TalkChess.com

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.

Please report any bugs to me at: drd@mit.edu

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.

much thanks to you, larry, & jim! taking it for a spin now.

Thanks, Don and Jim.

Will there be Komodo for Iphone?

seems minor but something odd going on with this position

[D] r1b2bk1/1p1n1Qp1/p2p3p/3P2q1/P1B2R2/8/1PP3PP/R6K b - - 0 18

in mpv the display is

Analysis by Komodo64 1.3b1 JA:

1. -+ (-#1992): 18...Kh7 19.Bd3+ Qf5 20.Qxf5+ g6 21.Qxg6+ Kh8 22.Qh7#
2. +- (4.13): 18...Kh8 19.Re1 b5 20.h4 Qg3 21.Qxf8+ Nxf8 22.Rxf8+ Kh7 23.Bd3+ Qxd3 24.cxd3 Bb7 25.Rxa8 Bxa8 26.Re6 Bxd5 27.Rxd6 Bb7 28.Rb6 Bc8 29.axb5 axb5 30.Rxb5 Kg6 31.Rc5 Bf5 32.d4 Kf6 33.Kh2 g5 34.Rc6+ Kg7 35.hxg5 hxg5 36.b4 Be4 37.b5 Kf7 38.Kg3 Bd5 39.Rd6 Be4 40.b6


seems to be a problem w/ move to mate + priority (obv Kh7 mating shouldn't be listed as best move)

Hi,
I see no bugs till now here under following conditions:
eng-eng
40/20
ponder off
resign off
nunn startpositions
Shredder GUI

Now starting some games with a GUI opening book

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

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.

bhlangonijr wrote:

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

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.

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.

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.

Don, is there any reason for not generating underpromotions all the time?
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.

Houdini wrote:

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.

Don, is there any reason for not generating underpromotions all the time?
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.

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?

The total slowdown amortized over all positions is probably very small.

I probably should take another look at this. I think I could at least include under-promotions at deep levels without any substantial impact.

Does Houdini include all underpromotions in the main search as well as in the quies or do you have restrictions?