Is this a world record branching factor

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Topic Rybka Support & Discussion / Rybka Discussion / Is this a world record branching factor

By dragon49 (****)

Date 2010-09-22 02:21

Ply 27: 01:43:39
Ply 28: 12:47:39

I seem to remember that a higher plies (>32) I have seen Rybka spend more than 24 hours considering a move in the middle of a ply, but for me at >30 plies, this is the most extreme branching that I can remember. Does anybody have any more extreme examples.

By Mark

Date 2010-09-22 02:44

Here's an extreme example from wac042. Not Rybka, though! :smile:

(no hash tables and just getting started on move ordering...)

depth     nodes    time eval  pc
----------------------------------------------------------------------------
   6    2436823    3.16  328 Bb4a5 Bg7f8 Qa3c3 Bf8b4 Ba5b6 Bb4c3 
   7   61594579   80.40  325 Bb4a5 Bg7f8 Qa3c3 Bf8b4 Ba5b4 Nd7e5  e3e4

By dragon49 (****)

Date 2010-09-22 03:01

Good luck with your engine!

What language and compiler are you using?

By Mark

Date 2010-09-22 10:22

Thanks! I'm writing it in c and compiling with Microsoft Visual C++ 2010 Express. It's been a lot of fun so far! Except for a course in basic that I took in college in the mid-1970's, I don't have any formal programming education, so it takes awhile...

By Uly

Date 2010-09-22 08:13

I recall someone reporting a branching factor of >68 for Rybka 3 at some point, but such big branching factors are normal for failing moves (I think that was a reason for Vas to overlook the MultiPV bug, he thought the huge branching factor was related to a deep failing move, or something).

Topic Rybka Support & Discussion / Rybka Discussion / Is this a world record branching factor