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Karl Forster vs Abraham Kupchik
47th US Open (1946), Pittsburgh, PA USA, rd 3, Jul-09
Sicilian Defense: Najdorf. Opocensky Variation (B92)  ·  0-1



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Premium Chessgames Member
  Phony Benoni: After all these years, I have to admit that 26...c2+ is inferior to 26...Qxf2, after which White is reduced to spite checks and useless interpositions. Ah, well, it was still a nice little blitz of the type not usually associated with Kupchik.
Aug-13-17  morfishine: <Phony Benoni> Right, and the immediate 23...d3 can be met by 24.Qxf6


Premium Chessgames Member
  piltdown man: The first move was easy, anyway.
Aug-13-17  Delboy: Is it already Monday? Easiest Sunday puzzle I have encountered so far. Several other variants also win, e.g. the already mentioned 26. ... Qxf2 and 28. ... Qxa2
Aug-13-17  ChessHigherCat: I had to cheat and use WinBoard and got this, which wins the Queen but I couldn't find a mate:

23...Qxe4 24. Qxe4 d3 25. c3 bxc3 26. b3 c2+ 27. Kc1 Qa1+ 28. Kd2 Bc3+ 29. Kxd3 cxd1=Q+ 30. Rxd1 Qxd1+ 31. Kxc3 Rc8+ 32. Qc4 Rxc4+ 33. bxc4

Premium Chessgames Member
  An Englishman: Good Evening: Flubbed Wednesday, Thursday, and Saturday, solved Friday and Sunday. Typical week.
Aug-13-17  Walter Glattke: I think 27.-Qb2+ 28.Kd2 c1Q++ 29.Kxd3 Qcc3#
Aug-13-17  RandomVisitor: What if white abandoned his Queenside castling misadventure and instead played 12.Bg5 f6 13.Be3 Rb8 and now:

click for larger view

Stockfish_17081107_x64_modern: <1 hour 20 minutes computer time, 8 cores>

+0.89/41 14.h4 Ne7 15.h5 Kf7 16.Nxe7 Kxe7 17.0-0 Qd7 18.Qd2 Rd8 19.b3 Bb7 20.a4 Ke8 21.Rfd1 Bf8 22.axb5 axb5 23.b4 Kf7 24.Ra7 Kg8 25.Rda1 Rdc8 26.R1a6 Ra8 27.Qd3 Rxa7 28.Rxa7 Rc7 29.Bd2 Qf7 30.Qxb5 Bc6 31.Rxc7 Bxb5 32.Rxf7 Kxf7 33.Kh2 Ke6 34.Kh3 Be7 35.g4 gxh5 36.gxh5 f5 37.exf5+ Kxf5

+0.86/41 14.Qd2 Be6 15.0-0 Ne7 16.Nxe7 Qxe7 17.Rfd1 Kf7 18.Qxd6 Qb7 19.a4 Bf8 20.Qd3 Be7 21.axb5 Qxb5 22.b3 Qxd3 23.Rxd3 Rhc8 24.c4 Ra8 25.h4 a5 26.g3 Bb4 27.Bd2 Ke7 28.Kg2 h5 29.Bd1 Rd8 30.Rxd8 Rxd8 31.Bxb4+ axb4 32.Kf1 Rd4 33.Ra7+ Rd7 34.Rxd7+ Kxd7 35.Ke2 Kd6 36.Ke3 Kc5 37.Be2 Bd7 38.Bd3

Aug-13-17  drollere: i got this one; not nearly as difficult as yesterday. the Q captures the R, the p discovers mate; shortly the K is forced out of cover. at resigns, white can't avoid both mate and losing the Q.
Premium Chessgames Member
  agb2002: White threatens Qxf3 and Bd3.

Black can start an attack against the white king with 23... Rxe4 24.Qxe4 d3:

A) 25.c3 bxc3

A.1) 26.b3 c2+ wins decisive material.

A.2) 26.Qxd3 c2+ 27.Qxc2 (27.Kxc2 Qxb2#; 27.Kc1 Qxb2+ 28.Kd2 cxd1=Q+ or c1=Q+ wins) 27... Rxb2+ and mate in three.

A.3) 26.Rxd3 c2+ (26... Rxb2+ 27.Kc1 Qxf2 28.Qe8+ Bf8 29.Rh8+ Kg7 -29... Kxh8 30.Qxf8+ Kh7 31.Rh3+ Qh4 32.Rxh4#- 30.Qxf8+ Kf6 31.Rf3+ wins for White) 27.Kxc2 (27.Kc1 Qxb2+ wins as above) 27... Qxb2+ 28.Kd1 Qb1+ ends up a bishop ahead at least.

B) 25.Kc1 Qxb2+ 26.Kd2 Qc3+ 27.Ke3 (27.Kc1 Qxc2#) 27... dxc2+ wins decisive material.

C) 25.Qxf6 Bxf6 wins a piece.

Aug-13-17  patzer2: Pretty easy Sunday (23...?) puzzle. I had no problem quickly finding the first three forcing moves 23...Rxe4! 24. Qxe4 d3 25. c3 bxc3 -+.

The only difficulty I found was after 26. Rxd3 in deciding which of several winning moves to play.

The game line which skewers the King and wins a Rook after 26...c2+ 27. Kxc2 Qxb2+ 28. Kd1 Qb1+ 29. Kd2 Qxh1 -+ looked appealing.

