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Lachex (Computer) vs J Nogueiras
National Open (1990), Las Vegas, NV USA
Modern Defense: Two Knights Variation (B06)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
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Dec-27-21  saturn2: <jes47: 12 Qf3 also wins, although not as elegantly.>

This was also my solution. It threatens g3

Dec-27-21  saturn2: The engine gives 12 Qg4 und 12.Qf3 similar advantage.
Dec-27-21  stacase: Took a few seconds to see Ne7# and that it was only guarded by Black's Queen so, can she be forced off her post? Ha! 12.Qg4
Dec-27-21  Cheapo by the Dozen: I got lucky. Once I saw that the point was to establish the mate at e7 by diverting the Black queen, I immediately saw Qg4.

Only after that did I see why g3 should be considered and discarded. I never reached the point of considering Qf3 at all.

Dec-27-21  Brenin: 12 Qf3, with the threats of 13 g3 and 13 Nf6+, was my first choice. Only then did I see that 12 Qg4 was more direct. See https://www.chessprogramming.org/La... for a short biography of White.
Dec-27-21
Premium Chessgames Member
  drollere: i missed this one through distraction. i recognized that the black Q has no escape square except Qxe4+ after g3, where it falls to the N fork at f6+, so i spent my time trying to make g3 work.
Dec-27-21  AlicesKnight: 12. Qg4 and Black must either lose the Q or succumb to the elegant 2-N mate (Ne7). I may have taken slightly longer than the computer to see it, even for a 1990 model (one of which I still have).
Dec-27-21  Mississaugan: Even early in the game, the chess computer is already computing the variation which leads to mate, combination after combination. No respect at all at the opponents. I would even say it has no regard with positional theme. With chess computers, positional chess theme is tossed outside the window. Tactics upon tactics, whew. Artificial Intelligence.

I wonder if Magnus Carlsen is considering to play a match against chess computer, just like what Garri Kasparov did when he played against IBM Deep Blue. That would be splendid.

Dec-27-21
Premium Chessgames Member
  agb2002: White is a pawn up.

Black threatens Qxe4+.

The black queen prevents Ne7#. Therefore, 12.Qg4 and wins.

Dec-27-21  fokers13: a carlsen vs any modern computer would be a slaughter naka was playing long time controls vs some random version of komodo(instead of it running on fully power hardware) with 2 pawn odds for him and could barely draw it.
Dec-27-21
Premium Chessgames Member
  Teyss: <TheaN> Thanks for this insight on the opening.
Tricky Monday. First looked at 12.Bg5 but it fails to ...Qxe4+ so looked for another way to deflect the Q. 12.Qg4 looked natural, did not see Qf3.
Dec-27-21  TheaN: <Teyss: <TheaN> Thanks for this insight on the opening. >

No problem. I keep the Modern up to date in my repertoire in a must-win situation. My former trainer and club chairman plays it as well in a rather positional fashion. That, and on my club there are a couple of Pirc and Lion enthusiasts so transpositions happen.

This variation has a bit of a sting though, for the reasons shown in this game. Because Black can't reinforce via d7 quickly, you do have to watch for an early e5 by White. That's why the Lion <may> be preferable from a stability point of view (d6-Nf6-Nbd7-e5) to absorb early pressure and allow king side defenses before they are played; essentially foregoing g6 early. But in this variation you are kind of forced to play the Nf8-g6-f4 route to keep counter play so it essentially isn't a Modern.

<mel gibson: I didn't get this puzzle. That's bad for a Monday - what's going on? >

Do you still not get it after seeing the analysis <mg>? The point is 12.Qg4 Qxg4 13.Ne7#. The Black queen has no proper ways to keep defending e7 without throwing queen for knight.

Dec-27-21
Premium Chessgames Member
  OhioChessFan: 5 years after suggesting it as a Monday POTD, I'd completely forgotten it. And when I solved it, I thought it was a little tough for a Monday....
Dec-27-21
Premium Chessgames Member
  OhioChessFan: "Lachex Surgery"
Dec-27-21  mel gibson: <<mel gibson: I didn't get this puzzle. That's bad for a Monday - what's going on? >

Do you still not get it after seeing the analysis <mg>? The point is 12.Qg4 Qxg4 13.Ne7#. The Black queen has no proper ways to keep defending e7 without throwing queen for knight.>

Of course I understood as soon as it was suggested.

It was one of those chess blindness situations.

Dec-27-21
Premium Chessgames Member
  chrisowen: The grass it is ok it v under Qg4 glock abridge axled it i v the grass it is ok under gross it is milk it walk it walt paw it buck v it banque jenny jaffa it is have a cigar it vain be op i um hits crick let pawn go clan joke it is douche vito gland vint gedulf frigged it is etc c gg got join axiom jive it is cervix creak it saw coo dutch it so x beg din i hot clad add ooh jack toll v it dog face it creed diggle it ho in ja deck frag i gov i but dutch i ten loquacious it i v creak i ten lick our dupe it c v i hog muff it aced luft crunch it is move u x whup comb a vain tick camps it clumped it foot no jag it edge frigate v it hat vito balance fee o x all i hood chump it was cuter it is garn it i Qg4 bah.
Dec-27-21  johnnydeep: Git it. A bit tricky, but a very nice tactic. Can't directly the block the black queen from defending the white knight mating square, so give her an offer she can't refuse. And even if she takes it, the game is over!
Dec-27-21
Premium Chessgames Member
  maytintan: after 9.......Kf8 i don't see an obvious win
Dec-27-21  TheaN: <maytintan: after 9.......Kf8 i don't see an obvious win>

10.Ne6+ Kg8 (else disaster still) 11.Nxc7 +- is pretty bad.

<<mg> Of course I understood as soon as it was suggested.>

Okay, I was a bit struck by your "what's going on?" almost sounding like you had no idea how the puzzle worked :>

Dec-27-21
Premium Chessgames Member
  PawnSac: < OhioChessFan: "Lachex Surgery" >

good one! I hope you submitted it!

Dec-27-21  dhotts: Computers of today would not have missed the immediate path to destruction with 6.Bxf7!...6.Ng5 was OK, but not the best.
Dec-27-21
Premium Chessgames Member
  Peligroso Patzer: Compare: Yermolinsky vs E Tate, 2001 .

In Mega Database 2019, the identical moves are given for a game by Lachex in which the player of the Black pieces is Jose M. Santiago, and the event is the Jacksonville Open (1990).

Dec-27-21
Premium Chessgames Member
  monopole2313: La Shay! I was at the 1990 National Open and remember Lachex there. But I doubt if Nogeiras was the opponent. If I can find the crosstable, the matter could be settled.
Dec-27-21  landshark: 12.Qg4.

I hung my queen again -
Oh! - it led to mate (:

Dec-28-21  sudoplatov: As one-half to the LACHEX programming team, I can say it wasn't Grandmaster Nogeiras. I cannot find the crosstable on the 'Net so I don't remember who it was. (I do remember the mate though.) I think it was another player with the same last name.
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