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Arthur Dunkelblum vs Max Euwe
BEL-NED (1950), Antwerp BEL, rd 1, Apr-15
Catalan Opening: Open Defense. Alekhine Variation (E03)  ·  0-1

ANALYSIS [x]

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sac: 21...Nxf2 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Jul-29-09  JG27Pyth: Looking at this with the computer, (Toga II) 21...Ne3 (which is the move I went for) evaluates quite close to Nxf2, and goes up the exchange earlier. I'm certain I'd prefer it OTB. Both variations evaulate at roughly -2.0 17 ply. Ne3 is the preferred line.*(although the computer initially mildly prefers 21...Nxf2 at move 21, within just three played ply it begins to markedly prefer Ne3 ...the Ne3 variation generates more favorable evaluations: roughly -2.3 to -1.9)

I think Ne3 has to be considered a full second solution. (If you saw that White could defend with Ne4 and were able to calculate that when the smoke cleared Black would be up the exchange.)

Jul-29-09
Premium Chessgames Member
  Jimfromprovidence: I got the game line until move 26 for white and went for 26 e3 instead.


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It loses the exchange but should keep white's queen on the board.

Jul-29-09  YouRang: I notice that I wasn't alone in trying to make <21...Ne3> work.

Unfortunately, I thought I succeeded. :-(

(Actually, checking with the computer, I see that it's not a bad move -- but certainly not best, and it has some of tricks that I neglected.)

Jul-29-09  zanshin: I went with <21...Ne3> and find that I am in good company. However, subsequent Rybka analysis recommends the Knight sac <22.Ne4>


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I'm not quite sure why, but I think it has to do with clearing the 3rd rank for the White Queen.

Jul-29-09
Premium Chessgames Member
  kevin86: Woe is I;I missed the sac at f2 followed by the queen picking off the rook via pin. Brilliant play by Max-to the Max
Jul-29-09
Premium Chessgames Member
  gawain: I saw all the game moves up to and including Qa7+ yet failed to realize that I had actually found the solution. Did not notice that it was a double attack! Woe is me.
Jul-29-09  WhiteRook48: I didn't notice a sac on f2; i wouldn't get it if the solution was staring me in the face
Jul-29-09  lzromeu: I'm in <21...Ne3> team... Rybka's recomend 22Ne4 looks a disaster, because 23Qxe4: threat mate in 2 or take the rook.
Jul-29-09  uaregg: 21... Ne3 is just obvious
Jul-29-09  RoseBuster: Hm, I tried Qa7 which doesn't look very smart now. Looks like I forgot that if I attack a rook with my own rook, the opponent rook is attacking me back, lol. Otherwise it could have been a nice double attack. I need to defeat my own carelessness somehow.
Jul-29-09  JG27Pyth: Zanshin... <I'm not quite sure why, but I think [22.Ne4] has to do with clearing the 3rd rank for the White Queen.>

It's the best answer in light of the threatened Qg2# 22.fxe3 leads to Bxe3+ Bf2 Bxf2+ Kxf2 Qa7+ (22.Nd4 is another possibility, but Ne4 is better... oh and 22.f3 is clearly a catastrophe).

Also: well <phooey> *sigh*... I have to retract my analysis/evaluation of 21...Ne3, although it is a good move my evaluation process with the computer had certain breakdowns in it which made my conclusions a bit *rosier* than was justified. :[

Ne3 technically remains a full second solution IMHO... but as <You Rang> pointed out (prompting me to double check my work) yes, it's tricky, and actually I think (that is, the computer tells me to think) Nxf2 is more straightforward.

Jul-29-09  wanabe2000: <PinnedPiece: No credit for me. I went 21...Ne3>

So did I...

Jul-29-09
Premium Chessgames Member
  sbevan: Well, I got it but White fought as hard as he could!
Jul-29-09
Premium Chessgames Member
  johnlspouge: < <JG27Pyth> wrote: [snip] Ne3 technically remains a full second solution IMHO... but as <You Rang> pointed out [snip] yes, it's tricky >

I am a bit surprised that people have not examined 21...Bxf2+ much, because on superficial evaluation (with & without computer), it looked comparable to 21...Nxf2. It also seems a simple win of material, although the final position is still definitely a mid-game.

