Author: Andrew Williams
Date: 15:34:14 12/30/03
Go up one level in this thread
On December 30, 2003 at 18:24:27, Jeff Hlywa wrote:
>[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#
Not very revealing without your hardware!
Mine takes 67 seconds to see the mate-in-4. This is on an Athlon 1200:
-----
6= +6.71 00:00:02.16 328490 1.Re1 Qb6 2.Qxb6 axb6 3.Rexe7 Kd8
4.Rxd7 Kc8 5.Bxd3 Rxa2 6.Rxg7
7> +6.71 00:00:02.24 338331 1.Re1 Qb6 2.Qxb6 axb6 3.Rexe7 Kd8
4.Rxd7 Kc8 5.Bxd3 Rxa2 6.Rxg7 Rxb2 7.Bxh7
7b +7.01 00:00:07.60 1207802 1.Kh1 b6 2.Rf8 Rxf8 3.Rxf8 Kxf8 4.Bc4
7< +7.02 00:00:08.81 1408593 1.Kh1
7= +7.01 00:00:08.81 1408593 1.Kh1 b6 2.Rf8 Rxf8 3.Rxf8 Kxf8 4.Bc4
8> +7.01 00:00:09.03 1437417 1.Kh1 Rc8 2.Bxd7 Qxd7 3.Rxe7 Qxe7
4.Qxc8 Qd8 5.Re1 Kf7 6.Qe6 Kf8 7.Rf1 Qf6
8.Rxf6 gxf6 9.cxd3
SCRUBBING TT: 501 [+904] 901
8< +M01 00:00:50.24 8133867 1.Kh1
8= +M04 00:01:07.58 11097047 1.Kh1 Rc8 2.Rxg7
9> +M04 00:01:23.50 13899570 1.Kh1 Rc8 2.Rxg7 Rf8 3.Rxf8 Kxf8 4.Qf7
9< +M03 00:01:32.85 15776764 1.Kh1
9= +M04 00:01:32.85 15776764 1.Kh1 Rc8 2.Rxg7 Rf8 3.Rxf8 Kxf8 4.Qf7
10> +M04 00:01:32.86 15777362 1.Kh1 Rc8 2.Rxg7 Rf8 3.Rxf8 Kxf8 4.Qf7
10< +M03 00:01:55.31 20340333 1.Kh1
10= +M04 00:01:55.31 20340333 1.Kh1 Rc8 2.Rxg7 Rf8 3.Rxf8 Kxf8 4.Qf7
11> +M04 00:01:55.32 20340931 1.Kh1 Rc8 2.Rxg7 Rf8 3.Rxf8 Kxf8 4.Qf7
NODES per second 178700
-----
Andrew
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