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Art Marthinsen vs Arnold Denker
93rd US Open (1992), Dearborn, MI USA, rd 3, Aug-04
King's Indian Defense: Saemisch. Orthodox Variation (E85)  ·  1-0

ANALYSIS [x]

FEN COPIED

Annotations by Stockfish (Computer).      [23014 more games annotated by Stockfish]

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Kibitzer's Corner
Jun-07-20
Premium Chessgames Member
  Predrag3141: I expected 25 Bf5, but after missing the point of 25 Rxg6 I spotted 28 Qxd6. I also spotted an improvement on White's actual play here:


click for larger view

30 Bh6 improves on 30 Nxe5, which was played. Stockfish evaluates 30 Bh6 as +2.80, 0.32 more than 30 Nxe5.

Just as important, it's easier for a human to see through the thicket of variations. After 30 Bh6, Black has no useful rook moves that make 31 Nxe5 unpalatable, and Black can't answer the delayed Nxe5 with … Kg7, so the knight will be a strong attacking piece.

Stockfish actually recommends sacrificing back a whole rook with 30 Bh6 Kh7 31 Bxf8 Rxf8 32.d6 Bxd6 33.Rxh4+.

Jun-07-20
Premium Chessgames Member
  al wazir: 28. Qxd6! is a beautiful move, but I'm not sure it's winning.

28...Qxd6 29. Rxh4+ Bh6 30. Bxh6 Rf1+ (30... Qe7 31. Bg5+ Qh7 32. Rxh7+ Kxh7) 31. Nc1 Qc7 32. Bf8+ Qh7 33. Rxh7+ Kxh7.

I've never heard of this Marthinsen. Beating Denker was an achievement.

Jun-07-20
Premium Chessgames Member
  Phony Benoni: <al-wazir> Just for the record, Marthiesen was a 2100+-player from California. This was not a good round for veteran GMs at Dearborn: C Eagle vs Bisguier, 1992
Jun-07-20
Premium Chessgames Member
  An Englishman: Good Evening: 4/7 for the week, one better than last, and did solve this one. At this rate, will become a GM by July.
Jun-07-20  scormus: < al wazir> yes, 28 Qxd6 is too beautiful to not play, winning or not. It's the move the hero in the movie would play. B might have thought it was winning when he played ... Bf6. FWIW I think W has good chances after your sequence, but a fair amount of work to win from there
Jun-07-20  Brenin: 27 Bc8+ might be stronger than the more obvious Be6+ played, e.g. 27 ... Nh4 28 Qxb7 Qxb7 29 Rxh4+ Kg8 30 Bxb7, with B+N for the sacrificed R, and a much better position.
Jun-07-20  7he5haman: <al wazir> in your line <34.Be7> looks like a clearcut win; the d-pawn is marching and White can crowd out any future Rd1 with Kc2 plus Nb3.
Jun-07-20  morfishine: Very impressive game by white

A work of Art!

Jun-07-20  N0B0DY: Simplicity is the greatest adornment of Art.
Jun-07-20
Premium Chessgames Member
  perfidious: <PB: <al-wazir> Just for the record, (Marthinsen) was a 2100+-player from California....>

We met in the prelims of the 13th US Correspondence championship in 1996 and he was not quite that strong then.

I was White in a King's Gambit and got a favourable ending, then Art overlooked a fairly simple idea and pitched a pawn for nothing, resigning on the spot. Pretty decent guy to correspond with also and he was from Marin County, CA.

Jun-07-20
Premium Chessgames Member
  agb2002: White has the bishop pair for a bishop, a knight and a pawn.

Black is about to reorganize the pieces with Nf3.

The alignment of the king and a knight on the h-file suggests 25.Rxg6 hxg6 26.Rh1 Nf3 (26... Qh4 27.Rxh2 Qg3 28.Qd2 wins decisive material) 27.Be6+ Nh4 28.Qxd6:

A) 28... Qxd6 29.Rxh4+ Bh6 30.Bxh6

A.1) 30... Qd8 31.Bg5+ Kg7 32.Bxd8 Raxd8 33.Nxe5 + - [B+N+P vs r].

