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Blitz (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 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 à 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#)

Feb-02-22
Premium Chessgames Member
  FSR: I tried to submit <Belle of the Ball>, but not surprisingly someone had beaten me to it. This should have been GOTD decades ago. What a beauty!
Feb-04-22
Premium Chessgames Member
  FSR: I submitted this correction slip: <In light of the annotation by David Levy "Only now does BLITZ 6.5 realise that it must lose material." White's name should be Blitz 6.5 (Computer), not Blitz 5 (Computer) as you have it.>
Feb-04-22
Premium Chessgames Member
  MissScarlett: Should every version of any computer program have its own page? I think not.
Feb-04-22
Premium Chessgames Member
  Stonehenge: I think chessprogramming.org can be the standard here.

If a computer program has it's own page on chessprogramming, it can or perhaps should have its own page here too.

I wish CG opened the links to chessprogramming in a new tab.

Feb-05-22
Premium Chessgames Member
  FSR: <MissScarlett: . . . I think not.>

That explains a lot! (insert laughing emoji here)

Mar-26-22  rwbean: There are at least four moves which mate faster than 10... Rxh2 ... but it was a great finish!

10... Qh4 11. h3 d5 12. Nxe4 dxe4 13. Be6 Bxe6 14. b3 Bxh3 15. Ba3 Bxg2 16. Bxc5+ Kf7 17. Qh5 Rxh5 18. f4 Ne2+ 19. Kxg2 Qg3# (mate in 10)

10... d5 11. Nxe4 Qh4 12. h3 dxe4 13. Be6 Bxe6 14. b3 Bxh3 15. Ba3 Bxg2 16. Bxc5+ Kf7 17. Qh5 Rxh5 18. f4 Ne2+ 19. Kxg2 Qg3# (mate in 10)

10... d6 11. Nxe4 Qh4 12. h3 Bxh3 13. Nxc5 Bxg2 14. Nd7+ Ke8 15. Re1+ Kd8 16. Re8+ Kxe8 17. f3 Qg3 18. Qe1+ Qxe1+ 19. Kxg2 Qh1+ 20. Kf2 Qxf3+ 21. Ke1 Nxc2# (mate in 12)

10... Qe5 11. h3 Ng5 12. Bd5 d6 13. Re1 Nxh3+ 14. gxh3 Qg5+ 15. Qg4 Bxg4 16. d3 Qh4 17. Re3 Bxh3 18. Bf3 Qg5+ 19. Bg4 Qxg4+ 20. Rg3 Nf3+ 21. Kh1 Bf1+ 22. Bh6 Rxh6+ 23. Rh3 Rxh3# (mate in 14)

The game move:

10... Rxh2 then the only ways to avoid immediate mate are 11. g3 or 11. Qg4 ...

11... Nxg3 12. Kxh2 Qh4+ 13. Kg2 Nxf1 14. Bd5 d6 15. Kxf1 Bh3+ 16. Bg2 Re8 17. d3 Bxg2+ 18. Kxg2 Re1 19. Bg5 Qxg5+ 20. Kh3 Rxd1 21. Rxd1 Qh5+ 22. Kg3 Qf3+ 23. Kh2 Qg4 24. Rf1 Nf3+ 25. Kh1 Qh3#

11. Qg4, then 11... Rh4

then there's about five moves which don't lead to a very quick mate.

12. Be6 Rxg4 13. Bxg4 Qh4 14. Nxe4 Qxg4 15. Re1 holds off

12. Qxe4 Rxe4 13. Nxe4 Qxe4 ... 14. a4 Qg4 15. Ra3 Bxa3 16. Re1 Bd6 17. Re3 Qd1+ 18. Bf1 b6 19. b4 Qxc1 20. f4 Bxb4 21. Re4 Bc5 22. c3 ... seems to hold off for a while

12. Qxh4 Qxh4 13. Nxe4 Qxe4 transposing

12. Nxe4 then 12... Rxg4 13. Re1 Nf3+ 14. Kf1 Rxg2 15. Kxg2 Nxe1+ 16. Kf1 Qxe4 17. d4 d5 18. Be3 dxc4 19. dxc5 Bg4 20. f3 Qxf3+ 21. Bf2 Qh1+ 22. Bg1 Qg2+ 23. Kxe1 Qe2#

12. Be2 then ... 12... d6 13. g3 Bxg4 14. Bxg4 Qg5 15. Bh3 Rxh3 16. Kg2 Qh5 17. Re1 Rh2+ 18. Kg1 Rxf2 19. Nxe4 Qh2#

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