Solution - Chess for players who are not super strong

[tannenba]

I really like playing chess on my jail-broken Kindle
using Gnome Chess from:
https://github.com/crazy-electron/Gn...indle/releases
(also available for easy install via the KindleForge package manager)

The above ships with 2 engines, Stockfish and GNU Chess. Both
engines are very strong. No matter what settings you use in
the engines.conf file, Stockfish will not play weaker than
~1350 ELO and GNU Chess will not play below ~1150 ELO. This is
very tough for a casual player playing a casual game.

So I compiled up Fairy-Stockfish, which can be used as a drop-in replacement.
Amongst its many changes, Fairy-Stockfish can play all the way down to a
beginner level of 500 ELO.

So in the tar file attached to this post are three files:

** README.txt : this file

** stockfish : This is Fairy-Stockfish compiled as a standalone statically
linked binary that should work on practically any Kindle (armel or armhf).
I say "should work", because I only have a armhf Kindle, so that is what
I tested with. Use this binary in place of the stockfish binary installed by
GnomeGames4Kindle by copying it to you Kindle at:
/extensions/gnomegames/bin/armhf/stockfish
and/or
/extensions/gnomegames/bin/armel/stockfish

** engines.conf : This is a configuration file read by GNOME Chess, modified
to play at easier levels when using Fairy-Stockfish. Take a look at it, it
is easy to modify (although the syntax is picky). Change the last number
on the "UCI_Elo value" lines to adjust strength of play; I currently have it
set so when selecting engine Stockfish in the game, Easy = 500 ELO,
Normal = 800 ELO, and Hard = 1100 ELO. Copy this file to your Kindle at:
/extensions/gnomegames/share/glchess/engines.conf

How I Compiled Fariy-Stockfish

If you want to cross-compile Fairy-Stockfish yourself, it is easy to do
using Zig. This is what I did using Docker on my Intel Windows 10 desktop
(should be easy to do with any machine that has Docker):

C:\Kindle>docker run -it --rm -v "%cd%":/output ubuntu:latest bash
# apt update && DEBIAN_FRONTEND=noninteractive apt install -y make git zig
# cd ~
# git clone --depth 1 -c advice.detachedHead=false https://github.com/fairy-stockfish/Fairy-Stockfish.git
# cd Fairy-Stockfish/src
# make -j build ARCH=general-32 COMP=clang nnue=no CXX="zig c++ -target arm-linux-musleabi -w -Wno-everything -Wl,-s"
# cp stockfish /output/.