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Stockfish and chess variants [Subject Thread] [Add Response]
Aurelian Florea wrote on Wed, Nov 2, 2022 10:10 AM UTC:

I have seen below a discussion involving stockfish and chess variants. I did not knew that there is a connection. Can someone explain me please what variants, stockfish can play!


Daphne Snowmoon wrote on Wed, Nov 2, 2022 10:28 AM UTC in reply to Aurelian Florea from 10:10 AM:

Aurelian Florea //

https://github.com/ianfab/Fairy-Stockfish/releases/tag/fairy_sf_14

I downloaded Fairy Stockfish from assets here.

https://discord.gg/aPs8RKr

It might be quicker to ask on this channel how to use Fairy Stockfish.


Aurelian Florea wrote on Wed, Nov 2, 2022 11:39 AM UTC in reply to Daphne Snowmoon from 10:28 AM:

Thanks, Daphne! Have you any idea about what fairy pieces it recognizes?


Daphne Snowmoon wrote on Wed, Nov 2, 2022 11:50 AM UTC in reply to Aurelian Florea from 11:39 AM:

https://github.com/ianfab/Fairy-Stockfish/blob/master/src/variants.ini

It might be good to take a look at this. Variants created by individuals are implemented by this definition.

And I use Fairy Stockfish via WinBoard (XBoard), I'll give you the file if you need it.


Aurelian Florea wrote on Thu, Nov 3, 2022 11:04 AM UTC in reply to Daphne Snowmoon from Wed Nov 2 11:50 AM:

So it seems stockfish cannot do bent riders!


H. G. Muller wrote on Thu, Nov 3, 2022 11:26 AM UTC in reply to Aurelian Florea from 11:04 AM:

This is what I expected. Stockfish uses bitboards, and the standard algortithms for bitboards are very much specialized for sliding along diagonals and orthogonals. Fast algorithms for check detection also often assume that moves are reversible which is also not true for bent riders.


Aurelian Florea wrote on Thu, Nov 3, 2022 12:00 PM UTC in reply to H. G. Muller from 11:26 AM:

Thanks, HG!


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