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Efim Bogoljubov vs Carl Ahues
San Remo (1930), San Remo ITA, rd 13, Feb-01
Queen's Gambit Declined: Barmen Variation (D37)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
Jul-12-06  Rama: This is a titanic struggle.

With 6. cxd5 exd5, black has solved the problem of the QB, characteristic of the QGD. 8. ... Ne4, is very canny and serves to restrict the whole white army.

12. ... Rf6 initiates a K-side attack which gets serious with 16. ... Qh5. It is very dangerous for white to take the knight with 18. fxe4 fxe4, as this increases the pressure on h3 and leads to a breakthrough.

Not taking didn't really help, though, since after 18. Ne2 f4!, there is h3 again. This forces the blocking move 19. g4 ..., but the sack 19. ... Nxg4, breaks through anyway.

The counter-sack 21. Nxf4 gxf4, leads to the critical position. White's 22. Bxe4 loses the queen directly but is there anything better?

After 27. Bxc2 ..., we reach an ending with B+R+R vs Q+R which is won for black with his pawn-plus. However there are quite a few obstacles still to be overcome.

With 34. Rxc6+ bxc6, 35. Rxd8 Qxf4, black finally has stabilized the situation and can go about winning!

With the brilliant 48. ... Qd3!, black shuts out the white rook with a queen offer that cannot be accepted. After 54. ... Qb3+, 55. Kb1 ..., there is no defense against c3, so white resigns.

In 1930 Bogo was in-between WC matches, while Ahues was German champ. There was a lot of great chess played at San Remo that year.

Mar-13-16  TheFocus: A brilliancy prize, donated by I.S. Turnover of Washington, D.C., was divided between Monticelli and Ahues for the games both won from Bogoljubow - <American Chess Bulletin>, February 1930, pg. 23
Mar-18-22  Brenin: One cannot resist sacrificing on g4, but which piece first? 19 ... Nxg4, threatening Ne3+, is more forcing. Then 20 fxg4 (not hxg4 Qh2 mate) Bxg4, threatening Bxh3+, 21 Nxf4 gxf4 22 Bxe4 (hxg4 Qxg4 mate) Bxh3+ 23 Nxh3 (Kf2 dxe4 looks good for Black) Qxh3+ 24 Kf2 (Kg1 dxe4 25 Qg2+ Rg6 wins the Q) Qg3+ 25 Ke2 Rh2+ winning the Q, with strong material advantage.
Mar-18-22  Brenin: After 26 Kd1 Rxc2 27 Bxc2, surely 27 ... Kh8 is a blunder, allowing White back into the game with 28 Rh1 (and why not 30 Reg1, winning the Q?). If 27 ... Kf7 28 Rxf4+ Ke7 then White has much less counterplay.
Mar-18-22
Premium Chessgames Member
  halito27: It's a nice combo and all, but didn't black misplay it afterward?

After 29 Bxh7, Kg7 seems to me to be a mistake, allowing 30 Reg1 with plenty of play for white, e.g. 30... Qxg1 31 Rxg1+ Kxh7 32 exf4 Re4 33 f5 Rxd4+ 34 Ke2, etc.

I'm not sure black has a win here; e.g., if black tries to get behind the passer with 34 ...Rf4 35 Rg5 keeps the black king on the rim (e.g. 35 ...Kh6 36 Rg6+ Kh4 37 Rg7! aiming for the Q-side).

Instead of playing Kg7, the simple intermezzo 29 Qf3+ (removing the pin on the g-file) before Kg7 preserves the win.

Summary: 29 ...Kg7 is a mistake; 30 Reg1 keeps white in the game. Am I missing something?

Mar-18-22
Premium Chessgames Member
  raymondhow: I sac'd the wrong piece, of course. Friday's have been killing me lately.
Mar-18-22
Premium Chessgames Member
  al wazir: 30. Reg1 looks better than the line white played:

30...Qxg1+ (30...Rxe3 31. Rxg3+ Rxg3 32. Bd3) 31. Rxg1+ Kxh7 32. exf4 Re4 33. Rh1+ Kg6 34. Rg1+ Kf5 35. Rg7 Rxd4+ 36. Kc2 Kxf4 37. Rxb7.

Still losing, but it takes longer.

Mar-18-22
Premium Chessgames Member
  Breunor: 24 .. Qh2 ch was much stronger than Qg3 ch, keeping the king from running to the Queenside. 25 Bg2 Rg6. Now 26 Rg1 fails to f3. (27 kxf3? Qh5 and mate in 4).
Mar-18-22
Premium Chessgames Member
  erniecohen: <al wazir> Stockfish says it's even after 30. ♖eg1 ♕xg1+ 31. ♖xg1+ ♔xh7 32. exf4 ♖e4 33. f5 ♖xe4+ 34. ♔e2 ♖f4 35. ♖g5. But Black can interpose 29... ♕f3+ to eliminate the pin.
Mar-18-22  mel gibson: I saw that line after about 1 minute.

