Koivisto 2.0

[Luecx]

A while ago, Kim Kåhre and I (Finn Eggers) have published the first version of our engine Koivisto. We have made some very fast progress before that release and we have also had a lot of progress in the last couple of days. That's why we want to publish Koivisto 2.0 today. Besides adding Lazy SMP which scales nicely up to 8 threads and beyond, we fixed a few bugs, improved the speed, and many more things as listed below:

...

The easiest way to contact us would be our Discord: (Finn) Luecx#0540 or (Kim) ChiefWiggum#1154

Whoa..Whoa... just a minute my friend...no windows binaries have been produced on v1.0 so far (or 2.0)... and windows searches on Koivisto bring up absolutely nothing.. so who is doing the testing...we need windows binaries for popcont and npopcount...Thank you AR

You can try those on your own risk from here (bmi2 completely untested - I can only run the 'old' ones on my hardware = no popcnt/core2)
(I noticed that on my slow old hardware Koivisto 2 runs now at around 740kn/s compared to around 600kn/s for version 1 - checked for startpos)
https://rwbc-chess.de/download.htm

We should perhaps adjust the makefile for those type of hardwares. On my hardware, Koivisto gets about 2.5Mnps there.

How fast is e.g. vanilla SF 11 for your hardware from startpos?
Let's say around depth 25-30, here it is around 640 kn/s.

The 64-bit version without bmi2 or sth (stockfish_20011801_x64) gets about 1.8 Mnps

[Guenther]

How fast is e.g. vanilla SF 11 for your hardware from startpos?
Let's say around depth 25-30, here it is around 640 kn/s.

The 64-bit version without bmi2 or sth (stockfish_20011801_x64) gets about 1.8 Mnps

(Edit: With 'vanilla' I meant the available compile for your hardware)
You should try the fastest compile of SF11 for your hardware, except you don't have used an optimized compile of your Koivisto yourself,
otherwise the comparison is not too precise, so you should try 'modern' or 'bmi2'.

Code: Select all

SF11   Koi2
2.5  / 1.8  = 1.389
0.74 / 0.64 = 1.156

[Luecx]

How fast is e.g. vanilla SF 11 for your hardware from startpos?
Let's say around depth 25-30, here it is around 640 kn/s.

The 64-bit version without bmi2 or sth (stockfish_20011801_x64) gets about 1.8 Mnps

(Edit: With 'vanilla' I meant the available compile for your hardware)
You should try the fastest compile of SF11 for your hardware, except you don't have used an optimized compile of your Koivisto yourself,
otherwise the comparison is not too precise, so you should try 'modern' or 'bmi2'.

Code: Select all

SF11   Koi2
2.5  / 1.8  = 1.389
0.74 / 0.64 = 1.156

Oh my bad! SF modern gets about 2Mnps on my hardware. So that would be a ratio of 1.2. I guess thats alright

[Sylwy]

K 2.0 x64 BMI2 on my machine:

[Luecx]

K 2.0 x64 BMI2 on my machine:

That looks about right.

[Guenther]

K 2.0 x64 BMI2 on my machine:

My compilation I guess? So it seems it is fine.

[Luecx]

K 2.0 x64 BMI2 on my machine:

My compilation I guess? So it seems it is fine.

Yeah I guess its fine
As long as its slightly faster than most other engines, it should be fine

[Sylwy]

My compilation I guess? So it seems it is fine.

YES ! THANK YOU ! A fine engine !
More infos:
https://www.chessprogramming.org/Koivisto

[Luecx]

My compilation I guess? So it seems it is fine.

YES ! THANK YOU ! A fine engine !
More infos:
https://www.chessprogramming.org/Koivisto

Wow, nice! Thank you very much It would also be really nice if Kim Kåhre would be added as an author because we both did the same amount of work

Furthermore, we only do check extensions when SEE > 0.

[supersharp77]

My compilation I guess? So it seems it is fine.

YES ! THANK YOU ! A fine engine !
More infos:
https://www.chessprogramming.org/Koivisto

v1.0 & v2.0

https://rwbc-chess.de/Downloads/Engines/Koivisto1+2.7z