Jul-29-09
Premium Chessgames Member
  playground player: I couldn't make Nxf2 work, so I, too, joined the 21...Ne3 contingent. I think White really must take the Knight, and then his King comes under fire from Black's Bishop (22...Bxe3+) and Queen.
Jul-29-09  ruzon: I couldn't make 21...♘e3 work, so I, too, joined the 21...♘xf2 contingent. I know White really must take the Knight, and then his King comes under fire from Black's Bishop {(22...Bxf2+) and Queen.

Then I worked it out as far as 24...e5 and figured I would capture the Rook. I successfully played Guess-the-Move after that.

Jul-29-09  Coigach: <<ruzon>...I worked it out as far as 24...e5...>

My thought process too, except I started with 21..Bxf2. It looks like there could be a forced mate in the starting position, but when that doesn't work the win of an exchange is a good result.

Jul-29-09  sileps: I missed a wednesday. Crap.

I went for 21..Ne3. Good thing I'm in good company though.

Jul-29-09  wals: The following may be of help to those that need help[Event "Antwerpen"] [Site "Antwerpen"]
[Date "1950.??.??"]
[Round "?"]
[White "Arthur Dunkelblum"]
[Black "Max Euwe"]
[Result "0-1"]
[ECO "E03"]
[Annotator "Rybka 3 1-cpu (30m)"]
[PlyCount "64"]

E03: Open Catalan: 5 ♕a4+ ♘bd7 6 ♕xc4 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Qa4+ Nbd7 6. Qxc4 a6 7. Qc2 c5 8. Nf3 b5 9. Ne5 Nd5 10. Nxd7 Qxd7 11. dxc5 Bb7 12. O-O Rc8 13. Qb3 Bxc5 14. Bd2 O-O (14... Nf6 15. Bxb7 $15) 15. Rd1 Qe7 ( 15... Qc7 16. a3 $15) 16. Nc3 White threatens to win material: ♘c3xd5 Nf6 17. Bxb7 Qxb7 18. Be1 Rc7 19. Rd3 Ng4 20. Rad1 Qa8 21. Rd7 Nxf2 Mate threat 22. Bxf2 (22. Bxf2 Bxf2+ Combination) (22. -- Qh1# Mate threat) 22... Bxf2+ 23. Kxf2 Qa7+ 24. R7d4 e5 25. Nd5 Rd7 (25... Rc4 26. Qa3 Ra8 27. Ne7+ Kh8 28. Qf3 exd4 29. Nc6 ) 26. Qe3 exd4 27. Rxd4 Rfd8 28. Ne7+ Kf8 29. Nc6 Qc5 30. Rxd7 Qxe3+ 31. Kxe3 Rxd7 32. Nb4 a5 (32... a5 33. Nc6 Rc7 34. Nxa5 Rc2 ) 0-1

Jul-29-09
Premium Chessgames Member
  OhioChessFan: <---------joins the Ne3 Club
Jul-29-09  muralman: Brother, nothing like having to play half the game for the player. This is an exercise in probabilities. Not my thing.
Jul-29-09  learningchess24: I've been studying the position quite well, but I saw Ne3! would be the best bet leading Black having a strong attack!. If Ne3..(threatening Qg2#) then White has many options to move. If f3 then white has a discovered check on c5.. If 22. fxe3? Bxe3+, 23. Bf2, Bxf2+, 24. Kxf2, Qa7+, 25. R7d4, e5, 26. Nd5, Rd7, 27. Qe3, exd4, 28. Ne7+, Rxe7, 29. Qxd4, and black is a rook ahead with the attack. Now white's chance to move is Nd5 or Ne4. Now let's analyze. Ne5?? is an obvious blunder because Black will simply take the rook plus a pin on the e1 and White should not dare to make a check because the King will just move making a wide open a1-a8 diagonal for the Black's Queen. So, Ne4 would be his best bet for this trick.. Lemme think, Ne4 blocks temporary the wide open a1-a8 diagonal and making his Queen available on the 3rd rank. Black has a counter for this. If ...Qxe4 fxe3, Rxd7 Rxd7,Bxe3+ Bf2,Bxf2 Kxf2,Rc8 leaving Black a great advantage of space and pawn structure. White's pawn at e2 will be doomed sooner or later.
Jul-29-09  mccarthpm: this was easy???
Jul-30-09  SamAtoms1980: At first I thought 21 ... Ne3 was crushing, putting up too many threats for White to deal with. I was darted by 22 Ne4! and White gets out for only a pawn down.
Aug-06-09  LIFE Master AJ: Has anyone had a chnce to look at my notes? (Just checking.)
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