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Fizbo 2 has been released, and can be downloaded from https://sites.google.com/site/fizbochessengine/ Here are release notes: 1. minor bug fixes: fixed a bug that occasionally crashed the engine, mostly running on multiple CPU cores. That is the bug that crashed Fizbo twice in TCEC10 . 2. minor chan...

I tried this earlier this year; i tried using 4 stages, 8 stages and even 16 stages (you can fit 16 16-bit values into one AVX variable that you can operate on in one instruction, so up to 16 stages can be accommodated with virtually no performance penalty). This significantly reduces variance of th...

i use insertion sort - for short, partially sorted lists it is fast, with O(N) performance in best case. I tried using selection sort instead at some point, and saw worse performance.

US already switched to summer time, so now 9pm in Amsterdam is 4pm (not 3pm) in Boston.

somebody else had a similar problem, where Fizbo 1.8 was identified as a virus by windows defender (and Fizbo 1.9 reuses most of the code, so may have the same exact problem). I don't know why this happens; my best guess is that a portion of my code accidentally matches a portion of code of some vir...

more on "info string I have a big problem": now i understand why you get this message - you search to a fixed depth, so time parameters are not defined, and it looks like a timeout. I never search to a fixed depth, so i never get this message anymore. So just ignore it, it is informational only and ...

that was fast - thanks!

i put this message for diagnostic purposes (and totally forgot about it). It should be printed in case of timeout, and should not impact anything. So just ignore it, and i will take it out in the next version.

Youri.

Fizbo 1.9 has just been released. It can be downloaded from https://sites.google.com/site/fizbochessengine/ Here are changes from version 1.8: 1. minor bug fixes: Fizbo 1.8 sometimes crashed when using 6-piece syzygy tables; that should not happen any more. 2. minor changes to search. 3. extensive c...

i absolutely agree: any sort of test suites are not good enough to measure small to medium changes. The only reliable way is through extensive game play. Yes, that takes a lot of time, but there really is no alternative to it.