Fizbo 1.3 released

[Graham Banks]

Fizbo version 1.3 has just been released. It can be downloaded from
https://sites.google.com/site/fizbochessengine/.

This release increases playing strength by around 80 ELO.

Here are release notes:
Changes in version 1.3, released November 11, 2014:
1. improved transposition table management
fixed a bug
reduce size of TT entry to 8 bytes
started using TT in Q search
added prefetch
better aging
2. added aspiration window
3. various small modifications to search and evaluation.

Single CPU improvement over version 1.2 is around +80 ELO (based on self-play at 1 sec/move).
Estimated strength with 1 CPU is 2,920 ELO. Strength with 4 CPUs should be around 3,010.

Thank you, Youri Matiounine.

[Werner]

Thanks Youri and Graham ,

I hope it is the correct version I downloaded:

xboard
Fizbo 1.2 started sucessfully

[Modern Times]

Yes - identifies itself as 1.2 here as well.

[Jamal Bubker]

Thank you Youri for keeping improving your chess engine

Thanks too Graham for reporting this new release !

[Graham Banks]

Thanks Youri and Graham ,

I hope it is the correct version I downloaded:

xboard
Fizbo 1.2 started sucessfully

Sorry, i forgot about version number that the engine reports.

I fixed it now - if you download the engine, it will now say that it is version 1.3.

Youri.

[Werner]

It is surely not only that. There is size difference as well and I have noticed slight difference in speed and a somewhat greater difference in evaluation.

Yes, and what about hash size - is it fixed or can I change it ?

[Dr.Wael Deeb]

It is surely not only that. There is size difference as well and I have noticed slight difference in speed and a somewhat greater difference in evaluation.

Yes, and what about hash size - is it fixed or can I change it ?

What size of a hash table we are talking about
Dr.D

[Werner]

Here is an example:
Werner

FEN: r1b2rk1/p3bp1p/4pp2/n3p3/1p1qNP2/1B4N1/PPP3PP/R2Q1R1K w - - 0 1

Fizbo13x64 (1): new compile
17 00:03 7.665.942 2.373.356 -0,28 d1g4 g8h8
18 00:07 17.869.826 2.441.233 -0,05 d1g4 g8h8
19 00:11 25.695.430 2.399.199 -0,06 d1g4 g8h8

Fizbo13x64: old compile
17 00:03 7.573.444 2.330.290 -0,41 d1g4 g8h8
18 00:07 17.726.112 2.421.600 +0,13 d1g4 g8h8
19 00:11 27.107.670 2.416.013 +0,13 d1g4 g8h8

[Dr.Wael Deeb]

It is surely not only that. There is size difference as well and I have noticed slight difference in speed and a somewhat greater difference in evaluation.

Yes, and what about hash size - is it fixed or can I change it ?

As far as I know hash size is 128 MB, cannot be changed.

Thanks,I wasn't aware of this and hence the failure to fire it up on my system....
Dr.D

[Werner]

Hi,
with the start command in Arena
cores 2
the engine runs with 2 CPUs

happy testing
Werner