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Dick Sorensen vs Jan Mose Nielsen
Politiken Cup (2012), Helsingor, rd 10, Aug-05
Sicilian Defense: Smith-Morra Gambit (B21)  ·  0-1
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Aug-08-12  Troller: One shouldn't play Morra Gambit and not know this.
Aug-19-12
Premium Chessgames Member
  SonOfSteel: Ahh... The old "Siberian Trap" method! Oh ja, ja!

Nor would 9. h3... be effective here. This would only make 9...Nd4! even more pleasing. After the erroneous 8. 0-0?...
white must resort to the unattractive 9. g3... or 9. Be3...

Aug-19-12  DanielBryant: How embarrassing.
Jan-29-13
Premium Chessgames Member
  FSR: What <Troller> said. Incredibly naive play by White. The Siberian Trap has been around since 1987 and is quite well-known by now. It's not a great line for Black if White avoids falling into it.
Jan-29-13  Shams: <FSR> It has to be older than 1987, don't you think??
Jan-29-13
Premium Chessgames Member
  FSR: <FSR> Are you making a funny? http://en.wikipedia.org/wiki/Siberi...
Jan-29-13  Shams: <FSR> Are you asking me? I wasn't, actually. I'm a sad sack at geographical trivia. I'm just surprised a nine-move trap in a popular chess line was discovered in my lifetime.
Jan-29-13
Premium Chessgames Member
  FSR: <Shams> No, it really was invented in 1987 or so. http://en.wikipedia.org/wiki/Sicili... Opening Explorer
Jan-29-13
Premium Chessgames Member
  perfidious: Now and again, the 'similar games' feature calls up some curious and amusing scenarios: in this instance, 9.a3 is referred to a 'novelty', while two other moves played in the DB (9.Bg5 and 9.Bb3) lose in the same way. White is 0-5 here from the position after 8....Ng4, dodgy though it looks against non-losing moves at his ninth turn.
Jan-29-13
Premium Chessgames Member
  FSR: <Shams> I'm sure the Siberian Trap is far from the only trap discovered in your lifetime. For example, the 7.Nge2?? Ng4! trap in the Black Knights' Tango, Opening Explorer, was first seen in 1992 according to Mega Database 2013. That's an important trap, with 20 victims in that database. But it's true that the Siberian Trap has more: after 8...Ng4 in the Siberian, Mega 2013 shows 53 people responding with fatal blunders (9.h3?? 43, 9.Bb3?? 5, 9.Bg5?? 3, 9.Kh1?? 1, and this Dick with 9.a3??). White usually finds something better: 9.g3 93, 9.Nb5 91, 9.Rd1? 60, 9.Be3?! 12, 9.Nd5!? 10, 9.e5!? 2.
Jan-29-13
Premium Chessgames Member
  Phony Benoni: The Siberian Trap mechanism was known long before 1987. We just haven't yet found an example of it in the Smith-Morra before that time.

It dates back to at least Marshall, and earlier I am sure:

Marshall vs J Hopkins, 1916


click for larger view

<10...Nd4!>

Jan-29-13
Premium Chessgames Member
  Phony Benoni: Here's a very early version, though slightly more complicated, from Cochrane vs Mohishunder, 1855:


click for larger view

<18.Nd5! exd5 19.Bxf6!>

Jan-30-13
Premium Chessgames Member
  FSR: <Phony Benoni> Those are very impressive examples. How did you find them? I applied the search mask to Mega Database 2013 just now and looked for similar sacs. I found 73 games, but weirdly they only dated back to 1990. A majority were Siberian Traps; again this is strange, since the search should have picked up Siberian Trap games dating back to at least 1987. And much older than that for games in the English and such where White uses the same motif. Cochrane-Mohishunder must surely be one of the earliest examples of that.
Jan-30-13
Premium Chessgames Member
  FSR: <Phony Benoni> Hmm, I see that one can use CG.com's Sacrifice Explorer, which I'm guessing is what you did. That gets a lot more chaff, but also more wheat, than my method - although I don't understand why my method wasn't more productive than it was.
Jan-30-13  Shams: <Those are very impressive examples.> Yes I agree. A mind like a Dewey Decimal system.
Jan-30-13
Premium Chessgames Member
  Phony Benoni: <FSR> I've downloaded the <cg> database into my copy of ChessBase, which has a position search. Then I searched for the basic skeleton of the combination:


click for larger view

On ChessBase, the search will bring up any position with this skeleton regardless of what other pieces are on the board. I also did some other searches, varying the skeleton somewhat.

A few more older examples:

P F Johner vs Tartakower, 1928

S Rosselli del Turco vs Stoltz, 1935

Chernev vs M L Hanauer, 1938

B Altman vs G Katz, 1943

A Ostrauskas vs Gipslis, 1957

Jan-30-13
Premium Chessgames Member
  FSR: <Phony Benoni> Cool - though you don't really need the pawn on h3. In some games with the theme, including the present game, the trappee doesn't play h3. How do you download the whole CG database to ChessBase?
Jan-30-13
Premium Chessgames Member
  Phony Benoni: <FSR> Downloading the database is not a quick process. Probably the fastest way is by using the zipfiles available to premium members:

Zipfile Archive

I use the slower method of downloading each ECO section. This takes much more time, but I get to gather all sorts of fascinating statistics along the way. Also it tends to be more up to date than the zipfiles.

Some of the tech gurus here may know better ways.

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