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Hans Kmoch vs Lodewijk Prins
Amsterdam (1940), Amsterdam NED, rd 5, Feb-14
Gruenfeld Defense: Russian. Levenfish Variation (D97)  ·  1-0



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Given 6 times; par: 14 [what's this?]

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Kibitzer's Corner
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Premium Chessgames Member
  agb2002: I forgot to include 17... Kg8, already pointed out by <PB> and <dfcx>.
Premium Chessgames Member
  morfishine: <17.Rxf7+> Looks best; running doesn't help: 17...Kh8 18.Rxh7+ and Black is being devoured; capturing brings no relief: 17...Rxf7 18.Nxe6+ Kg8 19.Nxd8 is pretty icky with the Black rook pinned

yeah, 17.Rxf7+ looks best


Mar-22-16  Viennablue: Finding a mate in 7 (which is necessary after ...17.Kh6) surprised (& beated) me on an ordinary Tuesday 😊
Mar-22-16  leRevenant: Solved this one instantly, in contrast to yesterday's.
Mar-22-16  leRevenant: <Penguincw:> full marks for honesty.
Mar-22-16  cocker: I trust that all the people who found it easy, saw the mate after 17 ... Kh6.
Mar-22-16  Razgriz: Was fixated at 17. Bxe6 for the fork that wins the queen but fxe6 is not forced....
Mar-22-16  gofer: The start is simple...

<17 Rxf7+ ...>

The rook is immune...

17 ... Rxf7
18 Nxe6+

The king can't run forwards...

17 ... Kh6
18 Rxh7+ Kxg5
19 h4+ Kf5 (Kf6 Rf1# or Kg4 20 Be2+ Kg5 21 Rf1#)
20 Rf1+ Kg4
21 Be2#

Allowing the rook to check the king is a disaster...

17 ... Kh8
18 Rxh7+ Kg8
19 Bxe6+ Rf7
20 Bxf7+ Kf8
21 Ne6+ Ke7

17 ... Kg8
18 Nxe6! Q anywhere
19 Nxf8

Hmmm, so all roads lead to a quick win...


No wonder black resigned...

Mar-22-16  The Kings Domain: I nearly got this. Close, but not quite. :-)
Mar-22-16  JohnBoy: For <patzer2> - Aerosmith has a different take on "Back in the Saddle".

Mar-22-16  Harvestman: At GM level 17.Rxf7+ Rxf7 18.Nxe6+ Kf8 19. Nxd8 Rxd8 is resignable. At my level black would certainly play on with chances of a draw, especially if black can exchange rooks.
Premium Chessgames Member
  gawain: I did get 17 Rxf7+ Rxf7 18 Ne6+ to acquire the queen (and a pawn) in exchange for rook and knight.

Why did Black resign? <Harvestman> asks.

After most of the dust dies down--18... Kg8 (the least bad move) 19 Nxd8 Rxd8--the black rook on f7 is skewered.

click for larger view

White will simplify into a position that anyone (even I) can win. 20 Rf1 Rdd7 21 Rxf7 etc. White has six pawns and a knight against five pawns.

The nifty point is that back at move 18 the White knight prevents Black from playing ...Kf8. Kg8 leads to the skewer but other K moves are worse (even ...Kf6) because they eventually leave the rook en prise.

Mar-22-16  saturn2: Rxf7 makes it, although the answer Kh6 required some further calculation from me.
Premium Chessgames Member
  kevin86: I was looking for a bishop or knight sac. Instead the winning hand was a rook sacrifice. the following family check will win it.
Mar-22-16  YetAnotherAmateur: Rxf7+ obviously does the job, but it's important to notice that whether or not black takes the rook the correct response is Nxe6 to win the queen.
Mar-22-16  zanzibar: Came back to play over the game to see how Black got in hot water...

Have to wonder why he played 15...c7-c5, it just looks bad, as even 16.dxc5 shows:

click for larger view

Let's say 15...e6 was better, shall we?

Premium Chessgames Member
  patzer2: <JohnBoy> Thought you might enjoy the recent report of 67-year-old Steven Tyler, who co-wrote the Aerosmith version of "Back in the Saddle Again," moving in with his 28-year-old girlfriend.

I've enjoyed Steven Tyler as an entertainer and especially as an American Idol Judge. He seems to be a fun-loving and genuinely nice person.

As a fellow 67-year-old grand parent (see the recent article at I wish Steven all the best in his future endeavors.

Mar-22-16  Cheapo by the Dozen: I just calculated that White wins at least 2 pawns while smashing Black's position (because the rook is poisoned), and stopped there.
Mar-22-16  loveswesterns: I agree with MostlyWatch. As a novice, it would be instructive to me if there was an indication of a player resigning, and then the puzzle continued to its most logical mate conclusion so I can see what the GM saw when he resigned. As it is, I learned nothing from this "easy" puzzle. As a novice, I don't have the ability to visualize steps in my head, so continuing the puzzle would provide a visual aid for me to follow the game to its conclusion (had the player not resigned). This would be especially helpful for the Monday and Tuesday puzzles.
Mar-22-16  FlashinthePan: There is no way this is an easy puzzle if one is supposed to have seen all the variations leading to mate to have solved it.
Mar-22-16  Grnhorn: Being a novice also.. I found it hard to go over all the possible scenarios to this game! but I did found the exercise helpful.. we can't be spoon fed everything and learn at the same time. So yeah!, the puzzle was harder than a normal Tuesday!
Mar-23-16  notyetagm: Kmoch vs Prins, 1940

17 ?

click for larger view

17 ♖f1xf7+! 1-0 <remove guard: e6-sq>

click for larger view

17 ... ♖f8x♖f7 18 ♘g5xe6+ <royal fork>

click for larger view

Mar-23-16  notyetagm: Kmoch vs Prins, 1940

Game Collection: ILLUSORY PROTECTION 17 Rf1xf7+! Rf8xRf8 f7-rook cannot protect e6-sq like f7-pawn

Mar-23-16  zanzibar: <loveswesterns> yes, that's one problem with the <CG> puzzles; they're nice positions but you don't get to play them out.

Admittedly, nobody really does this well, in the sense of playing out all the variations. But I think the best place for improving tactical play is over at <ChessTempo>, at least at my level.

If you register you can get a rating, and you'll be fed problems according to your level. <CT> forces you to play out the line, to truly test understanding.

And all the positions come from real games.

Some people lack the patience for it (when you fail a problem, you really fail), but it's well worthwhile. Be sure to read the problem comments left by other users to make sure you saw all the lines involved, including those unplayed.

Try it, and see what you think.


Mar-27-16  loveswesterns: <zanzibar> Thanks for the tip. I'll check out the site. Sounds promising.
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