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Ottokar Martius vs Klaus Viktor Darga
Hamburg (1958)
Sicilian Defense: Chekhover Variation (B53)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
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Jan-04-06  Inf: woohoo this is THE 1st puzzle i figured out... and quite easy i should say. got it under 20 sec. :D
Jan-04-06
Premium Chessgames Member
  patzer2: <Doktorn> In your example, it's true the King can capture one of the double checking pieces. However, in doing so, he is fleeing from the check of the other piece.

In some combinations, the situation you describe (where one of the double checking pieces is subject to capture) is used as a tactic (i.e. decoy or deflection) to force the King to a weak square where he is subject to mate or decisive loss of material.

Jan-04-06  YouRang: I knew that 19. Rxg7+ had to be the winner, but I just didn't see the winning continuation... Double-discovered check; I'll have to remember that. :(
Jan-04-06
Premium Chessgames Member
  patzer2: Who can blame then future GM Darga for playing the "obvious and natural" 16...Nxc3 17. Bxc3 Bxg2!?, with an apparent winning double attack.

Only problem is that it appears 17...Bxg2?! may actually be the losing move. Instead, Fritz 8 recommends the defensive combination 17...Bg5+! (position below)


click for larger view

when Black gains a pawn with a clear advantage after 18. f4 (not 18. Kb1?? Bxg2! ) 18...Bxf4+ 19. Kb1 f6 20. Nxc6 Qxc6 (-1.09 @ 14 depth & 1228 kN/s).

Jan-04-06
Premium Chessgames Member
  patzer2: Speaking of double check, I found an interesting site with some puzzle examples of this tactic at http://www.academicchess.com/Games/....

Click on the links at this site to set up the position, then click on the arrow(s)s for the solution.

Jan-04-06  EmperorAtahualpa: <1228 kN/s>

<patzer2> What is the use of putting the amount of nodes per second in your analysis? It just illustrates how fast your computer is, which is irrelevant. Why not just mention the amount of nodes itself?

Jan-04-06
Premium Chessgames Member
  patzer2: <doktorn> Number 823 at http://www.academicchess.com/Games/... (diagram below) illustrates the use of a double discovered checking piece being offered up for capture by the opposing King as a decoy to force mate.


click for larger view

[White to win (mate in two) using a double check decoy]

Jan-04-06  weary willy: "Double-discovered check" - I *think* discovery is the only way to get double check.

... he said pedantically

(Some smart guy corrected my reference in a previous post to "passed pawns on the 7th")

Jan-04-06
Premium Chessgames Member
  kevin86: <patzer2>mate by ♗e8+ ♔xe8 ♕f7#

♗e6+ does not mate as the king escapes to c6

In the text game,the double rook sac is very elegant.

Jan-04-06
Premium Chessgames Member
  patzer2: <EmperorAtahualpa> I was just giving what Fritz 8 gives on infinite analysis.

Speed of a computer does seem to relate to it's accuracy in using a program per the article at http://www.chessbase.com/newsdetail.... My procesor is an Athon 64 which runs Fritz faster and with fewer problems than the P4 chip it replaced.

Jan-04-06
Premium Chessgames Member
  patzer2: <Kevin 86> Thanks for giving the correct solution to my little puzzle. <weary willy> You are correct that the most commonly used term is "double check." As far as I know, a discovered check is the only way to arrive at a double check.

As the definition of
"double check" at http://www.angelfire.com/games5/che... would indicate, a double check is a type (e.g. subcategory) of discovered check.

Jan-04-06  bloodgroove: Maybe I'm not seeing it, but how does this win the game?
Jan-04-06  morphyvsfischer: These combos are easy only BECAUSE it tells that White/Black has a combo/mate. If this was an actual game, few of us would have seen that.
Jan-04-06  TopaLove: <morphyvsfischer> IŽd see
Jan-04-06
Premium Chessgames Member
  kevin86: When a piece moves so that it uncovers a check,it is called "discovered check"

When the uncovering piece also gives check it is called "double check"

When the adverse king is unable to move from a double check-the only way to escape from a double check is to move the king-it is called "double check and mate".

A double check is always a discovered check+a direct check.

Jan-04-06  stephenw: <morphyvsfischer> This puzzle is not very difficult. I've had far more impressive mates in some of my blitz games at DuPont Circle (DC). If this was a tournament game there is no way I could possibly miss it.
Jan-04-06  fred lennox: A puzzle doesn't have to be difficult to be nice. This is a nice puzzle.
Jan-04-06  DeepBlade: The puzzle position just screams; You have to sacrifice something to win!.
Jan-04-06  TTLump: <morphyvsfischer> it IS easy for anyone, once you train yourself to always look for double-check. The power of the double check derives from that fact that BOTH pieces are immune from capture, except by the King, or to put it another way, the only LEGAL response to a double-check is a King move, and that always makes it easier to calculate. Once you get your mind around these concepts, you will never miss another double-check in a game situation!
Jan-04-06  EmperorAtahualpa: <patzer2> On the link you gave me, it does indeed read at the bottom of the page <The speed of hardware has great influence on the playing strength of the program.>. However, I think you misinterpreted what it means. It just means that a faster computer will evaluate nodes at a higher speed than slower computers, but slower computers don't necessarily make poorer evaluations, they just take more time to analyze on deeper levels. The quality of the analysis chiefly depends on the chess engine, not on the computer that is running it.
Jan-04-06
Premium Chessgames Member
  patzer2: <EmperorAtahualpa> Thanks for the comment. I did learn today that if I right click on the node speed in Fritz 8, it brings up a selection to allows you to select and see the number of nodes computed. While I might agree that the analysis quality depends more on the chess engine than on the computer, my experience with Fritz 8 indicates processing speed makes a difference -- especially when time is a consideration.
Jan-04-06  Chessman1: I found a different answer for the puzzle of the day: 19. Rxg7+! Kxg7 20.Qg4+ Kh6 (20. ... Kh8? 21.Nd7+ mate next move, Nf3+ mate next move, Nd3+ mate next move, Nc4+ mate next move, or Nc6+ mate next move; 20. ... Kf6? 21. Nc4+ (or any other knight move), and mate next move, or 20. ... Bg5? 21.Qxg5+ Kh8 22.Nxf7#) 21.Bd2+ Bg5 22. Qxg5#
Jan-04-06  bads23: if you go to Ch2 and move to Cc5
Jan-06-06  DeepBlade: Triple check is impossible in chess, too bad.
Jan-15-11
Premium Chessgames Member
  Phony Benoni: After <19...Kh8>:


click for larger view

Nobody seems to have mentioned that 20.Rg8+ also mates, probably because the 20.Nxf7+ line is even prettier.

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