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Conel Hugh O'Donel Alexander vs Laszlo Szabo
Hilversum Zonal (1947), Hilversum NED, rd 7, Jul-22
Sicilian Defense: Scheveningen. Classical Variation Paulsen Variation (B85)  ·  1-0



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Kibitzer's Corner
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Nov-28-04  maoam: <beenthere240>

On 21...Kh8, I think the immediate 22.Ng5 is even stronger than 22.Qh4.

Nov-28-04  ajit: White's continuation is simple and easier after 21...♔h8 22.♘g5! ♗x♘(or gx♘)ex♗ and mate in 2 after ♕h4!Simply no escape!
Nov-28-04  euripides: Perhaps 21...Kh8 22 Qh4 h6 23 Qe4 g6 (or gxf6 24 exf6 Bxf6 25 Ng5 winning) 24 Qf4 Kg7 25 Bc1 Rh8 26 Ng4 and if 26...g5 27 Qxf7 mate.
Nov-28-04  Chesspatch: <ajit> What if instead of 22.♘g5 x♘, he plays 22. ... h6? The plot thickens, yes?
Nov-28-04  euripides: <ajit> After 22 Ng5 Bxf6 23 exf6 Black can try 23 ...g6 24 Qh4 h5, but 25 g4 then seems to win as there's no clear defence to 25 gxh5.
Nov-28-04  Simon 33: This is a classic example of a bad bishop.
Nov-28-04  patzer2: <JohnBoy> After 26...Rxf6 27. Qg5! h6, White has a mating attack with 28. Bxf6+! (better than my previously recomended 28. Qg6) 28....Qxf6 29. Qxf6+ Kh7 30. Qf7+ Kh8 31. Qf8+ Kh7 32. Rf1 e5 33. Rf7+ Kg6 34. Rg7+ Kh5 35. Qe8+ Kh4 36. g3+ Kh3 37. Qh5#.

Your 26...Rxf6 27. Rf1 might transpose and apparently wins, but as a personal preference I like bringing the heavy artillery up close and personal with 26...Rxf6 27. Qg5!

Nov-28-04  kevin86: Can black's pieces be more out of position? The knight is on mars-the bishop is a great blocker so that the qr will not interfere with black's loss. If the white rook is captured,either the other rook can enter the fray at f1 or the queen can go to g5! Otherwise,double check and mate is next!
Nov-28-04  Calculoso: After 26. ... Rxf6 27. Rf1! is equally as good as Qg5 (and I think it looks better:))
Premium Chessgames Member
  Penguincw: Looks like this puzzle was a Sunday puzzle about 11.5 years ago. Interesting to see how many members are still active today.

Anyway, surprisingly easier than average Sunday puzzle to cap off what has (for me) been an easier than average week. Could it be due to the Daylight Savings Time today?

I got 21.Nf6+ gxf6 22.Qg3+ Kh8 23.exf6, attacking the bishop and threatening mate on g7. 23...Bxf6 is forced, it's defended once, attacked once, I stopped here. Another instance where I'm not sure if I would've gotten it OTB.

I also have no idea what to do if black plays 21...Kh8.

Premium Chessgames Member
  offramp: I got this by reading the previous comments.
Mar-13-16  stst: Looks like seen it before....
Looks also like simple:
21.Nf6+ gxf6
22.exf6 Bxf6
23.Qg3+ ....

24.Ne5 Rg8

24.Nxg5 f6
25.Ne6 dbl+ (by N & Q) Kh8

May miss some tougher defense by Black,... to be resumed tomorrow.... clock advances 1 hr ==> it's almost 11pm in West (2am EST!!)

Mar-13-16  jith1207: If I perfectly got a puzzle from start to end with all the variations considered, Man, that's not an insane puzzle.

Note to Self: Don't get over-excited, it's probably at Friday level on one of the luckiest weeks of my puzzle solving career. Or I might have seen this game before. Darn it, one of that.

