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Subject: Re: Can any program reproduce the closing moves of the evergreen game?

Author: Robert Hyatt

Date: 19:18:58 12/15/98

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On December 15, 1998 at 22:08:20, Dann Corbit wrote:

>After ten minutes Crafty still likes Rxe7, but does not see the same line as was
>actually played out.  It seems fairly obvious now, that the best defense was to
>simply ignore the offer.  So this one was a real sucker punch.
>
>12->  10:23   1.16 1. Rxe7+ Kd8 2. Rxd7+ Kc8 3. Rd8+ Kxd8
>                   4. Bf5+ Qxd1+ 5. Qxd1+ Nd4 6. Bh3 Be4
>                   7. cxd4 Ba5 8. Be7+ Ke8 9. Qa4+ c6
>                   10. g3 Rb1+ 11. Bf1 Bb6
>
>For the second game, the queen sacrifice was seen instantly.  So an auxilliary
>question is, how far back can we take it in the sequence and still see the mate?
> Even though it is not very deep, this would have to be regarded as a true and
>irrefutable sacrifice, would it not?
>
>  2   0.00 Mat02 1. Qf6+ Nxf6 2. Be7#
>  2->   0.01 Mat02 1. Qf6+ Nxf6 2. Be7#
>              time=0.01  cpu=100%  mat=-12  n=771  fh=81%  nps=10000
>              ext-> checks=40 recaps=4 pawns=0 1rep=11
>              predicted=0  nodes=771  evals=259
>              endgame tablebase-> probes done=0  successful=0


No.. wrong term.  "combination" is what you are looking for.  "sacrifice"
usually means offering something where you get nothing *tangible* back.  IE
sacrifice the exchange to get pressure in the center that may or may not win
later on.  The above is not a sac, because you get more back than you invest,
ie you give up the queen, but win the game...



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