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MOBMAT wrote: ↑Sat Sep 19, 2020 3:50 pm I use the Polyglot random numbers for my Zobrist hashing for the following reasons:

1. they already exist, why reinvent the wheel.
2. the position hash will always match what the polyglot books require for lookup, so there isn't any further regeneration of another hash needed to probe the book.
3. it saves memory space.
4. it provides a way to validate the hash algorithm. make moves from the starting position and then probe the book. if you get the correct hit, you know both the hashing and probing are working.

here is the link to Harm's write up...
http://hgm.nubati.net/book_format.html
I created a C++ class to wrap everything into a nice tidy package.

1. they already exist, why reinvent the wheel.

I created a C++ class to wrap everything into a nice tidy package.

maksimKorzh wrote: ↑Mon Sep 21, 2020 2:01 am

MOBMAT wrote: ↑Sat Sep 19, 2020 3:50 pm I use the Polyglot random numbers for my Zobrist hashing for the following reasons:

1. they already exist, why reinvent the wheel.
2. the position hash will always match what the polyglot books require for lookup, so there isn't any further regeneration of another hash needed to probe the book.
3. it saves memory space.
4. it provides a way to validate the hash algorithm. make moves from the starting position and then probe the book. if you get the correct hit, you know both the hashing and probing are working.

here is the link to Harm's write up...
http://hgm.nubati.net/book_format.html
I created a C++ class to wrap everything into a nice tidy package.

1. they already exist, why reinvent the wheel.

Cool. Didn't know about that, thanks.

I created a C++ class to wrap everything into a nice tidy package.

C++ is rocket science for me...
I'm forced to use OOP in my freelance jobs, so at least in chess programming I can go for good old plain functional C

MOBMAT wrote: ↑Mon Sep 21, 2020 3:26 pm

maksimKorzh wrote: ↑Mon Sep 21, 2020 2:01 am

MOBMAT wrote: ↑Sat Sep 19, 2020 3:50 pm I use the Polyglot random numbers for my Zobrist hashing for the following reasons:

1. they already exist, why reinvent the wheel.
2. the position hash will always match what the polyglot books require for lookup, so there isn't any further regeneration of another hash needed to probe the book.
3. it saves memory space.
4. it provides a way to validate the hash algorithm. make moves from the starting position and then probe the book. if you get the correct hit, you know both the hashing and probing are working.

here is the link to Harm's write up...
http://hgm.nubati.net/book_format.html
I created a C++ class to wrap everything into a nice tidy package.

1. they already exist, why reinvent the wheel.

Cool. Didn't know about that, thanks.

I created a C++ class to wrap everything into a nice tidy package.

C++ is rocket science for me...
I'm forced to use OOP in my freelance jobs, so at least in chess programming I can go for good old plain functional C

Thanks for clarification

I code in what I call C+. No, not C or C++, but C+.
That refers to using features of both languages, mostly being what C developers really wanted in a OO language, such as classes. The language should be used to support the requirements, not the other way around. I recall once a conversation with a colleague who used the following example. If you are writing code to send rockets into space, you aren't going to chose a language that at any time, can arbitrarily decide when it is going to do memory garbage collection. But don't get me started... LOL

Knowing C makes it easy to understand what C++ is doing. If you learn C++ first, a lot of the underlying processes are glossed over. I like to know what my code is doing.