Mar-13-16  JimmyRockHound: Way beyond my pay grade but great to see a puzzle from the great C H O'D A. I put it into my silicon pal and 21. Nf6 didn't emerge as the best move until 21 ply.
Mar-13-16  stacase: Another vote for, "Too easy for a Sunday"
Mar-13-16  morfishine: I've seen this before, Yessirree <21. Nf6+> Maybe not same game, but I've seen this before


Mar-13-16  WorstPlayerEver: I must be insane.
Mar-13-16  agb2002: White has a bishop and a knight for the bishop pair.

White can attack the black king with at least five pieces, starting with 21.Nf6+:

A) 21... gxf6 22.Qg3+ Kh8 23.exf6 Bxf6 (23... Rg8 24.fxe7+ and mate in three) 24.Ne5

A.1) 24... Bg7 25.Nxf7+ (a flashy line is 25.Qxg7+ Kxg7 26.Nxf7+ Kg8 27.Nh6# but Black can play 26.. Kg6) 25... Rxf7 (25... Kg8 26.Qxg7#) 26.Rxf7 Bxb2 27.d4 (enabling d3 for the queen with tempo; 27.Raf1 Bd7 28.Rxh7+ Kxh7 29.Rf7+ Kh6 unclear)

A.1.a) 27... Qxd4 28.Rf8#.

A.1.b) 27... Qg8 28.Qe5+ Qg7 29.Qx7#.

A.1.c) 27... Bxd4 28.Qd3 Qh4 (28... Qg8 29.Qxd4+ and mate in two) 29.g3 Qh5 30.Qxd4+ e5 31.Qd8#.

A.2) 24... Nc6 25.Rxf6 Qxf6 26.Nc4 Qxb2 27.Nxb7 + - [Q vs R+B] and a much better position. For example, 27... Nc6 (27... Bd7 28.Qe5+ and 29.Qxa5) 28.Nc4 Bd7 29.Nb6 Rad8 30.Qc7 Bc8 31.Nxc8 Rxc8 32.Qxb7.

A.3) 24... Rg8 25.Nxf7#.

B) 21... Kh8 22.Qe4

B.1) 22... gxf6 23.exf6 Bxf6 (23... Bd6 24.Ng5 wins) 24.Ng5 wins since Qxh7 is unstoppable (24... Bxb2, or 24... Kg7, 25.Qxh7#; 24... Qxd3 25.Qxd3, etc.).

B.2) 22... g6 23.Qf4

B.2.a) 23... Bxf6 24.exf6 looks winning. For example, 24... Rg8 25.Qh6 Qf8 26.Ng5 Qxh6 27.Nxf7#.

B.2.b) 23... Rg8 24.Qh6 Bxf6 25.exf6 and Black is defenseless against Ng5 once more.

Mar-13-16  gofer: I have a very strong sense of <Deja Vu>, but only time will tell whether <CG> have repeated this one recently...

...I love POTD's where white bombards f6 to shut down Pf7, open the g file and make black's castled king (on that side obviously) struggle for room and defenders.

So today is a good day...

<21 Nf6+ ...>

Refusing the sacrifice (or trading bishops) seems a little unwise as we still get to our main aim (of having a pawn or piece on f6), but haven't gained much for it...

21 ... Kh8
22 Qe4 g6
23 Qh4 h5
24 Qg5

22 ... Bxf6
23 exf6 gxf6
24 Qg3+ Kh8
25 Ne5

This transposes to the following, but without the bishop which seems unwise...

<21 ... gxf6>
<22 Qg3+ Kh8>
<23 exf6 Bxf6>
<24 Ne5! ...>

Though I like 24 Ng5, it is obvious that Bb2 is worth its weight in gold. So we need to retain the a1-h8 diagonal by attacking Bf6 with Rf1, but also at the same time threaten Nxf7+ and Ng6+ causing absolute mayhem!!!

