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Subject: Re: How long does it take your engine to find the mate in 4?

Author: Stan Arts

Date: 10:15:31 12/31/03

Go up one level in this thread


Hello

Neurosis 1.6 on a P3-550 with 48MB hash.

Legal moves: 57   Static score: -264
Ply Score Time     Nodes      Best move and expected line
------------------------------------------------------------
2   -12   5        2828       Bxd7+ Qxd7 Rf8+ Rxf8 Rxf8+ Kxf8
3   95    11       3788       Bxd7+ Qxd7 Rf8+ Rxf8 Rxf8+ Kxf8 Qxd7
4   95    66       47029      Bxd7+ Qxd7 Rf8+ Rxf8 Rxf8+ Kxf8 Qxd7
5   95    297      225882     Bxd7+ Qxd7 Rf8+ Rxf8 Rxf8+ Kxf8 Qxd7
5   96    362      285154     Re1 < + > Qb8 cxd3 Qe5 Rf8+
5   357   395      322339     Re1 < + > Qa5 Bxd7+ Kd8 Qxe7+
5   437   417      340859     Re1 Qb6+ Qxb6 axb6 Re1xe7+ Kd8 Rxd7+ Ke8 cxd3
5   438   730      602556     Kh1 < + > g5 Rxh7 Rg8 Bxd7+
5   694   769      634206     Kh1 < + > a6 Rxg7 Qa5 Rxe7+
5   9993  818      672432     Kh1 <M4> a6 Rxg7 Rf8 Rxf8+ Kxf8 Qf7+
6   9993  1554     1255045    Kh1 <M4> a6 Rxg7 Rf8 Rxf8+ Kxf8 Qf7+
7   9993  3059     2421708    Kh1 <M4> a6 Rxg7 Rf8 Rxf8+ Kxf8 Qf7+
Total nodes:4310286 n/sec:78468  (Q-nodes:94453 max depth:15)

Happy new year,
Stan


>[D]r2qk2r/pp1nbRpp/4Q3/1B6/8/3p4/PPP3PP/5RK1 w kq - 0 17
>
>I came across this position in a blitz game tonight and missed the mate (playing
>Rxg7 instead).  My engine (Bogo) takes a full a minute to see the mate:
>
>ply |   score |    time |     nodes |    qnodes | line
>  1 |   -1.20 |    0.00 |        63 |       120 | cxd3
>  2+|   -0.70 |    0.01 |       211 |      2770 | Re1
>  2 |   -0.18 |    0.00 |       294 |      3582 | Re1 dxc2
>  3+|    0.32 |    0.02 |      1382 |      6644 | Re1
>  3 |    1.12 |    0.01 |      2015 |      8505 | Re1 d2 Qxe7+ Qxe7
>  4 |    1.12 |    0.02 |      2574 |     11943 | Re1 d2 Qxe7+ Qxe7
>  5+|    1.62 |    0.10 |     12127 |     29661 | Re1
>  5 |    4.99 |    0.16 |     27376 |     57157 | Re1 Qb6+ Qxb6 axb6 Rexe7+
>                                                  Kd8 Rxd7+ Kc8
>  6 |    4.99 |    0.11 |     39122 |     80765 | Re1 Qb6+ Qxb6 axb6 Rexe7+
>                                                  Kd8 Rxd7+ Kc8
>  7 |    5.36 |    1.68 |    227701 |    386042 | Re1 Qb6+ Qxb6 axb6 Rexe7+
>                                                  Kd8 Rxd7+ Kc8 Rc7+ Kd8 Rfd7+
>                                                  Ke8
>  8 |    5.36 |    1.21 |    373651 |    620391 | Re1 Qb6+ Qxb6 axb6 Rexe7+
>                                                  Kd8 Rxd7+ Kc8 Rc7+ Kd8 Rfd7+
>                                                  Ke8
>  9+|    5.86 |   15.05 |   2168181 |   3291189 | Kh1
>  9 |   Mat 4 |   41.57 |   7808070 |  11246013 | Kh1 dxc2 Rxg7 Rf8 Rxf8+
>                                                  Kxf8 Qf7#



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