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Adolf Herzog vs Kurt Petschar
AUT-chT (1994), Austria
Queen Pawn Game: Stonewall Attack (D00)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Oct-28-14  TheBish: Black allows a forced mate after 25...Kxc7, but after 25...Kb8 26. Rxb7+ Ka8 (or 26...Kc8 27. Qf5+ Rd7 28. Qxd7#), White wins with 27. Rb6!, when Black can't save the queen without allowing mate with Qxa6. So after 27...Ra2 28. Rxa6+ Qxa6 29. Nxa6 the win is simple.

Also, after 13. Ndc4!, Black can't take the knight or the queen gets trapped: 13...dxc4 14. Bd2 Qb2 15. Nxc4, and now forced is 15...Qxa1 16. Qxa1. <plumbst> already covered what happens after 13...Qxa1 (queen gets trapped after 14. Nd6+ and 15. Qc2).

After 13. Ndc4, best is 13...Ne4, when one possible line is 14. Bb2 (also good is 14. Bd2 Nxd2 15. Rc1 Qb4 16. Nd3 Qe7 17. Nxd2) 14...Qb4 15. Ba3 Qb5 16. Nd6+ Nxd6 17. Bxd6 Nf6 18. a4 Qa6 19. Ba3 Ne4 20. Rc1 Bxe5 21. fxe5 Qb6,


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which Rybka considers roughly equal (Black will soon play Rg8, Kd7 and Rac8).

Oct-28-14  Bubo bubo: Qxa6 would be mate if the king could not escape to b4. Therefore we need a little <vorplan>: 28.b4+! Qxb4 29.Qxa6#
Oct-28-14  zb2cr: White plays the clever 28. b4+, forcing 28. ... Qxb4. Now 29. Qxa6# mates.
Oct-28-14
Premium Chessgames Member
  Penguincw: Darn it! I played 28.Qxa6 one move too soon.
Oct-28-14
Premium Chessgames Member
  Oxspawn: The easiest thing to spot is that black will mate next move so the general strategy for white should be DO SOMETHING QUICK!

The queen can take the a6 pawn but the king escapes via b4 and c3 and the best white can do is to seize a rook or swap queens neither of which saves. However, the white pawn heroically transforms the position.

28. a4+ Qxa4 (forced)
29. Qxa6# (the black queen now blocking the fire escape)

On Monday, a queen sacrifice. Tuesday, a pawn sacrifice. More elegant.

Oct-28-14  JTV: The least you could have done was back the game up by a few moves then say "White to Move." It wasn't even a puzzle because I looked at it and saw the instant checkmate in two moves.


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White to move

Oct-28-14  schweigzwang: Hey man, it's Tuesday.
Oct-28-14
Premium Chessgames Member
  patzer2: <abuzic> Thanks for sharing the improvement 22. Ne6+! Ke8 23. Nc7+!!

Looks like (22. ?) and its follow-up could be a Sunday level puzzle. Many would get 22. Ne6+!, but 22...Ke8 23. Nc7+!! would be extremely difficult to find.

Oct-28-14  notyetagm: A Herzog vs K Petschar, 1994

28 b3-b4+!, a classic <BLOCKING COMBINATION> to take away the only <FLIGHT SQUARE> of the enemy king.

Oct-28-14  Pedro Fernandez: Without any chessboard I didn't see this stupid mate!
Oct-28-14
Premium Chessgames Member
  patzer2: <JTV> You have a point as 27. Qxb7+ leads to mate-in-three, but I suspect chessgames.com thought that was too easy a first move and that 28. b4+ would be slightly more of a challenge for novices on an "easy Tuesday."

It's not unusual for chessgames.com to come back to a game used for a puzzle, and at a later date pick a more difficult position for the daily puzzle.

Some candidates here are (22. ?) for a difficult Saturday or Sunday puzzle, (25. ?) with a neat clearance sacrifice for the first move for a Friday puzzle and (26. ?) with mate-in-five for a Wednesday or Thursday puzzle.

Oct-28-14
Premium Chessgames Member
  kevin86: I can sniff a theme. In both yesterday and today's problems, the loser was forced to block the king's only flight square just before he was mated. 28 b4+ forces the queen to take: ♕xb4 and 29 ♕xa6#
Oct-28-14
Premium Chessgames Member
  Sally Simpson: Superb game. This is why Chess was given to us by the Gods. So we could produce games like this.