Stockfish 14 says:

19... Nxg4

(19. ..Nxg4 (♘f6xg4 ♘e2xf4 g5xf4 f3xg4 ♗c8xg4 ♗d3xe4 ♗g4xh3+ ♔g2-f2 d5xe4 ♕c2xe4 ♗h3xf1 ♔f2xf1 ♖a8-f8 ♘g1-f3 f4xe3 ♖e1xe3 ♕h5-h2 ♖e3-e2 ♕h2-h1+ ♔f1-f2 ♖h6-h2+ ♔f2-e3 ♕h1-c1+ ♔e3-d3 ♕c1-b1+ ♔d3-c4 ♕b1xe4 ♖e2xe4 ♖f8xf3 ♖e4-g4+ ♔g8-f7 d4-d5 ♖h2-c2+ ♔c4-d4 ♖c2xb2 ♖g4-g1 ♖b2-b4+ ♔d4-c5 ♖b4-b5+ ♔c5-d6 ♖b5xd5+ ♔d6-c7 ♖d5-b5 ♖g1-h1 ♔f7-g6 ♔c7-b8 a7-a6 ♖h1-g1+ ♖b5-g5 ♖g1-d1 ♖f3-f7 ♖d1-d2 h7-h5 ♔b8-a7 ♖g5-b5 ♖d2-g2+ ♔g6-h7 ♔a7-a8 ♔h7-h6 ♔a8-b8 a6-a5 ♖g2-g3 ♖f7-f4 ♔b8-c7) +10.45/40 589)

score for Black +10.45 depth 40.

Stockfish 14.1 version avx 2 says:

19... Nxg4

(19. ..Nxg4 (♘f6xg4 ♘e2xf4 g5xf4 f3xe4 ♘g4xe3+ ♖e1xe3 f4xe3 ♖f1-f3 ♖h6-g6+ ♖f3-g3 ♖g6xg3+ ♔g2xg3 ♗c8-e6 ♕c2-e2 ♕h5-g5+ ♔g3-h2 ♖a8-f8 ♕e2-g2) +10.37/54 834)

score for Black +10.37 depth 54.

Mar-18-22  stacase: Once you decide to take with the Knight instead of the Bishop (19...Nxg4) it pretty much plays itself for the next seven moves until 27... then as one of those little sayings when you post says, [The hardest game to play is the "won game."]

Fairly easy for a Friday (-:

Mar-18-22
Premium Chessgames Member
  drollere: black has white pushed into a corner. the opportunity seems to be 19. .. Nxg4, 20. hxg4 Bxg4, 21. fxg4 Qxg4+, 22. Ng3 Qxg3#. i didn't look for countering moves by white. <Brenin> has 25. Ke2 Rh2+, assuming 26. Kd1 Rxc2, but then ... 27. Rg1?
Mar-18-22  Autoreparaturwerkbau: <al wazir 30.Reg1 looks better than the line white played 30...Qxg1+. Still losing, but it takes longer.>

That move actually isn't 'still losing', but completely equals the game. Should have Bogo indeed played 30.Reg1!


click for larger view

he would enter into a completely drawn position (analysis of move 30.?) R+4p vs. R+4p


click for larger view

but he missed it.

With another words, huge advantage that Carl got with 'finding solution to the Friday puzzle' 19...Nxg4, after that still is not an easy task to convert into W.

Mar-18-22
Premium Chessgames Member
  agb2002: White threatens gxh5 and fxe4.

The convergence of the bishop, queen and rook on h3 suggests 19... Nxg4:

A) 20.fxe4 Nxe3+ and 21... Nxc2 wins decisive material.

B) 20.hxg4 Qh2#.

C) 20.fxg4 Bxg4

C.1) 21.hxg4 Qxg4+ 22.Ng3 Qxg3#.

C.2) 21.Bxe4 Bxh3+

C.2.a) 22.Nxh3 Qxh3+ 23.Kf2 (23.Kg1 Qh2#) 23... fxe3+ 24.Kg1 Qh2#.

C.2.b) 22.Kf2 Qh4+ 23.Ng3 (23.Kf3 Bg4+ 24.Kg2 Qh2#) 23... Qxg3+ 24.Ke2 Bxf1+ and 25... dxe4 wins decisive material.

C.3) 21.Nxf4 gxf4

C.3.a) 22.hxg4 Qxg4#.

C.3.b) 22.Bxe4 Bxh3+

C.3.b.i) 23.Nxh3 Qxh3+ 24.Kf2 (24.Kg1 dxe4 with the double threat Rg6+ and Qh1+) 24... Qg3+ 25.Ke2 Rh2+ wins decisive material.

C.3.b.ii) 23.Kf2 Qh4+ as in C.2.b.

C.3.c) 22.exf4 Bxh3+ 23.Nxh3 Qxh3+ 24.Kg1 Qh1#.

C.4) 21.exf4 Bxh3+ as in C.3.c.

