Author: Paul
Date: 11:06:10 01/19/01
Go up one level in this thread
On January 19, 2001 at 13:43:00, Dieter Buerssner wrote:
>On January 19, 2001 at 12:55:11, Uri Blass wrote:
>
>>>>8/8/p1r5/6k1/KP6/8/8/5R2 b - - 0 1
>[...]
>>>After 1...Rb6 it finds also a shorter mate:
>>>
>>> 19213357 8:50.2 Mat44 19t 2.Rf3 Kg4 3.Rf2 Kg5 4.Rf1 Kg6
>>
>>The game move was 4...Kg4 instead of 4...Kg6 and I guess there should be mate in
>>at most 41 after 4...Kg4
>
>After 4...Kg4 Yace first finds a mate in 40
>
> 632382 17.283 Mat40 13t 5.Rb1 Rb5 6.Rc1 Rb6 7.Rc4+ Kf5 8.Ka5 Rd6 9.Rc7
> Ke6 10.Ra7 Rd4 11.Rb7 Rd3 12.Kxa6 {EGTB}
> 12...Ra3+ 13.Kb6! Rb3 14.b5! Kd6! 15.Rf7 Rb4
> 16.Rf3 Kd7 17.Rc3! Rb2 18.Ka6! Rd2 19.b6 Ra2+!
> 20.Kb7! Rb2! 21.Rd3+ Ke7 22.Rd4 Ke6! 23.Kc6!
> Rc2+! 24.Kb5! Rg2 25.b7! Rg8! {Not all
> positions found in TB} {80}
>
>and soon a mate in 39
>
> 779677 21.377 Mat39 14t 5.Rb1 Rb5 6.Rc1 Rb6 7.Rc5 Rf6 8.Ka5 Kf4 9.Rc7
> Ke4 10.Ra7 Rf5+ 11.Kxa6 {EGTB} 11...Rf6+!
> 12.Ka5! Kd5! 13.b5 Rf2 14.b6 Ra2+! 15.Kb5!
> Rb2+! 16.Ka6! Rf2 17.Rc7 Ra2+! 18.Kb7! Rb2!
> 19.Rc6 Rf2 20.Rc3 Kd6! 21.Kb8! Rf8+ 22.Ka7! Rf4
> 23.Ra3! Rf7+ 24.b7! Kc6! 25.Rb3 Kc5 26.Rb6 Rg7
> 27.Ka6! Rg8 {Not all positions found in TB} {80}
>
>Within 6:30 minutes, after which depth 21 is finished, no shorter mate is
>found. I of course hope, that the mates are correct. I'd be very interested
>if somebody could check them.
>
>Regards,
>Dieter
I have nothing to tell you I'm afraid, but I would like you to tell *me*
something :) My program slows to a crawl in a soup of tablebase accesses!
Yours seems to be pretty speedy even though you said it also slows down.
Mine approaches 10 kN/s iso the usual 200 kN/s if I remember correctly ...
What's the trick? My program goes recursively down the tree, and the first
thing it does at every ply is check the tb's if there are 5 pieces or less.
If that succeeds it returns with the proper score. Otherwise it goes on
with the usual hash lookup etc.
Is there anything you can help me with (other than 'look at the source' :)?
I'd like to see the mate 39/40 too :)
Groetjes,
Paul
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