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Ludek Pachman vs Jan Hein Donner
NED-CSR (1955), Rotterdam NED, rd 2, Dec-18
English Opening: Great Snake Variation (A10)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
May-22-05
Premium Chessgames Member
  cu8sfan: This game is very interesting. I found it in Ludek Pachman 's <Modern Chess Strategy>, a great book which I value more than Aron Nimzowitsch 's <My System>. The content of these two books is about the same but the explanations in Pachman's book are much clearer for a patzer like me.

About this game Pachman writes "White attacks the enemy centre by piece pressure combined with pawn pressure from the sides; he finally destroys it by advancing his Queen-pawn, which had been held back in reserve." I really think this game deserves some attention.

Jul-05-05
Premium Chessgames Member
  Mating Net: I agree <cu8sfan> this game does deserve attention. I think the exchange sacrifice 26.Rxg7! is quite clever. It allows the followup 27.Re8 which essentially freezes 3 Black pieces on the back rank. White wins by exploiting the resulting pin.
Nov-09-09  WhiteRook48: 32...Kf7 33 Nd5! fxg3+ 34 Bxg3 Rg8 35 Qf6+ Ke8 36 Nc7+ Kd7 37 Qd6#
Dec-21-16  zydeco: <WhiteRook48> Pretty line. But 32...Kf7 33.Qe7+ wins a rook.

Pachman was masterful with both the Closed Sicilian and the English. I'd never noticed before this game that the openings have a lot in common. White pushes the f-pawn early, concedes some ground in the center (usually the d4 square), and slowly develops a kingside attack in front of his own king.

Nov-29-19  devere: Since 25.Re7 is obvious and 25...Qxc4? isn't forced, this would be a better problem on White's 26th move.
Nov-29-19  Walter Glattke: Hanging rook on a8 Always decides to white advantage with decisive material.
Nov-29-19
Premium Chessgames Member
  An Englishman: Good Evening: Solved the puzzle, but the interesting moment consists of 13.f4, because Black could have replied 13...exf4 and 14.Nxf4 allows 14...Nxg3. 14.gxf4 seems forced, unless White has some trickery after 13.f4,exf4; 14.Nxf4,Nxg3; 15.Rf3,Qh4; 16.Bf2.
Nov-29-19
Premium Chessgames Member
  Dionysius1: Good Morning <An Englishman>. Isn't your 16.Bf2 the end of the line for Black - a N for a pawn down without compensation?
Nov-29-19  Carrots and Pizza: Is this a correct puzzle? Correct me please if I'm wrong, but this doesn't seem like a true tactical puzzle.
Nov-29-19  TheaN: I <do> think this Friday is supposed to start at move 25, as White can play 25.Re7! ± at virtue of 25....Qxc4?! (Qg6 ± holds for now but Black isn't exactly doing great), 26.Rxg7 +-. I didn't calculate it entirely, but was confident we could sac c4 due to the first three moves of the game line. I'd say 26.Rxg7! +- is more Wednesday/Thursday level being a few less ply deep.
Nov-29-19  Olavi: Great Snake Variation? Good grief.
Nov-29-19
Premium Chessgames Member
  agb2002: Black threatens Bxe6 and Nxe6.

The first idea that comes to mind is 25.Re7 followed by Rxg7. It seems to work after 25... Qxc4 26.Rxg7 Rxg7 27.Re8 or 26... Kxg7 27.Re7+. However, I haven't found anything decisive after 25... Qg6.

In any case I'd play 25.Re7.

Nov-29-19  RandomVisitor: 17...e4! would likely equalize for black


click for larger view

Stockfish_19111923_x64_modern:

<34/46 03:49 +0.13 18.Nxe4 fxe4 19.g4 Nhf6 20.f5 Qf7> 21.Nf4 Nb6 22.b3 Bd7 23.Qh4 Kg8 24.g5 Bxf5 25.gxf6 Qxf6 26.Qg3 d5 27.Rf2 Qf7 28.c5 Nc8 29.Rg1 Ne7 30.Bf1 Bg6 31.Nxd5 cxd5 32.Rxf7 Rxf7 33.Qe1 Nf5 34.Qd2 Nxe3 35.Qxe3 Rf3 36.Qd2 e3 37.Qb4 Re8 38.Bg2 Rf2 39.Kg3

34/45 03:49 0.00 18.a4 Ndf6 19.d5 c5 20.Nb5 Ne8 21.b4 b6 22.Qd2 Bd7 23.Rb1 Rg8 24.Bf2 Bf6 25.Rb3 Rg7 26.Rg1 Bd8 27.Rgb1 Bf6