As JTV said it couldhave/should have started here. Much more instructive.


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The sequence 25.Qf5+ Kb8 26.Rxb7+ Ka8 27.Ra7+ looks so inviting.


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27...Kxa7 28.Qf7+ leads to the game finish.

But if Black does not take the a7 Rook and instead plays 27...Kb8


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We see the White Queen misplaced on f5 and was infact better on f1 (hitting the a6 pawn and covering the back rank.). The win is getting messy.

Excellent chance Herzog spun that line out in his mind. It's the obvious 1st choce, saw the Rook offer being declined so played the same combo with the Queen on f1.


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If the Rook is declined in the game:

25.Rc7+ Kb8 26.Rxb7+ Ka8 27.Ra7+


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White now has 28.Rxa6.

The final trick in playing a game like this is spotting the pawn sac to cut off a critical flight square. That is that magic moment. (Bravo Kurt Petschar for allowing the mate.). You have scored the winning goal in a cup final, you have pulled the best looking girl in the room, you have pleased the smiling Gods.

(next week the Gods will turn their back on you as you blunder into a 14 move loss.)

Oct-28-14  kyg16: This should be GOTD!!

Great game. FSR you can start to think a pun.

Oct-28-14
Premium Chessgames Member
  TheAlchemist: Simply amazing game.

Pun: Duke of hazard

Oct-28-14  Shams: <FSR you can start to think a pun.>

Or <jfq> might be up to it, given White's surname.

Oct-28-14  psionl0: <Penguincw: Darn it! I played 28.Qxa6 one move too soon.> Yeah, I failed to see the c3 escape square too - nor that Blacks Queen would have blocked it after 28.b4.

Since 25...Kxc7?? leads to a forced mate in 5, would starting this puzzle 2 moves earlier make it a Wednesday problem?

Oct-28-14  Shams: Anyone who complains about the stonewall (and I include myself) should be forced to commit this game to memory.
Oct-28-14  tatarch: What a great game by white.
Oct-28-14  paavoh: So lovely to see a lowly pawn set up a mate in two.
Oct-28-14
Premium Chessgames Member
  Longview: I had to go OTB on this one. I saw the first move 28. b4+ forcing the only move Qxb4 but I could not see the only Mate move in the box until I got it on the board and made the pawn capturing move by Black's Queen. I have difficulty seeing Mates even though I can see the limitations and squares that the King is limited by. Easy after you see it, though.

This is why I play out the games I review where there is resignation. The GM saw something that leads to loosing or more loosing position. I want to see what he/she saw.

Oct-28-14
Premium Chessgames Member
  gawain: Easy, yes, but but very clever! White, having already sacrificed a lot of material, throws in one more pawn to force Black's queen to occupy the escape square b4.
Oct-28-14  M.Hassan: <JTV:because I looked at it and saw the instant checkmate in two moves>

What are the two moves?

Oct-29-14
Premium Chessgames Member
  patzer2: If 25...Kb8, then 26. Rxb7+ Ka8 27. e6 is clearly decisive, as play might continue 27...Re8 (27... Rb8 28. Rxb8+ Kxb8 29. Qf8+ Kc7 30. Qe7+ Kc8 31. Qd7+ Kb8 32. Qb7#) 28. Ra7+ Kb8 (28... Kxa7 29. Qf7+ Kb6 30. Qb7+ Ka5 31. b4+ Qxb4 32. Qxa6#) 29. Qf4+ Kxa7 30. Qc7+ Ka8 31. Qb7#.
Oct-29-14  Dr. J: <TheBish: ... after 25...Kb8 26. Rxb7+ Ka8 27. Rb6!, when Black can't save the queen without allowing mate with Qxa6. So after 27...Ra2 28. Rxa6+ Qxa6 29. Nxa6 the win is simple.>

Same result, but a bit more forcing, and perhaps a bit prettier is the Queen chase 27. Ra7+ Kb8 28. Rxa6 Qb4 29. Ra4 Qb6 30. Rb4 Qxb4 31. Na6+

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