Author: Dann Corbit
Date: 18:32:17 12/07/01
Go up one level in this thread
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.
Yace did not find it in 999 seconds.
white ( 1): epdtest \rxd2.epd
2kr3r/ppp2ppp/1b3nq1/4p2b/1PB1P3/2P1B3/P1QN1PPP/R4RK1 b - - bm Rxd2;
Stored 39 learned positions into hash table
solution Rxd2!
usetime = 998.00, mintime = 998.00 maxtime = 998.00 tl 998.00 ml 0
71 0.002 -0.95 1t 1...Rxd2 2.Qxd2 Qxe4 {-80}
85 0.002 0.48 1t 1...Bxe3 2.fxe3 {0}
155 0.003 0.48 1. 1...Bxe3 2.fxe3 {0}
194 0.003 0.48 2t 1...Bxe3 2.fxe3 {0}
1055 0.006 0.48 2. 1...Bxe3 2.fxe3 {0}
2219 0.011 0.62 3t 1...Bxe3 2.fxe3 Kb8 3.a3 {0}
3549 0.014 0.62 3. 1...Bxe3 2.fxe3 Kb8 3.a3 {0}
7453 0.024 0.80 4t 1...Bxe3 2.fxe3 Qg5 3.Rae1 Kb8 {0}
14093 0.039 0.80 4. 1...Bxe3 2.fxe3 Qg5 3.Rae1 Kb8 {0}
33029 0.092 0.72 5t 1...Bxe3 2.fxe3 Qh6 3.Rfe1 Kb8 4.a3 {0}
79568 0.200 0.72 5. 1...Bxe3 2.fxe3 Qh6 3.Rfe1 Kb8 4.a3 {0}
114023 0.281 0.81 6t 1...Bxe3 2.fxe3 Qh6 3.Rfe1 Kb8 4.a3 Qg5 {0}
177172 0.420 0.81 6. 1...Bxe3 2.fxe3 Qh6 3.Rfe1 Kb8 4.a3 Qg5 {0}
327843 0.798 0.77 7t 1...Bxe3 2.fxe3 Kb8 3.Rae1 Rd6 4.Nf3 Re8H
5.Nd2H {0}
673032 1.494 0.77 7. 1...Bxe3 2.fxe3 Kb8 3.Rae1 Rd6 4.Nf3 Re8 5.Nd2
{0}
1314869 3.165 0.97 8t 1...Bxe3 2.fxe3 Qg5 3.Rfe1 Rd6 4.Kh1 Ng4 5.Nf1
Rhd8 {0}
1905069 4.366 0.97 8. 1...Bxe3 2.fxe3 Qg5 3.Rfe1 Rd6 4.Kh1 Ng4 5.Nf1
Rhd8 {0}
3439891 8.240 0.90 9t 1...Bxe3 2.fxe3 Qg5 3.Rfe1 Rd6 4.Bb5 a6 5.Ba4
Rhd8 6.Nc4H {0}
6079958 14.006 0.90 9. 1...Bxe3 2.fxe3 Qg5 3.Rfe1 Rd6 4.Bb5 a6 5.Ba4
Rhd8 6.Nc4 {0}
9241664 21.804 1.02 10t 1...Bxe3 2.fxe3 Qg5 3.Rfe1 Rd7 4.Bb5 c6 5.Bf1
Rhd8 6.Nc4 Kb8 {0}
15556107 35.656 1.02 10. 1...Bxe3 2.fxe3 Qg5 3.Rfe1 Rd7 4.Bb5 c6 5.Bf1
Rhd8 6.Nc4 Kb8 {0}
27200385 1:04.1 1.02 11t 1...Bxe3 2.fxe3 Qg5 3.Rfe1 Rd7 4.Bb5 c6 5.Bc4
Rhd8 6.Nb3 Bf3 7.Nc5 {HT} {0}
48013913 1:49.4 1.02 11. 1...Bxe3 2.fxe3 Qg5 3.Rfe1 Rd7 4.Bb5 c6 5.Bc4
Rhd8 6.Nb3 Bf3 7.Nc5 {HT} {0}
126068338 5:23.4 0.87 12t 1...Bxe3 2.fxe3 Kb8 3.Rae1 Rhe8 4.a3 Rd6 5.Rf5
Bg4 6.Rf2 Red8 7.Ref1 h6 {0}
211068163 8:45.4 0.87 12. 1...Bxe3 2.fxe3 Kb8 3.Rae1 Rhe8 4.a3 Rd6 5.Rf5
Bg4 6.Rf2 Red8 7.Ref1 h6 {0}
377491389 16:37.9 0.87 12f. 1...Bxe3 2.fxe3 Kb8 3.Rae1 Rhe8 4.a3 Rd6 5.Rf5
Bg4 6.Rf2 Red8 7.Ref1 h6 {0}
377491389 Nodes, 38.42% Leavenodes, 378251 Nodes/sec
291219157 eval, 40.44% score, 1389151509 genmoves, 18.53% captures le 301/368
ext: pawn 11440, rcp 1743797, chk 6132469, repchk 856027, null 36048, prune 3183
6055
htable: 297778687 store, 0 rejected, 369225461 probe, 23.4% f/p, 29.0% f/s
entries 2666664 age 0 renew 0
egtb probes 0, found 0 max_depth 43
solution not found
1 tested, 0 found, 0 mates
377491389 nodes, 145024671 leavenodes in 998.21 sec 378169 n/s
test nodes 377491389 win nodes 0 mate nodes 0
win time 0.00 mate time 0.00 av depth 12.000 (nm 12.000) maxdepth 43, tu 973
log(win_nodes) = 0.00000 log(win_time) = 0.00000
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