34/49 03:49 -0.32 18.b3 Ndf6 19.d5 c5 20.Rb1 b6 21.Bf2 a5 22.Qd2 Ba6 23.a3 Nd7 24.Qc2 Nhf6 25.Rfe1 Rfe8 26.Nd1 b5 27.Ne3 Reb8 28.Qd2 h5 29.Rg1 b4 30.Ra1 Bb7 31.a4 Rg8 32.Qc2 Ba6 33.Ra2 Rgb8 34.Qd2 Nb6 35.Rb1 Kh7

Nov-29-19  RandomVisitor: 24.Nd5 wins faster for white, which threatens Re7.


click for larger view

Stockfish_19111923_x64_modern:

<36/72 03:26 +5.82 24...cxd5 25.Bxd5 Qf8 26.Qd2 a5 27.Bxg8> Kxg8 28.Re2 Ra6 29.Qd5+ Kh8 30.Rxd7 Bxd7 31.Qxd7 Ra8 32.Qxb7 Re8 33.Rd2 Bf6 34.Qa6 Ra8 35.Qe6 Bg7 36.Qb6 Qe7 37.c5 Bd4 38.Qd6 Qxd6 39.Bxd6 Bf6 40.c6 Kg7 41.Bf4 Kf7 42.c7 Ke6 43.b3 Rc8 44.Rd6+ Ke7 45.Rd5 h6 46.h4 Bc3 47.Rxf5 Ke6 48.Rh5 Kd7 49.Rxh6

36/69 03:26 +8.17 24...a5 25.Re7 Qf8 26.Rxg7 Rxg7 27.Nc7 Rg6 28.Rxg6 hxg6 29.Nxa8 Kg8 30.Nb6 Nf6 31.Qe1 Ne4 32.Bxe4 fxe4 33.Nxc8 Qxc8 34.Qxe4 Kf7 35.g4 b5 36.Be5 Qe6 37.cxb5 cxb5 38.Qb7+ Kf8 39.Qxb5 Qe7 40.a4 Kf7 41.Qd5+ Qe6 42.Qe4 Ke8 43.Kg3 g5 44.Kg2 Kf7 45.Qb7+ Ke8 46.Qb5+ Kf8 47.Kg3 Kf7 48.Qc5 Ke8 49.Qxa5

36/67 03:26 +8.35 24...Nb6 25.Re7 Qf8 26.Rxg7 Rxg7 27.Be5 Nd7 28.Bxg7+ Qxg7 29.Nc7 Rb8 30.Qf4 Kg8 31.Re6 Nf8 32.Re8 Qf6 33.Nd5 cxd5 34.Qxb8 Bd7 35.Qd8 Qxd8 36.Bxd5+ Kg7 37.Rxd8 a5 38.Bxb7 Be6 39.Bd5 Bxd5 40.Rxd5 a4 41.c5 Kf6 42.c6 Ne6 43.Rd7 h5 44.c7 Nxc7 45.Rxc7 a3 46.Rc6+ Kf7 47.bxa3 Kg7 48.a4 h4 49.gxh4 f4 50.Rc7+ Kg6

Nov-29-19
Premium Chessgames Member
  PawnSac: < Carrots and Pizza: Is this a correct puzzle? Correct me please if I'm wrong, but this doesn't seem like a true tactical puzzle. >

no you're not wrong. This was a positional sac puzzle. Strictly speaking, all positions are both tactical and positional, but the point is, the puzzle of the day doesn't have to be a tactical combination to win material.

Nov-29-19  Cheapo by the Dozen: Things really get complicated if Black chooses the ... Kxg7/... Kf6 defense. The engine thinks White has a thumping win, but it includes a number of non-forcing moves slowly tightening the noose.
Nov-30-19
Premium Chessgames Member
  patzer2: As <RV> observes 17...e4 = would have equalized for Black.

However, early in the opening with the ugly 7...Nfd7?, Black's game had already taken a turn for the worse.

After 7...Nfd7? 8. d3 ± (+0.84 @ 31 ply, Stockfish 10), White has an easy and comfortable advantage while Black struggles to finish development.

Instead of moving the Knight twice in the opening and blocking the Bishop and Queenside development, Black does better with normal development via the popular move 7...Nc6 as in Black's win in Ivanchuk vs M Vachier-Lagrave, 2013.

Nov-30-19
Premium Chessgames Member
  patzer2: I wonder if White wasn't playing our recent Friday puzzle position solution 25. Re7! move by move without seeing all the tactics involved.

I found 25. Re7 and would have followed with 26. Rxg7 simply because the even exchange of material after 26...Rxg7 27. Be5 ± trades material for a position in White's favor.

Hopefully, I would have found the better move 27. Re8! +- as Black did in this game.

One reason I think White might have been taking it a move at a time, without seeing all the tactics, is that on the follow-up 30. Qe5 +- (+3.05 @ 28 ply, Stockfish 10), White misses the much stronger 30. gxf4! +- (+11.37 @ 27 ply, Stockfish 10).

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