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Blitz 5 (Computer) vs Belle (Computer)
ACM NACCC (1978), Washington, Dec-??
Four Knights Game: Spanish. Rubinstein Variation (C48)  ·  0-1
ANALYSIS [x]

FEN COPIED

Annotations by David Neil Lawrence Levy.

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sac: 10...Rxh2 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Feb-13-06  Autoreparaturwerkbau: <Blitz 5> was surely a very strong computer. It probably had 64B of hard disc, over 70 mix-coloured bulbs, half-a-mile of wires, a prototype of RAM and other terrific hardware. And of course, it took 2 floors of building.
Apr-27-06  dakgootje: If you look at the strenght of most of the chessplaying computers back then its a very nice combination by black!
Apr-27-06  dutchboy13: black was a really good computer i like the way this was played
Apr-27-06  THE pawn: Black to play and win

10...?

It would be a good monday puzzle.

Apr-27-06  dakgootje: <THE pawn> Maybe more of a tuesday as there is some, not much but some, calculation needed.
Apr-27-06  THE pawn: It would be a bad monday puzzle.
Jun-13-07  piroflip: it was around this time that a clubmate of mine stated that "computers will never play to grandmaster standard". this combination is G/M like in my book.
Dec-12-07
Premium Chessgames Member
  OhioChessFan: Whew. I spent 10 minutes looking at various Engine's game pages and gave up. Looked back at the clues page and it was solved! How exactly did you find this Aurora?
Dec-12-07  Aurora: Yabba Dabba Doo !!!!!!!!
Dec-12-07  Aurora: <OhioChessFan> I spent 3 minutes clicking through

White: (Computer)
Black: (Computer)
Number of moves is: no more than 20 moves
Result is: black wins

Dec-12-07
Premium Chessgames Member
  OhioChessFan: LOL, I just randomly worked through the older computers. How'd you figure it was Black winning?
Dec-12-07  Aurora: <OhioChessFan> I checked out white wins first. Negative.
Dec-12-07
Premium Chessgames Member
  al wazir: What happens after 11. Nxe4 ? If 11...Qh5, then 12. Ng3. If 11...Qxe4, then 12. Kxh2.
Dec-12-07  The beginner: <Al wazir>

After 11 Nxe4
..Qh4
12 Ng3 .. Qxg3!
Threatening mate Qxg2 or if white takes the Queen
13 fxg3 then Nf3 mate.

Dec-13-07
Premium Chessgames Member
  al wazir: <The beginner>: Thanks. I should have seen that; it's essentially the same as the combination that yielded mate in the game as played.
Dec-13-07  arnaud1959: <piroflip:..."computers will never play to grandmaster standard"> In early 80's people were about to give up on working on chessprograms because they understood that a computer should calculate too much moves to be able to beat a human with a deep positional understanding. Since then lot of progress has been made in calculating capacity of computers and in strategy simulation.
Feb-16-09  m0nkee1: that is a very nice attack :) well done puter
Dec-19-14
Premium Chessgames Member
  Eggman: The finish given above by <The beginner> (from the diagram)


click for larger view

11.Nxe4 Qh4 12.Ng3 Qxg3 13.fxg3+ Nf3#, would have been quite unusual and very pretty indeed - to let the opponent capture your queen with check and then block this check with your own double check / mate, with the knight arriving just in time to defend the attacked rook - it doesn't get much prettier than that.


click for larger view

Granted it is not terribly difficult to see.

Apr-19-17  RolandoFurioso: Very impressive indeed - back in 1978! 10...Rxh2!! is definitely a stunning move that immediately wins.

I've just checked the position after 10. O-O with some recent chess engines: while requiring less than 20 minutes search time, they even announce mate here - e. g.: 10. .. Qe7-h4 (+M11/17 1125 Fischerle_0_9_80_SE_64Bit) h2-h3 Ne4-g5 Bc4-e6 d7xe6 Qd1-g4 Nd4-f3+ g2xf3 Ng5xh3+ Kg1-g2 Nh3-f4+ Qg4xf4+ Qh4xf4 Rf1-h1 Rh8xh1 Kg2xh1 Qf4xf3+ Kh1-g1 Qf3xf2+ Kg1-h1 Qf2-g1# (M11)

And there seems to be an even fasterv line to mate (M10) that starts with 10. .. d7-d5: 10. .. d5 +M10/51 3635 Stockfish 7 x64 11. Nxe4 Qh4 12. h3 Bxh3 13. Nxc5 Bxg2 14. Nd7+ Kf7 15. f3 Qg3 16. Bxd5+ Ne6 17. Ne5+ Kf6 18. Ng4+ Ke7 19. Bxb7 Rh1#)

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