A.2) 30... Qxe6 31.Bxf8+ Kg8 32.dxe6 Rxf8 (32... Kxf8 33.Rh8+ and 34.Rxa8) 33.Nxe5 + - [N+P].

B) 28... Qf6 29.Qxe5

B.1) 29... Qxe5 30.Nxe5 Bxe5 (30... Bf6 31.Nxg6+ wins decisive material) 31.Rxh4+ Kg7 32.Bh6+ Kf6 (32... Kh7(8) 33.Bxf8#) 33.Bxf8 Rxf8 34.Rh7 ends up a pawn ahead with opposite color bishops but still rooks on the board.

B.2) 29... Qe7 30.Qg3 Bf6 31.e5 wins decisive material.

B.3) 29... Qd8 30.Qg3 Bf6 31.e5 Be6 32.d6 wins decisive material.

C) 28... Qd8 29.Qxd8 Rfxd8 30.Rxh4+ wins decisive material.

D) 28... Bf6 29.Qxe7 Bxe7 30.Nxe5 Kg7 31.Bd2, with the idea Nd7 and Bc3, looks very good for White in spite of the pawn for the exchange.

Jun-07-20
Premium Chessgames Member
  OhioChessFan: Hard to believe Black could have saved this game with 48...Kg8. 48...Ke8 allowed 2 tempo gaining checks.
Jun-07-20  I Like Fish: https://pixels.com/featured/funny-f...
Jun-07-20
Premium Chessgames Member
  chrisowen: No zen and the Art of g6 ambled it in?
Jun-07-20
Premium Chessgames Member
  chrisowen: Jz Edit Ok?
Jun-07-20  RandomVisitor: As <Brenin> pointed out, 27.Bc8+ might be the best choice after 25.Rxg6 hxg6 26.Rh1 Nf3:


click for larger view

Stockfish_20060616_x64_modern:

<60/102 2:18:30 +4.51 25.Rxg6 hxg6 26.Rh1 Nf3 27.Bc8+> Kg8 28.Be6+ Rf7 29.Rf1 Kh8 30.Bxf7 Qxf7 31.Ka1 Rf8 32.Qxd6 Qe8 33.Be3 Kg8 34.Rh1 Rf6 35.Qc7 Rf7 36.Qc2 b6 37.Bxb6 Ng5 38.Nf2 Rf3 39.Nd1 Nh7 40.Qg2 Rf6 41.Be3 Qb5 42.Nc3 Qd7 43.Rg1 Qc8 44.Na4 g5

Jun-07-20  jes47: Marthinsen's 25. Rg6 is both prettier and somewhat stronger, but there are other ways of winning. My first thought was 25. Rh1 Ng3 and now 26. Bg4 Nd4 27. h5 is also rated by stockfish as a win (though not as elegant). Puzzles should have unique solutions; those on this website often don't.
Jun-07-20  jes47: <perfidious> <al wazir> I played Denker numerous times at the Manhattan Chess Club weekly rapids in the 1970s. At his best I couldn't touch him but he was inconsistent. I was a strong A and I managed to take a few games off him. So it's not that strange for him to lose to Marthinsen.
Jun-07-20  cormier: 14... fe4 better is 14...Nf6 15.Rg1 f4 16.Qg2 Nh5 17.Bf2 Kh8 18.c5 Rg8 19.Be2 ⩲ +0.70 (25 ply) 15. fe4 ⩲ +1.30 (27 ply)
Jun-07-20
Premium Chessgames Member
  thegoodanarchist: I got the first 2 moves. That’s better than nothin!
Jun-07-20  RandomVisitor: After 25.Rxg6 hxg6 26.Rh1 Nf3 27.Bc8+ black can play 27...Nh4


click for larger view

Stockfish_20060616_x64_modern:

<63/100 4:48:48 +4.64 25.Rxg6 hxg6 26.Rh1 Nf3 27.Bc8+ Nh4> 28.Qxb7 Qxb7 29.Rxh4+ Kg8 30.Bxb7 Ra7 31.Bc6 Rf3 32.Kc2 Rg3 33.Bd2 Rf7 34.Rh2 Rff3 35.Nf2 Rf7 36.Nd1 Rg4 37.Re2 Kh7 38.Bb4 Bf8 39.a4 Rgf4 40.Bd2 g5 41.b4 g4 42.b5 axb5 43.axb5 Be7 44.b6 Bd8

