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Subject: Challenge to Deep Blue and any deepsearching prog

Author: Vincent Diepeveen

Date: 16:44:35 12/07/99


Hello to All studiers of the game of chess with a program,

Here a cool study which has next problems
  - some zugzwangs (black getting forced to move the queen)
  - the line(s) that win for white are forced till the end (singular)

7k/2q3pP/6P1/8/8/8/6Pp/2RR3K/w - -

black timeleft=666:40.00.00
 - = - = - = - k   ...       1    ...
 = - q - = - o O   ...       2    ...
 - = - = - = O =   ...       3    ...
 = - = - = - = -   ...       4    ...
 - = - = - = - =   ...       5    ...
 = - = - = - = -   ...       6    ...
 - = - = - = O o   ...       7    ...
 = - R R = - = K   ...       8    ...
white timeleft=666:40.00.00
white to move

I estimated that for a program doing checks in qsearch
and NOT having any extension and not having hashtable luck
the solution is 22 ply to see. 23 ply otherwise.

the solution is not found yet by my program (running
at a dual celeron 550 with 300mb hash now under linux of
cuz), as it's PVs are crap so far and it gives black the
chance to sac queen somewhere near end of pv.

I'm not a dreamer so i'm not gonna ask for an output
of deep blue junior, but i love to see whether other
progs make a chance here.

It's adviced to use KRPKP and KPKP KPK
egtb at least for this position, that should produce when
seeing the good lines a score at HUGE depths of mate in XXX
or something of over +15.0

I'm not using them with diep here, so perhaps diep never finds it...
...i just pray for transposition luck right now... ...right now
score is +7.7 which is by accident also the score for KRP KP here
but i guess it didn't see it yet.

Vincent





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