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Subject: Re: How many programs see the winning move 1...c5! Not 1....Rd8? or ...R

Author: Jim Bond

Date: 18:12:24 04/16/03

Go up one level in this thread


On April 15, 2003 at 16:13:46, Jorge Pichard wrote:

>Lautier versus Kasparov Tilburg, 1997.
>   Here Kasparov made the terrible mistake to accept a draw (which cost him
>clear first) instead of winning a pawn by 1...c5! Notice that Black makes no
>progress after 1...Rd8? 2.Kf1 giving White time to defend his weak back rank.
>You will notice that most programs will play 1...Rb8 2.Rxc6 Rxb4 3.Rc2 Rxe4 very
>materialistic moves by grabbing as many pawns as possible, but it is very hard
>to win, because all the pawns are on the same side of the board.
>
>7r/2R1bkpp/2p1pp2/8/1P2P3/8/1B3PPP/6K1 b - - 0 1

Shredder 7.04 does in less then 1 sec!

New game
7r/2R1bkpp/2p1pp2/8/1P2P3/8/1B3PPP/6K1 b - - 0 1

Analysis by Shredder 7.04:

1...Rb8 2.Rxc6 Bxb4
  =  (0.02)   Depth: 1/3   00:00:00
1...Rb8 2.Rxc6 Bxb4
  =  (0.02)   Depth: 1/3   00:00:00
1...c5 2.b5 Rb8 3.Bc3 Rxb5 4.f3 Rb3 5.Bd2 Rb2 6.Be3
  -+  (-1.43)   Depth: 1/3   00:00:00
1...c5 2.b5 Rb8 3.Bc3 Rxb5 4.f3 Rb3 5.Bd2 Rb2 6.Be3
  -+  (-1.43)   Depth: 1/10   00:00:00
1...c5 2.b5 Rb8 3.Bc3 Rxb5 4.f3 Rb3 5.Bd2 Rb2 6.Be3
  -+  (-1.43)   Depth: 2/2   00:00:00
1...c5 2.b5 Rb8 3.Bc3 Rxb5 4.f3 Rb3 5.Bd2 Rb2 6.Be3
  -+  (-1.43)   Depth: 3/3   00:00:00
1...c5 2.b5 Rb8 3.Bc3 Rxb5 4.f3 Rb3 5.Bd2 Rb2 6.Be3
  -+  (-1.43)   Depth: 4/4   00:00:00
1...c5 2.b5 Rb8 3.Bc3 Rxb5 4.f3 Rb3 5.Bd2 Rb2 6.Be3
  -+  (-1.43)   Depth: 5/5   00:00:00
1...c5 2.b5 Rb8 3.Bc3 Rxb5 4.f3 Rb3 5.Bd2 Rb2 6.Be3
  -+  (-1.43)   Depth: 6/6   00:00:00
1...c5 2.b5 Rb8 3.Bc3 Rxb5 4.f3 Rb3 5.Bd2 Rb2 6.Be3
  -+  (-1.43)   Depth: 7/7   00:00:00
1...c5 2.b5 Rb8 3.Bc3 Rxb5 4.f3 Rb3 5.Bd2 Rb2 6.Be3
  -+  (-1.43)   Depth: 8/8   00:00:00
1...c5 2.b5 Rb8 3.Bc3 Rxb5 4.f3 Rb3 5.Bd2 Rb2 6.Be3
  -+  (-1.43)   Depth: 9/9   00:00:00
1...c5 2.Kf1 Rb8 3.f3 cxb4 4.Ke2 e5 5.Ke3 Ke6 6.Rc6+ Bd6
  -+  (-1.51)   Depth: 10/19   00:00:01  203kN
1...c5 2.Kf1 Rb8 3.f4 cxb4 4.Ke2 Ra8 5.Kd3 Ra2 6.Kc2 g6
  -+  (-1.41)   Depth: 11/20   00:00:04  697kN
1...c5 2.Bc3 Rb8 3.b5 Rxb5 4.f3 Rb3 5.Bd2 Rd3 6.Ba5 f5 7.Kf2
  -+  (-1.44)   Depth: 12/23   00:00:09  1420kN
1...c5 2.Bc3 Rb8 3.b5 Rxb5 4.f3 Rb3 5.Bd2 Rb2 6.Be3 Rc2 7.Bd4
  -+  (-1.43)   Depth: 13/24   00:00:17  2594kN
1...c5 2.Bc3 Rb8 3.b5 Rxb5 4.Kf1 Rb1+ 5.Ke2 Rg1 6.Kf3 g5 7.h3 h5 8.Bb2 Re1
  -+  (-1.41)   Depth: 14/24   00:00:28  4308kN
1...c5 2.Bc3 Rb8 3.b5 Rxb5 4.Kf1 Rb1+ 5.Ke2 Rg1 6.Kf3 g5 7.h3 h5 8.e5
  -+  (-1.41)   Depth: 15/28   00:00:50  7706kN




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