this quite hard for a Tuesday.
Jun-16-21  saturn2: Instead of defending against f4 white continued his queenside attack by 18.Qa4
Jun-16-21  Nov8: Can't avail the chess engine analysis?
Please restore!
Jun-16-21
Premium Chessgames Member
  agb2002: I should have carried out the analysis a bit further in my line A.4: 26.Qa2 Qxd4+ 27.Nf2 Rxf2 28.Qxf2 Qxa1+ followed by bxc6 wins decisive material.
Jun-16-21  Cheapo by the Dozen: Black leaves White with 2 tempi in which to try to stop devastation on 3 different squares (f1, f2 and g2). It wasn't hard to see that straightforward defenses would all fail. But I admit to not thinking of the Qa3 tactic, which threatens Qxf8+ (which in turn has teeth because of the cb followup and consequent mayhem in the a8/b8 area), and also has the potential for Qg3 or to cover the h3 square to which Black's bishop heads in the main lines.
Jun-16-21  mel gibson: That's another easy one.

Stockfish 13 says:

24... Nxf4

(24. .. Nxf4
(♘h5xf4 g3xf4 ♕f6xf4 ♕a4-a2 ♕f4xd4+ ♘d1-f2 ♖f8xf2 ♕a2xf2 ♕d4xa1+ ♔g1-g2 b7xc6 ♕f2-e3 ♕a1-b2+ ♔g2-g3 ♕b2-b8+ ♔g3-f3 ♗c8-h3 ♕e3-e7 ♕b8-f8+ ♕e7xf8+ ♔g8xf8 ♔f3-f4 ♔f8-e7 ♔f4-e5 ♗h3-e6 ♗d3-b1 c6-c5 ♗b1-c2 ♔e7-f7 ♗c2-a4 h7-h6 ♗a4-d1 d5-d4 ♗d1-c2 g6-g5 ♔e5-d6 ♔f7-f6 ♔d6xc5 ♔f6-e5 ♗c2-g6 g5-g4 ♔c5-b4 ♗e6-f5 ♗g6-e8 ♔e5-e4 ♗e8-f7 d4-d3 ♔b4-c3 ♔e4-e3 ♗f7-e8 d3-d2 ♗e8-a4 h6-h5 ♗a4-d1 h5-h4 ♗d1-a4 g4-g3 h2xg3 h4xg3 ♗a4-c6) +8.05/46 511)

score for Black +8.05 depth 46

Jun-16-21  cocker: 26 Qa2 limits White's losses to pawns.
Jun-16-21  stacase: Pretty easy for a Wednesday.
Jun-16-21
Premium Chessgames Member
  chrisowen: Nitwits key i Nxf4 gib ace its method and here its rev nitwits king its brag a key harmful fit wins qcs its podium i key o volume its ko laggy rude its evict men cook i key few feminine hitz cars again o key totups gib gestate key i fiddle idiom iam gig jet cow its finisher Nxf4 doh?
Jun-16-21
Premium Chessgames Member
  gawain: I was looking for something forcing, and did not see any candidate moves at all. But it turns out that Black has time for a fairly slow attack!
Jun-16-21  Tiggler: < cocker: 26 Qa2 limits White's losses to pawns.> 26. Qa2 Qxd4+
27. Nf2 Rxf2
28. Qxf2 Qxa1+
29. Kg2 bxc6

Ought to be plenty.

Jun-16-21  Cellist: I saw the first two moves but then wanted to play Qxd4+, which seems to be a strong alternative to the text move according to the SF 13 analysis provided by <mel gibson>.
Jun-16-21  saturn2: <agb2002 25.Bf1 Nh3+ 26.Bxh3 Bxh3 27.Ne3 (27.Qb5 Qf3 28.Ra2 Qxd1+ and mate in two) 27... Qf2+ 28.Ka1 Qxe3 29.Qd1 Qf2 30.Bf1 Bxf1 31.Qxf1 Qxf1+ 32.Rxf1 Rxf1 33.Kg2 Rb1 34.c7 Rc1 wins.> The white bishop gets traded at move 26 and at move 30 it is there again.
Jun-17-21
Premium Chessgames Member
  agb2002: <saturn2: <agb2002 25.Bf1 Nh3+ 26.Bxh3 Bxh3 27.Ne3 (27.Qb5 Qf3 28.Ra2 Qxd1+ and mate in two) 27... Qf2+ 28.Ka1 Qxe3 29.Qd1 Qf2 30.Bf1 Bxf1 31.Qxf1 Qxf1+ 32.Rxf1 Rxf1 33.Kg2 Rb1 34.c7 Rc1 wins.> The white bishop gets traded at move 26 and at move 30 it is there again.>

The odd case of the reincarnated bishop... Sounds like a story by G. K. Chesterton...

But seriously, thank you for pointing out this hallucination.

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