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Kenneth Wallach vs Allen Kornfeld
Midwest Masters (1982), Chicago, rd 2
Benoni Defense: Fianchetto Variation (A62)  ·  0-1
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Jan-14-14  PJs Studio: 30.Rf1??

30.Rh1 holds longer but in almost all variations white will have to exchange the rook on c4 for the bishop on d4 leading to a dead lost N v R ending...but it sure beats getting mated.

30.Rxd4 may be better than 30. Rh1 I checked both lines and white gets the worst of it ...quick.

Jan-14-14  PJs Studio: I'm a Benoni nut. It's a great line to play against white after he's already committed to g3.
Jan-14-14  goldfarbdj: I look at the king and notice it has no flight squares. I think, "If only the rook on h7 were the queen, I could play Qh3#!" From there it's but a moment to see that the rook can be sacked to bring the queen in with tempo -- a common theme for these puzzles.
Jan-14-14
Premium Chessgames Member
  agb2002: Black has a bishop for a knight.

Black can deliver mate by moving the queen to h3 with tempo: 30... Rh2+ 31.Kxh2 Qh7+ 32.Kg2 Qh3#.

Jan-14-14
Premium Chessgames Member
  offramp: < gawain: Kudos to <Patriot>.

No pattern yet evident for this week's puzzles, is there?>

How about, "Black wins by moving his queen to the third rank."

Jan-14-14  TheaN: Tuesday 14 January 2014

<30....?>

White just condemned his King by blocking f1. Black utilizes a <replace-the-piece> tactic to take control of g2: after <30....Rh2+ 31.Kxh2 Qh7+ 32.Kg2 Qh3# 0-1> the queen covers g2 and white is mated.

More interesting is the discussion how white does defend himself on move 30. The proposed 30.Rh1, to cover the h-file, seems to only encourage black to keep up the pressure. I'd play 30....Rf8 to threaten Rf2+ with mate soon. After 31.Rxh7 Rf2+ 32.Kg1 Qxh7, Qh2# is imminent, so already now, white's only defense seems to be 31.Rxd4. If white has to play Rxd4, he might as well do so on move 30 with a slightly better position.

Take note that black may try a sneaky trap on move 30: 30.Rh1 Qf7!? 31.Qf1? (theoretically logical to counter both pieces on the f- and h-file) Qf3+! 32.Qxf3 gxf3+ with Rxh1 . However, Qf7 seems slightly worse than Rf8 after white exchanges on d4, so might not be the move of choice.

Jan-14-14
Premium Chessgames Member
  morfishine: <30...Rh2+> Forces mate: 31.Kxh2 Qh7+ 32.Kg2 Qh3#
Jan-14-14
Premium Chessgames Member
  FSR: Ditto what the others said. Of course Black is Allen Kornfeld, not "Andreas Kornfeld." I submitted a correction slip. I played in this tournament, drawing all five of my games.
Jan-14-14  zb2cr: Mate in 3 with 30. ... Rh2+; 31.Kxh2, Qh7+; 32. Kg2, Qh3#.
Jan-14-14  Hevelius: 'Tis always good when I get a Tuesday puzzle at first blush. Nice one, indeed... and have a pleasant day everyone.
Jan-14-14  Nick46: As someone on this site once said: "Look for the forcing move."
Jan-14-14  Cheapo by the Dozen: Simple enough.

I haven't seen much Twilight Zone, by the way, but I've long known the story from Science Fiction Hall of Fame. That's an awesome collection, by the way, with last two stories being Flowers For Algernon and A Rose For Ecclesiastes.

Jan-14-14  Cheapo by the Dozen: My initial reaction was also that the natural defense is to sacrifice the exchange at d4, Blacks ability to exchange off a pair of rooks (and leave the other one on an open file) notwithstanding. But the Nb1 followup suggested by Chessmaster shocks me. I'd have thought to maneuver the knight to f4 and perhaps e6, or to leave it in place to defend e4 and discourage Qa4, or migrate it to b6, although that's a bit out of the way, or maneuver it to d3 to support e5.

Undeveloping it entirely would be my last thought, and without firing up the engine I don't see what the point of where it would be heading.

Jan-14-14
Premium Chessgames Member
  Castleinthesky: This is a classic "clearance" and "distraction" puzzle, which involves the sacrifice of a piece so that it is no longer an obstruction and so that the king is forced to a square so that it loses its escape move.
Jan-14-14
Premium Chessgames Member
  kevin86: Coy Boys at chessgames.com;yesterday,I was looking for the mate. AND,it comes today:

30...♖h2+ 31 ♔xh2 ♕h7+ 32 ♔g2 ♕h3#. A beautiful cross-fire mate with queen and bishop.

Jan-14-14  JimNorCal: Simpler than yesterday's puzzle.
Prettier though.
Jan-14-14  YetAnotherAmateur: Really pretty simple: 30. ... Rh2+ 31. Kxh2 (forced) Qh7+ 32. Kg2 (forced) Qh3#

It's to late to prevent this: Had white dropped a rook for the bishop earlier, things might have turned out differently.

Jan-14-14  BOSTER: This is another more complicated pos. where white used the opened Ťať file to win. I'd say this is a variation of Damiano's Mate.


click for larger view

White to play.

Jan-14-14  M.Hassan: <BOSTER: Took me some time but i think I found it.>

1.Ra8+ Kxa8(forced)
2.Qa1+ Kb8
Here is the time that White should not be afraid of Queen sac.

3.Qa7+ Kxa7 (mate otherwise)
4.Nc6++ Ka8 (has to stay on a file)
5.Ra1+
and mate in 2 if 2 Bishops come on the way.
<4.Nc6++> I think is one of the most elegant Knight movement I have seen.

Jan-14-14  BOSTER: < M.Hassan> 4...K a8 or K ...a6. Great.
Jan-14-14
Premium Chessgames Member
  whiteshark: <30... Rh2+>, and that's it.
Jan-14-14
Premium Chessgames Member
  Penguincw: This puzzle is somehow easier than yesterday's.
Jan-14-14  WoodPushkin: Greetings:

30...Rh2+ followed by queen.

Analysis Calculation Execution: Study!!!

Jan-14-14  Patriot: <BOSTER> Very nice problem! And a nice solution by <M.Hassan>.

At first I thought 1.Ra8+ Kxa8 2.Qa1+ Kb8 3.Nc6+:

3...Kc8 4.Qa8#

3...bxc6 4.Qa7+ Kc8 5.Qa8#

3...Qxc6 4.Qa7+ Kc8 5.Qa8+ Kd7, which refutes the whole thing starting with 3.Nc6+.

This is why 3.Qa7+! works and 3.Nc6+ does not.

Jan-14-14  Nullifidian: <Penguincw: This puzzle is somehow easier than yesterday's.>

I agree, probably because there's a direct mate here, rather than just winning material. That's the sort of problem I associate with a Monday, and I look for the checkmate first.

The solution:
30... ♖h2+ 31. ♔xh2 ♕h7+ 32. ♕g2 ♕h3#

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