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Surya Shekhar Ganguly vs Pavel Tregubov
Paul Keres Memorial (2016) (rapid), Tallinn EST, rd 9, Jan-10
French Defense: Winawer. Poisoned Pawn Variation Main Line (C18)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Aug-12-17  Cheapo by the Dozen: I actually saw Be3, but failed miserably at the puzzle anyway for a remarkably stupid reason -- when counting initial material, I didn't notice that White had one more rook than Black! So I thought ... Nc2+/Nxa1 and ... Nxe2 were both threats that put Black way ahead in material.
Aug-12-17
Premium Chessgames Member
  patzer2: Got the first three moves of today's Saturday puzzle with <25. Be3! Nxc2+ 26 Ke2 d4,> but instead of the game move <27. Nxd4+> +- (+2.53 @ 35 depth, Stockfish 8) I went for 27. Rxe6+ +- (+3.93 @ 35 depth, Stockfish 8.)

For a Black improvement, the computer indicates 22...Ne7 = should be good for a draw as White apparently has nothing better than the perpetual with 22...Ne7 23. Rh8 Qc5 24. Qd8+ Kc6 25. Qe8+ Kc7 26. Qd8+ = (0.00 @ 127 depth, Stockfish 8.)

Aug-12-17  ChessHigherCat: <watwinc: My kibitz seems to have vanished. I’m sleepy here, but what’s wrong with 30 … Qe6 instead of Qa4?>

Maybe Qe6 31. Qh1+ Kd6 32 Qxb7, although Black would have Qa2+ and white has to be careful to avoid the N fork afterwards: Kf1 and if Qa1/a2+, then Rc1

Aug-12-17
Premium Chessgames Member
  al wazir: I spent a *long* time considering 25. Be3, but rejected it in favor of 25. Kf2. If 25...Nxc2, then 26. Ra2 wins the ♘. If 25...Nxe2, 26. Be3 again traps the ♘, and now 26...d4 transposes into the game line. I think black has nothing better than 26...Nxf4 27. Bxf4.

Either way, white ends up with ♖ vs. ♙+♙+♙+♙. Not overwhelming, but probably good enough for the point. It's no worse than the game white has after <25. Be3 Nxc2+ 26. Kf2> with the continuation 26...Nxa1 27. Nd4+ Kc7 28. Nxe6+ fxe6.

Aug-12-17  groog: Found the first move...... from then on it was a mystery.
Aug-12-17
Premium Chessgames Member
  Richard Taylor: I found 25. Bf3 but missed Nxc2 so I went back and missed d4. But still 25. Be3 looks essential there to break the pin and threaten 26. Nxd4+ so I would have played it in a real game I think if I had enough time.

Quite an ingenious combination by Gangully.

I played against him in two simuls. The games were interesting. He is quite a likeable fellow.

Aug-12-17
Premium Chessgames Member
  Richard Taylor: <groog> you did well! Basically you really only have to find the main idea of move 1. The rest is intuition. Calculation is for brainy people who like everything to be predictable...
Aug-12-17
Premium Chessgames Member
  Richard Taylor: It was certainly a tough one to work out. Required a lot of concentration. Too many lines for me: mind you sometimes these things are paradoxically easier to see in an actual game. Usually people try things like this, miss this line and that, find some good ideas and get lucky in some cases. But I am talking about the average wood pusher like myself. Otherwise it is for these very clever people such as Gangully and others even higher up the ladder so to speak.

Very difficult indeed, difficult to visualise.

Aug-12-17  Caissas Clown: WOW !
I like how the position begins with White's Knight pinned to his King by a Rook , then seven moves later , we see the same motif with colours reversed.
Aug-12-17  Walter Glattke: White has a rook for three pawns, 25.-Rxh6 26.Nxd4+ Kc7 27.Qxh6 or 25.-Nxe2 26.Rxe6+ Qxe6 27.Kxe2 Ba6+
28.Kf2 Qc4 29.Re1 +-
Aug-12-17  morfishine: One of the funnest, most interesting POTD, like a pinball game lol

*****

Aug-12-17
Premium Chessgames Member
  patzer2: If Black gets greedy and grabs material with 26...Nxa1? (diagram below,)


click for larger view

then Stockfish 8 indicates White wins with a long mating attack after 26...Nxa1? 27.Nd4+ Kc7 28.Nb5+! Kc6 29.Nxa7+ Kc7 30.Nb5+ Kc6 31.Nd4+ Kc7 32.Nxe6+ fxe6 33.Qb4! Qc6 34.Rh7+ Kb8 35.Bxb6 Nb3 36.a5! Nxa5 37.Rh8+ Bc8 38.Qxa5 Qb7 39.Bd4 Qb2+ 40.Kf3 Kb7 41.Qa7+ Kc6 42.Rxc8+ Kb5 43.Qb6+ Ka4 44.Ra8#.