Jun-07-20  RandomVisitor: Other solutions:


click for larger view

Stockfish_20060117_x64_modern:

50/72 52:23 +3.55 25.Be6 Nf3 26.Rxg6 hxg6 27.Rh1+ Nh4 28.Qd2 Bf6 29.Ne1 Qh7 30.Nf3 Qh5 31.Qh6+ Qxh6 32.Bxh6 Kh7 33.Bxf8 Rxf8 34.Nxh4 Kg7 35.Nf3 Be7 36.Nd2 Bg5 37.Nc4 Be7 38.Rh2 b5 39.Nd2 Bg5 40.Kc2 Be3 41.Re2 Bc5 42.Rg2 Kh6 43.Kd3 Bb6 44.Bd7 Bc5

50/82 52:23 +3.43 25.Ne1 Qh4 26.Be6 Nf1 27.Qxb7 Ng3 28.Rd3 Nh5 29.Bg4 Rab8 30.Qa7 Nhf4 31.Rdg3 Qe7 32.Qxa6 Rf7 33.Nc2 Qa7 34.Qxa7 Rxa7 35.Bd2 Rc7 36.Nb4 Rcb7 37.a3 Nf8 38.Bd1 h6 39.a4 Nh7 40.a5 Nf6 41.a6 Nxe4 42.axb7 Rxb7 43.Bxf4 Nxg3 44.Bxg3 Rxb4 45.Be1 Rb5

50/98 52:23 +3.02 25.Bg5 Bf6 26.Bh6 Bg7 27.Bxg7+ Kxg7 28.Ne1 Nf3 29.Nxf3 Rxf3 30.Bf5 Rf8 31.Rc1 R8xf5 32.exf5 Rxf5 33.Rc8 Rf8 34.Rc3 Qd7 35.Rgc1 Rf7 36.Rc7 Qxc7 37.Rxc7 Rxc7 38.Qxd6 Rf7 39.Qe6 Rf6 40.Qd7+ Rf7 41.Qc8 Nf8 42.d6 Kf6 43.Qd8+ Kg6 44.Qa8 Kf5

47/83 23:28 +2.55 25.Rh1 Nf3 26.Bg4 a5 27.Qa3 Nd4 28.Rh2 Bf6 29.Rdh1 Nh4 30.Ne1 Rg8 31.Qh3 Rg7 32.Nc2 Nxc2 33.Rxc2 Bg5 34.Be6 Ng6 35.Bxg5 Qxg5 36.Rg2 Qe7 37.Rhg1 Qf6 38.Qa3 Qf8 39.Qe3 Qf4 40.Qe1 Qf3 41.Rg3 Qf8 42.Bf5 Qf6 43.Rh1 Nf8 44.Rxg7 Qxg7

Jun-07-20
Premium Chessgames Member
  Breunor: I agree 28 Qxd6 is beautiful, but Stockfish prefers Qd2, which it scores around 2.35 relative to Qxd6 which is a little over 1.

Next moves are 28 .... Bf6 29 Ne1 Qh7 30 Nf3 Qh5 31 Qh6 ch Qxh6 32 Bxh6 Nxf3 33 Bxf8 Nh4 34 Bxd6

Jun-08-20
Premium Chessgames Member
  al wazir: <7he5haman: <al wazir> in your line <34.Be7> looks like a clearcut win; the d-pawn is marching and White can crowd out any future Rd1 with Kc2 plus Nb3.>

Maybe.

34. Be7 Re8 35. d6 Rff8. Now what?

I think white does win, but it takes a dozen moves or so, e.g.:

36. Bxf8 Rxf8 37. d7 Kg7 38. Nd3 Kf6 39. Nc5 Ke7 40. Bd5 Rb8 41. Bxb7 Rxb7 42. Nxb7 Kxd7 43. Nc5+ Ke7 44. Nd3 Kf6, etc.

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