Mar-18-22
Premium Chessgames Member
  parch: 19...N:g4 looks stronger than ...B:g4
20.fg4 B:g4 Looked at

(21.B:e4 B:h3+ 22.Kf2 Qh4+ 23.Ng3 Q:g3+ 24.Ke2 B:f1+ 25.K:f1 de4 )

21.N:f4 gf4

(22.Be2 B:h3+ 23.Kh2 Bg4+ 24.Nh3 Q:h3+ 25.Kh1 Qg3# )

22.B:e4 would lead to ...B:h3+ 23.N:h3 Q:h3+
24.Kf2 Qg3+ 25.Kf2 Qg3+ 26.Ke2 Rh2+

Mar-18-22  Refused: < halito27: It's a nice combo and all, but didn't black misplay it afterward? After 29 Bxh7, Kg7 seems to me to be a mistake, allowing 30 Reg1 with plenty of play for white, e.g. 30... Qxg1 31 Rxg1+ Kxh7 32 exf4 Re4 33 f5 Rxd4+ 34 Ke2, etc.

I'm not sure black has a win here; e.g., if black tries to get behind the passer with 34 ...Rf4 35 Rg5 keeps the black king on the rim (e.g. 35 ...Kh6 36 Rg6+ Kh4 37 Rg7! aiming for the Q-side).

Instead of playing Kg7, the simple intermezzo 29 Qf3+ (removing the pin on the g-file) before Kg7 preserves the win.

Summary: 29 ...Kg7 is a mistake; 30 Reg1 keeps white in the game. Am I missing something?>

The white pawns are just way too weak for white to have any hope of holding this. 30.Reg1 Qxg1+ 31.Rxg1+ Kxh7 32.exf4 Re4
Loose pawns drop off and this is just resignable

Mar-18-22
Premium Chessgames Member
  halito27: <Refused> Did you see the rest of my line? I don't think it's resignable at all; looks to me like white holds after 33 f5 & the other moves mentioned above.
Mar-18-22  King.Arthur.Brazil: Maybe the King (don't you know me?) already saw this game before, however I still play 19...♘xg4 and tick the clock! White is in very bad shape.
Mar-18-22  King.Arthur.Brazil: Let me say one more thing, maybe the hardest part is not the ♘ sacrifice but some clever moves like 27...♖h8, 28...♖e8! (If 29. ♖eg1? ♕f3+ 30. ♔c1 ♕xe3+ 31. ♔b1 ♖e7), 29.♔g7! (The reason of 27th move, if White recovers the ♕ with 30. ♖eg1 ♕xg1+ 31. ♖xg1+ ♔xh7 32. exf4 ♖e4 Black still has a winning end-game). The following part is also very instructive and maybe this game already have tens of analysis.

In the case of <halito27>9...♕f3+ 30. ♔c1 ♔g7 31. ♖eg1+ ♔f6 32. ♖h6+ ♔e7 33. ♖g7+ ♔d8 34. e4 where the idea is to block column 'e' (otherwise White lose the ♖ by a ♗), while there are two threats following: 1) ♗f5 and ♖d6# and 2) ♖d6+ and ♖6d7 with possible perpetual check.

In the line of <halito27><refused>, 30. ♖eg1 ♕xg1+ 31. ♖xg1+ ♔xh7 32. exf4 ♖e4 33. f5 ♖xd4+ 34. ♔e2 ♖f4 35. ♖g5 Black can block White advance of the ♙ and repeat the same strategy, doing one move at each time ('cycle'), where all his ♙ structure moves while White becomes paralyzed: 35...c5 36. ♔e3 ♖e4+ 37. ♔f2 ♖e5 38. ♔f3 b5 39. ♔f4 ♖e4+ 40. ♔f3 ♖e1 41. ♔f2 ♖e5 42. ♔f3 c4 43. ♖h5+ ♔g7 44. ♔f4 ♖e4+ 45. ♔g5 ♖e5 46. ♔f4 ♖e1 47. ♖g5+ ♔f7... and so on.

Mar-18-22  TheaN: Saw that taking twice on g3 with the Knight first was quite problematic for White. Knight first, as after <19....Nxg4!> Black has yet to put material into the attack, and Nxe3+ is a problem. After <20.fxg3 Bxg3> Black <is> material-in, but the threat Bxh3+ cannot be coped with.

Instead, 19....Bxg4? 20.fxg3 Nxg3 and now Black has already invested, 21.Rf3= holds, but 21.Nc3 ± actually puts White ahead.

Black did mess up after Kf2. 24....Qh2+ -+ is a slam-dunk win. It's somewhat common after a combination's initiation that someone loosens up. I get it here, as 25.Bg2 (Kf3 Rh3+ #7) Rg6! 26.Rg1 f3 forcing Qxg6 with a much better version of Q:R+B is not as easy to see.

Mar-18-22
Premium Chessgames Member
  halito27: <King.Arthur.Brazil> Thanks for responding: I like the basic idea for black, but white has some tactics.

In your line, after 35...c5 36 f6! is stronger than your Ke2, threatening both Rg7+ and Rxd5.

If we exchange white's f-pawn for black's d-pawn, black has a simple 3-to-2 pawn majority on the Q-side with his king out of play. Shouldn't be too difficult for white to hold.

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