Aug-12-17
Premium Chessgames Member
  takchess: Nxn check then nXr check ?
Aug-12-17  malt: Saw 25.Be3 N;c2+ 26.Kf2
The White knight looks a bigger threat

25.Be3 N:e2 26.K:e2 d4 27.Rd1 Ba6+ 28.Kf3 d3 (28...Qd5+ 29.Kg3)

Aug-12-17  RandomVisitor: If instead of 23...Kc6? black tried 23...Rxe2+ 24.Kd1 Qd8 25.Qxf7+ Qe7 26.Qxe7+ Rxe7 27.Rxe7+ Kxe7 he would have two pawns for the exchange and perhaps a playable game:


click for larger view

Stockfish_17081107_x64_modern: <20 minutes computer time, 8 cores>

<+0.58/41 28.Ra3 Bc6 29.Rxc3 Bxa4> 30.Bb2 Nc6 31.Kc1 d4 32.Rd3 Bb5 33.Rd1 Na5 34.Bxd4 Nc4 35.Rh1 Ke6 36.Bf2 Kd5 37.Rh7 a5 38.Rh6 Ke4 39.Bxb6 Kxf4 40.Bd8 a4 41.Rh4+ Ke5 42.c3 Ke6 43.Bc7 Ne3 44.Bb6 Nc4 45.Bd8 Ne5 46.Bc7 Nc4 47.Rd4 Ne3 48.Rd6+ Ke7 49.Rh6 Nc4 50.Kb1 Kf7 51.Bf4

+0.32/41 28.Ba3+ Kd7 29.Bb4 Ne6 30.Bxc3 d4 31.Bd2 a5 32.c3 dxc3 33.Be3 Be4 34.Ra3 Nc5 35.Bxc5 c2+ 36.Kc1 bxc5 37.Rh3 Kd6 38.Rh6+ Kc7 39.Kd2 Kb7 40.Rf6 Kc7 41.Kc1 Kb7 42.Rf8 Kc7 43.Re8 Kd6 44.Rd8+ Kc7 45.Rg8 Kd6 46.Rg6+ Kc7 47.Rh6 Kb7 48.Rf6 Kc7 49.Re6 Kb7 50.Re5 Kc6 51.Re7 Kb6 52.Kd2 Kc6

Aug-12-17
Premium Chessgames Member
  watwinc: <ChessHigherCat> If 31 Qh1+ why not simply 31 ... Qe4
Aug-12-17  ChessHigherCat: <watwinc: <ChessHigherCat> If 31 Qh1+ why not simply 31 ... Qe4>

Aha, I must have been tired, too :-) Qe4 is a great move because after Qxe4, fxe4 prevents Rd3

Aug-12-17  ChessHigherCat: <patzer2: Stockfish 8 indicates White wins with a long mating attack after 26...Nxa1? 27.Nd4+ Kc7 28.Nb5+! Kc6 29.Nxa7+ Kc7 30.Nb5+ Kc6...>

That's exactly as far as I got in my analysis above, but I settled for the perpetual. I never would have thought of the rest (at least not within 20 minutes, which is the most time I ever indulge in any of these puzzles)

Aug-12-17  morfishine: <patzer2> Black improves with <25...Nxe2> a move that everyone seems to have overlooked, perhaps for its drabness:


click for larger view

But Black threatens 26...Nxf4 nabbing another pawn, and if 26.Kxe2 Black answers 26...Ba6+ activating his buried Bishop

*****

Aug-12-17
Premium Chessgames Member
  patzer2: <morfishine> At 29 depth, Stockfish 8 rates 25...Nxc2 as slightly better than 25...Nxe2:

( [Stockfish 8 64] 29:+2.64 25...Nxc2+ 26.Kf2 Qc8 27.Qxc8+ Bxc8 28.Rxe6+ fxe6 29.Rc1 Nb4 30.Rxc3+ Kb7 31.Bd4 Bd7 32.Be5 Na6 33.Rh3 Nc5 34.Rh7 Kc8 35.Nc3 Ne4+ 36.Nxe4 dxe4 37.Ke3 a6 38.Bd4 b5 39.axb5 axb5 40.Bc3 Kc7 41.Rg7 Kd8 42.Kd4 Ke8)

( [Stockfish 8 64] 29:+3.01 25...Nxe2 26.Kxe2 d4 27.Rd1 Ba6+ 28.Kf3 d3 29.Rxe6+ Qxe6 30.Qg7 dxc2 31.Qxc3+ Qc4 32.Rd3 Kb7 33.Rd7+ Kc6 34.Qxc4+ Bxc4 35.Rxa7 b5 36.axb5+ Kxb5 37.Rc7 Kb4 38.Bd2+ Kb3 39.Rb7+ Ka2 40.Rb8 Bd5+ 41.Ke2 Be4 42.Ke3 f6 43.Rb6 Ka3 44.Rxf6 Kb2)

However, the difference appears trivial. White is winning easily at the end of the analysis of each of these lines. Other than a different set of tactics required by White in response to either 25...Nxe2 or 25...Nxc2+, both moves appear to put up about equal resistance.

Aug-12-17
Premium Chessgames Member
  agb2002: White has a rook for three pawns.

Black threatens Nxc2+ and Nxe2.

White has Kd1, Kf1, Be3, Qg7 and Qh8.

The idea of Qg7(h8) is 25... Nxc2+ 26.Kd1 Nxa1 27.Qxc3+ Kd6 28.Ba3#. However, Black can play 25... Nxe2, also after Kd(f)1.

The idea of Be3 is 25... Nxc2+ 26.Kf2 Nxa1 27.Nd4+, but Black can play 26... Nxe2 27.Kxe2 d4.

I don't know and don't have time for more.

Aug-12-17  morfishine: <patzer2> Actually it doesn't matter, Black has no way of recovering the piece: I had a problem adding lol

*****

Aug-12-17  JustWoodshifting: <Patzer2>:

After 25.Be3--Nxc2+---26.K-f2

I would have definitely gone greedy and taken the Rook on A1.

Instead, SF-8 plays 26.--Qc8 and Chessmaster XI plays 26.--Kc7.

Karl

Aug-13-17  The Kings Domain: Nice puzzle and good game, good attacking play by white, very 19th-Century.
Aug-13-17  TeaChess: Got the idea but don't like black move 26. … d4 . Should have played Kc7 and that's complicated.
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