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Subject: Re: Interesting Mate in 10

Author: Stan Arts

Date: 04:59:56 01/18/05

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On January 18, 2005 at 00:37:55, Rob Basham wrote:

>[D]rq2r2k/b4pp1/2R4p/p5N1/3nN3/1P6/PK2nPRP/3Q4 w - - 0 1
>
>Rxh6+ mates!
>
>Junior 5 will ann. a mate in 10 in 14 sec.


Thanks for the position.

Lots of checks, Neurosis finds Rxh6+ instantly and announces mate in 10 on
depth 11. It finds a shorter mate in 9 one depth later.

P3-550 48mb hash.

Legal moves: 50   Static score: -327
Ply Score  Time     Nodes      Best move and expected line
------------------------------------------------------------
2   -210   5        588        Rxh6+ Kg8
3   -159   5        837        Rxh6+ Kg8 Nf6+ gxf6 Ne6+ Ng3
3   -102   5        965        Nxf7+ Kg8 Nxh6+ Kh8
4   -225   16       6099       Nxf7+ Kg8 Nf7-d6 Nxc6
4   435    22       6788       Rxh6+ Kg8 Nf6+ Kf8 Rh8+ Ke7 Rxe8+ Qxe8 Nxe8
5   435    33       11875      Rxh6+ Kg8 Nf6+ Kf8 Rh8+ Ke7 Rxe8+ Qxe8 Nxe8
6   435    88       34806      Rxh6+ Kg8 Nf6+ Kf8 Rh8+ Ke7 Rxe8+ Qxe8 Nxe8
7   435    225      113708     Rxh6+ Kg8 Nf6+ Kf8 Rh8+ Ke7 Rxe8+ Qxe8 Nxe8 Kxe8
8   437    807      481706     Rxh6+ Kg8 Nf6+ Kf8 Rh8+ Ke7 Rxe8+ Qxe8 Nxe8 Kxe8
a3
9   440    2900     1901027    Rxh6+ Kg8 Nf6+ Kf8 Rh8+ Ke7 Rxe8+ Qxe8 Nxe8 Kxe8
Nf3 Nxf3
10  476    8420     5295237    Rxh6+ < + > Kg8 Nf6+ Kf8 Nd5 Qxh2 Rh6xh2 Nxb3
Ra8-c8
10  556    8469     5317920    Rxh6+ < + > Kg8 Nf6+ Kf8 Nd5 Qxh2 Rh6xh2 Nxb3
Ra8-c8
10  796    8963     5554410    Rxh6+ < + > Kg8 Nf6+ Kf8 Nd5 Qxh2 Rh6xh2 Re8-b8
Qd3 g6
10  800    10754    6574563    Rxh6+ Kg8 Nf6+ Kf8 Nd5 Kg8 Qd3 Qxb3+ axb3 Nf5
Nf6+ gxf6 Nh7+ Nf5-g3 Nxf6+ Kg7
11  837    17471    11974682   Rxh6+ < + > Kg8 Nf6+ Kf8 Nd5 Kg8 Qd3 Qxb3+ axb3
Re7 Nxe7+
11  917    17477    11976420   Rxh6+ < + > Kg8 Nf6+ Kf8 Nd5 Kg8 Qd3 Qxb3+ axb3
Re3 fxe3
11  1157   17504    11985798   Rxh6+ < + > Kg8 Nf6+ Kf8 Nd5 Kg8 Qd3 Qxb3+ axb3
Re4 Nxe4
11  31980  24645    16697059   Rxh6+ <M10> Kg8 Nf6+ Kf8 Nd5 Kg8 Qd3 Qxb3+ axb3
Re4 Rh8+ Kxh8 Qh3+ Rh4 Qxh4+ Kg8
12  31982  78840    49032323   Rxh6+ <M9> Kg8 Nf6+ Kf8 Nd5 Kg8 Qd3 Qxb3+ axb3
Re4 Qxe4 g6 Rxg6+ fxg6 Qxg6+ Kf8 Nh7+
Total nodes:134390366 n/sec:72400  (q-nodes:8% max depth:31)

(I've increased my mate-values to 32000 minus distance. (was 10000 before.)
Because I'll start scoring in 1/200th of a pawn, with 16 bit values. So
scores will be 2x as big, and divided by 2 before showing them to the user,
but I'm working on that and here I'm not doing that yet.)

Greetings Stan




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