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Subject: Re: Another example of very deep tactics that Computers cannot solve

Author: Leo Dijksman

Date: 10:53:01 12/07/01

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On December 07, 2001 at 12:48:22, ALI MIRAFZALI wrote:

>The following position occured in one of the oldest Correspondence games
>played in America:
>[D] 2kr3r/ppp2ppp/1b3nq1/4p2b/1PB1P3/2P1B3/P1QN1PPP/R4RK1  b   - 0 1
>This game was played in 1840.
>Here black played 15...Rxd2!! Game finished with 16.Qxd2 Nxe4 17.Qc1 Bf3
>18.g3 h5! 19.Bd5 h4 20.Bxe4 Qxe4 21.Bxb6 Qg4 22.Qe3 axb6 23.R(f)-b1  e4
>24.Qe1 f5! 25.Rb2 f4 26.R(a)-b1  Black announced Mate in Some number of moves.
>Fritz 6 and chessmaster 8000 donot see 15...Rxd2!! No matter how long one runs
>the position.
>Does your program see 15...Rxd2!!!.Althuogh Tactics is the area that Computers
>are naturally strong ;it is interesting that one still runs into tactical
>positions which programs cannot solve.Please indicate your result.

Quark analises:

Input to Quark: analyze
 1     48       1        687 b6e3
 2     48       1        885 b6e3 f2e3
 3     69       1       1767 b6e3 f2e3 g6g5
 4     78       3       8530 b6e3 f2e3 g6g5 g1f2
 5    102       6      16682 b6e3 f2e3 g6g5 a1e1 c7c6
 5    102       8      21536 b6e3 f2e3 g6g5 a1e1 c7c6
 6     78      12      37204 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1
 6     78      15      51210 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1
 7     96      22      78308 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1 h6f6
 7     96      32     132901 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1 h6f6
 8     84      61     251362 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1 h6c6 c4d5
 8     84      85     385845 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1 h6c6 c4d5
 9     81     425    1609169 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1 h6g5 a2a4 g5h4
 9     81     577    2391642 b6e3 f2e3 g6h6 f1e1 f6g4 d2f1 h6g5 a2a4 g5h4
10     93    1238    5043519 b6e3 f2e3 g6g5 f1e1 d8d6 a2a4 h8d8 d2f1 d6c6 c4d3
10     93    1375    5763372 b6e3 f2e3 g6g5 f1e1 d8d6 a2a4 h8d8 d2f1 d6c6 c4d3
11    111    2097    8959777 b6e3 f2e3 g6g5 f1e1 d8d6 c4f1 f6g4 d2c4 d6f6 c2a4
a7a6
11    111    2552   11193988 b6e3 f2e3 g6g5 f1e1 d8d6 c4f1 f6g4 d2c4 d6f6 c2a4
a7a6
12    109    4584   20252371 b6e3 f2e3 d8d7 f1f2 h8d8 h2h3 g6g3 d2f1 g3h4 g2g4
h5g6 c4b5
12    109    5878   27069281 b6e3 f2e3 d8d7 f1f2 h8d8 h2h3 g6g3 d2f1 g3h4 g2g4
h5g6 c4b5
13    118    9915   44695206 b6e3 f2e3 d8d7 h2h3 g6g5 a1e1 g5g3 g1h1 h8d8 d2b3
c7c6 a2a4 h7h6
13    119   14334   68847269 d8d2 !
13    122   15096   72748195 d8d2 c2d2 f6e4 d2d3 h8d8 d3b1 b6e3 f2e3 d8d2 g2g3
e4c3 b1g6 f7g6
13    122   16963   82356307 d8d2 c2d2 f6e4 d2d3 h8d8 d3b1 b6e3 f2e3 d8d2 g2g3
e4c3 b1g6 f7g6
Input to Quark (in pondering): exit
Input to Quark: force
Input to Quark: quit

Leo.



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