Moderators: bob, hgm, Harvey Williamson
Jim Ablett wrote:
Komodo 1.3 beta 1 test by Don Dailey & Larry Kaufman
Windows/Linux 64/32 Intel p.g.o
This is an unoffical beta test version.
What's new
Improved evaluation.
Improved search.
30 ELO stronger. (conservative estimate)
Download:
http://www.mediafire.com/?cb3do6a9i69sqag
Mirror:
http://good.net/_C6znfW9ms
Jim.
I heard that Komodo prune minor promotions with exception of the knight promotion when it is giving a check. Anyways, I didn't know it was pruning at root.SzG wrote:Thank you all for the engine!
It seems it cannot promote to bishop. At least in this position it wants to promote to queen with a score of 0.
[D]8/5k2/4p3/4Pp1p/5P1P/3Rn2K/6p1/8 b - - bm g1=B
Komodo considers all underpromotions at the root I thought too. Perhaps I rigged the generator to ignore everything but the knight, I will have to check.bhlangonijr wrote:I heard that Komodo prune minor promotions with exception of the knight promotion when it is giving a check. Anyways, I didn't know it was pruning at root.SzG wrote:Thank you all for the engine!
It seems it cannot promote to bishop. At least in this position it wants to promote to queen with a score of 0.
[D]8/5k2/4p3/4Pp1p/5P1P/3Rn2K/6p1/8 b - - bm g1=B
Don, is there any reason for not generating underpromotions all the time?Don wrote:Komodo considers all underpromotions at the root I thought too. Perhaps I rigged the generator to ignore everything but the knight, I will have to check.
But you are right about knight under-promotions in general, they are always considered if they give check and this covers the majority of cases (but not all of them) where it's best to promote to knight.
In promotion rich positions looking at several extra moves that are almost certainly not best can slow the program down. Have you found that not to be the case?Houdini wrote:Don, is there any reason for not generating underpromotions all the time?Don wrote:Komodo considers all underpromotions at the root I thought too. Perhaps I rigged the generator to ignore everything but the knight, I will have to check.
But you are right about knight under-promotions in general, they are always considered if they give check and this covers the majority of cases (but not all of them) where it's best to promote to knight.
The performance hit must be absolutely marginal (< 0.1 %), and even if in practical play underpromotions are very rare, people kind of expect that a 2800+ engine handles them correctly.