However, even stronger is simply 26...Qxf2! -+ forcing mate in five or less moves. One pretty possibility is 26...Qxf2! 27. Kc1 Bh6+! 28. Rxh6 cxb2+! 29. Kb1 Qf1+ 30. Kc2 Qc1#.

P.S.: <Random Visitor> Thanks for the deep stockfish 8 analysis of the improvement 12. Bg5 ±. Just curious. What 8-core processor are you running?

I see at that AMD has a 16-core Ryzen coming out this month, and that Intel plans to top that with an 18-core i9. For now I'm content with my 4-core i7-4790 running Stockfish 8 at 3.6 GHZ.

Aug-13-17  Cheapo by the Dozen: Remarkably easy as Sunday puzzles go.

As multiple people have already observed, finding the first three moves is easy, and after that many choices are good.

Black has a lethal discovered attack with ... d3, but to make it work he has to avert the queen exchange at f6. ... Rxe4 solves that problem, since White has no alternative to capture. Black will obviously pick up pawns for the exchange while pursuing a murderous attack, and White doesn't have any serious counterthreats.


Aug-13-17  malt: Better than yesterdays
23...♖:e4 24.♕:e4 d3 25.c3 bc3 26.♖hf1
( 26.R:d3 Q:f2 )
( 26.b3 c2+ )
Aug-13-17  beonlychampion: Well it seems like now a days chessgames are giving very very tough friday n saturday puzzeles and easy sunday puzzeles i m curious y its sooo... Not complaining ..... Btw after re4 be4 d3 if kc8 then qb2 kd2 qc2 ke3 wht u guys think abt kf8!?
Aug-13-17  RandomVisitor: <patzer2><Just curious. What 8-core processor are you running?>

My desktop PC is an AMD, 8 true core, FX-8370 at 4.21 GHz running Windows 7 64-bit with 32GB installed RAM.

I bought the motherboard/processor on Amazon and assembled it myself.

And yes, I will be upgrading when the new processors come out.

Aug-13-17  patzer2: <RV> Thanks! I see the FX-8370 is quite affordable right now at for $143.30.

I tend to wait until new technology gets less expensive before buying. However, at this price for a decent 8-core processor, assembling your current system (which would apparently be an improvement over my 4th generation i7-4790 running at 3.6 GHZ on windows 10 Pro with 16 GB Ram) might be within my budget.

Premium Chessgames Member
  FSR: Unless I'm missing something, I'm not sure how this is a Sunday puzzle. 23...Rxe4 24.Qxe4 d3 25.c3 bxc3 looks obvious and crushing, e.g. 26.b3 c2+.
Aug-13-17  ChessHigherCat: <FSR: Unless I'm missing something, I'm not sure how this is a Sunday puzzle. 23...Rxe4 24.Qxe4 d3 25.c3 bxc3 looks obvious and crushing, e.g. 26.b3 c2+.>

If you want to make it more challenging, trying making the Queen sacrifice work, which is how I started out:

If 23. Qf3 Rxe4 24. Qxe4 d3 25. c3 Qxc3 26. bxc3 bxc3+.

Now, if 27. Ka1 c3+ 28. Qd4/e5 BxQ#

If, on the other hand 27. Kc1, the attack fizzles out.

I analyzed that line first because it seems like the more "amazing, puzzle-like" solution, but these puzzles are always game-oriented.

Premium Chessgames Member
  Gregor Samsa Mendel: <FSR: Unless I'm missing something, I'm not sure how this is a Sunday puzzle.> I think CG puts in these easier Sunday puzzles every once in a while so that patzers like me will try solving all the Sunday puzzles on the off chance that it's one of these. I definitely felt a rush of satisfaction when I solved this, an actual Sunday Puzzle, although it was mixed with a feeling that it was a bit on the easy side.
Aug-13-17  patzer2: <RV> Since you're in the market for a new chess processor for faster and better results using Chess analysis programs, I though you might be interested in Albert Silver's article "AMD Releases New Ryzen Computer" March 3, 2017 at which gives a speed processing benchmark (i.e. KNPS -- higher is better) for popular AMD and Intel Processors while running Stockfish and Komodo.

Looks like they were particularly impressed with the 8-core AMD Ryzen 7 1800X CPU's performance as compared to the 8-core Intel i7-6900K CPU, especially when price is taken into consideration.

Aug-13-17  JASAHA: I think in some time zone it's already Monday. Hardly "insane" .
Aug-13-17  morfishine: More Tues-Wed ish than anything
Aug-13-17  TheBish: K Forster vs Kupchik, 1946

Black to play (23...?) "Insane"

I know I've seen this one in a book somewhere (or maybe a tactics program), so I can't take any credit. But I don't think it's so insane, I would play this without too much thought whether in a blitz game or a slow tournament game. Black gets a powerful attack on the dark squares at the cost of just an exchange. Note how much stronger Black's bishop is than White's, or either of his rooks for that matter!


Only way to keep the attack going, as White can't trade queens now. (Is there any other move to look at?)

24. Qxe4 d3 and the king hunt is on!

Aug-14-17  stst: overdue for me... busy ... though I remember opting for 23.......d3 to continue...despite RxB might be better....
Premium Chessgames Member
  Richard Taylor: I solved this one it seemed fairly easy. But thematic.
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