I am guessing at this point, but I would suggest that black might resign.

24 ... Rg8?
25 Nxf7#

24 ... Bg7?
25 Rxf7

24 ... Nc6
25 Rxf6 Nxe5 (Qxf6 Nxf7+ Rxf7 Bxf6+ Rxf6 Qe5 )
26 Bxe5 mating

<24 ... Bxe5>
<25 Bxe5+ f6>
<26 Rxf6 Rxf6/Qxf6>
<27 Rf1! > mating

So have I seen this one before?!?!


Hmmm, I haven't seen it before, so maybe it was just easy...

Mar-13-16  alphee: I agree with Penguincw, this puzzle seems a bit too easy for a sunday and the proof is that I got it up to move 24 where I had doubts... Still a very effective way to attack the king in its castel.
Mar-13-16  NeoIndian: Am I the only one who kept reading his name as "colonel" ?
Mar-13-16  patzer2: Didn't remember seeing this one from over 11 years ago. However, I guessed it was a demolition sacrifice with 21. Nf6+!! and got as far in my mental calculations as 21...gxf6 22. Qg3+ Kh8 23. exf6 Bxf6 (diagram below):

click for larger view

Here (diagram above) I was stumped, and did not recall the essential and only winning follow-up 24. Ne5! (diagram below):

click for larger view

According to the computers, this brilliant follow-up (24. Ne5!, diagram above) is the only winning move. Except for the weak alternative 24. Ng5 = (-0.14 @ 21 depth, Deep Fritz 15), all the other alternatives lose for White.

The tactics which follow from 21. Nf6+!! and 24. Ne5! are instructive and entertaining, but to most of us at less than master and expert strength they are not so easy or obvious.

So here's some analysis with Deep Fritz 15 x 64 to help break them down:

<21. ♘f6+ !! gxf6 22. ♕g3+ ♔h8 23. exf6 ♗xf6 24. ♘e5! ♗xe5>

If Black makes a non-committal move like 24... b6, then 25. Rxf6! Qxf6 26. Nxf7+ Rxf7 27. Bxf6+ Rxf6 28. Qe5 Kg7 29. Rf1 with mate soon to follow (#8, Deep Fritz 15).

If 24... Rg8, then 25. Nxf7#.

If 24... Bg7, then 25. Rxf7! Bf6 (25... Rg8 26. Ng6+ hxg6 27. Qh3+ Qh4 28. Qxh4#) 26. Rf1! Rg8 27. Qh4 Rg7 28. Ng6+ Kg8 29. Qxf6 Qxf6 30. Rf8+ Qxf8 Rxf8#.

If 24... Bd7 (Black's strongest defense), then 25. Rf3! when play might continue 25...Nc6 26. Nxc6 Bxb2 27. Nxd8 Raxd8 28. Qh4 Bg7 29. Rxf7 Rxf7 30. Qxd8+ Rf8 31. Qe7 Bc6 32. Rc1 Bd5 33. Qd7 Bc6 34. Qxe6 Rd8 35. Rxc6 bxc6 36. Qxc6 Rf8 37. g4 (+6.03 @ 18 depth, Deep Fritz 15).

<25. ♗xe5+ f6 26. ♖xf6> 1-0 Black resigns in lieu of mate-in-seven after 26...Rxf6 27. Rf1 Nc6 28. Bxf6+ Qxf6 29. Rxf6 Bd7 30. Rf7 Rg8 31. Qh4 Rg7 32. Qf6 Be8 33. Qxg7#.

P.S.: For a Black improvement, instead of the awkward looking <15...♗f6> perhaps the Stockfish 5 SE suggestion with the simple maneuver 15...Nc6 = to (0.25 @ 20 depth) might be worth a try.

