Author: Dieter Buerssner
Date: 12:28:17 10/22/03
Go up one level in this thread
On October 22, 2003 at 14:33:26, Tim Foden wrote:
>On October 22, 2003 at 10:44:36, Dieter Buerssner wrote:
>
>>Only tried with null move. After few corrections Yace found in 87 in 1s, 98 in 5
>>s, 92 needed 8 s and 71 10 s.
>
>Ah... it took me a while to decifer this Deiter... I couldn't figure out why
>you were getting fewer solution in more time :)
Oops, sorry for the too sloppy (wrong) formulation
>in 1 second Yace found 87 solutions
>in 5 seconds Yace found 98 solutions
>additionally, the solution to number 92 needed 8 seconds and
> the solution to number 71 needed 10 seconds.
Yes.
>6b1/4Kpk1/5r2/8/3B2P1/7R/8/8 w - - bm Bxf6+; id "Loyd-095; #7";
>
>Line 006: Test [Bxf6+]...
> Game stage: Endgame
> Current eval: 0.209
> Ply Time Score Nodes Principal variation
> 9 0.531 +Mate07 1038732 Bxf6+ Kg6 2. Rh5 Bh7 3. Rg5+ Kh6 4. Kxf7 Bg6+ 5.
> Rxg6+ Kh7 6. Bh4 Kh8 7. Rh6# {ht}
> 9 0.821 +Mate05 1671852 Rh6 Kxh6 2. Kxf6 Kh7 3. g5 Kh8 4. g6 fxg6 5. Kxg6#
And another, even bigger oops :-( Thanks for pointing out my error (also, to
Stephen and Franz). The original epd record was correct, and I made it wrong ...
Sorry.
A bug in my engine. For those who are curios - it has to do with the interior
node recognition. The concrete case KBKB: Yace considers this as draw, besides
some specific conditions, that are coded by some rules. I am 100% sure, that I
checked all KBKB positions against Nalimov-TBs once, and got no wrong draw. But
a error must have slipped in again. Now I actually get 244 wrong draws (many are
mirror positions of each other - my testing code does by purpose test all
positions, so that it would also find errors in the "mirroring code"). Probably
I wanted to make the rules tighter, and forgot to take those tighter but wrong
rules out again.
Will be fixed ASAP. I will also rerun the whole tests of the interior
recognizer/bitbase code.
Cheers,
Dieter
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