Play in this line might go 15... Nc6 16. Nxc6 Qxc6 17. Rd1 b5 18. Qg3 f6 19. e5 Nc5 20. exd6 Bxd6 21. Be2 Rb8 22. a3 Bb7 23. Bf3 Qc7 24. b4 Bxf3 25. Qxf3 Nb7 26. Rde1 Qf7 27. Qc6 Ra8 28. Rf3 Rfd8 29. Kg1 Rdc8 30. Qb6 Rc4 = (0.10 @ 21 depth, Deep Fritz 15).

Mar-13-16  Eduardo Leon: Knowing that this is a puzzle, there can be no other choice but:

<21.♘f6+ gxf6 22.♕g3+ ♔h8 23.exf6 ♗xf6 24.♘e5>

click for larger view

Threatening 25.♖xf6 ♕xf6 26.♘c4. And now:

<24...♗g7 25.♖xf7 ♖g8>

Or 25...♖xf7 26.♘xf7+ ♔g8 27.♕xg7#.

<26.♘g6+ hxg6 27.♕h3+>

click for larger view


<24...♗xe5 25.♗xe5+ f6 26.♖xf6 ♖xf6 27.♖f1>

click for larger view


<24...♘c6 25.♘xc6 ♗xb2 26.♘xd8 ♗xa1 27.♘xf7+ ♖xf7 28.♖xf7>

click for larger view

Mar-13-16  Eduardo Leon: <patzer2> Nice analysis! I missed some of those lines.
Mar-13-16  RandomVisitor: After 24...Bd7, which might hold out longer:

click for larger view


<+5.19/33 25.Rf3 Nc6 26.Raf1> Bxe5 27.Bxe5+ Nxe5 28.Qxe5+ f6 29.Rxf6 Rxf6 30.Rxf6 Qxf6 31.Qxf6+ Kg8 32.h3 Rf8 33.Qg5+ Kf7 34.Qh5+ Ke7 35.Qxh7+ Kd6 36.Qe4 a5 37.Qd4+ Ke7 38.Qc5+ Ke8 39.Qh5+ Rf7 40.Qxa5 Bc6 41.Kg1 Bd5 42.Qc3 Rf8 43.Qg7 Rf7 44.Qe5 Rf5 45.Qg3 Kf7 46.h4 Kf8 47.Qc7 Rf7 48.Qe5 Rg7 49.Qb8+ Kf7 50.g3 Rg4 51.Qe5

+5.00/33 25.Rae1 Rc8 26.Rf3 Rc2 27.Rxf6 Qxf6 28.Qf4 Kg7 29.Qg4+ Kh8 30.Qb4 Rcc8 31.Qd2 Qg7 32.Nxd7 e5 33.Nxf8 Nc6 34.Nd7 f6 35.Nc5 a5 36.Ne4 Rf8 37.Ba3 Rd8 38.Re3 Qh6 39.Qf2 f5 40.Nd6 Rxd6 41.Bxd6 Qxd6 42.Qxf5 Qd8 43.Qf7 Qg5 44.Qf8+ Qg8 45.Qf6+ Qg7 46.Qf5 Qe7 47.Qc8+ Nd8 48.Qb8 Kg7 49.Rxe5 Qf7 50.Re1 Nc6

+4.85/33 25.h3 Nc6 26.Nxc6 Bxb2 27.Nxd8 Raxd8 28.d4 f6 29.Rxf6 Bxd4 30.Rxf8+ Rxf8 31.Qd6 Bg7 32.Re1 Bc6 33.Rxe6 Rg8 34.Re2 Ba1 35.Kh2 Bg7 36.Qe7 Bd4 37.g3 Re8 38.Qxe8+ Bxe8 39.Rxe8+ Kg7 40.Re7+ Kg6 41.Rxb7 a5 42.Rd7 Bc3 43.Rd6+ Kg5 44.Rd3 Bb4 45.Kg2 Kg6 46.Rd5 h6 47.Kf3 Kf6 48.Ke4 Bc3 49.Rc5 Bb4

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