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Edax

Edax is a very strong othello program. Its main features are:

  • fast bitboard based & multithreaded engine.
  • accurate midgame-evaluation function.
  • opening book learning capability.
  • text based rich interface.
  • multi-protocol support to connect to graphical interfaces or play on Internet (GGS).
  • multi-OS support to run under MS-Windows, Linux and Mac OS X.

Installation

From the release section of github, you must 7unzip both an executable of your favorite OS, and the evaluation weights (data/eval.dat) in the same directory. Only 64 bit executable with popcount support are provided.

Run

local

mkdir -p bin
cd src

# e.g. OS X sample
make pgo-build ARCH=armv8-5a COMP=clang OS=osx
cd ..
./bin/mEdax

docker

docker build . -t edax
docker run --name "edax" -v "$(pwd)/:/home/edax/" -it edax

cd /home/edax/
mkdir -p bin
cd src
make build ARCH=x86-64-v3 COMP=clang OS=linux

cd ..
curl -OL https://github.com/abulmo/edax-reversi/releases/download/v4.4/eval.7z # e.g. use v4.4 eval.dat
7z x eval.7z

./bin/lEdax-x64

Document

cd src
doxygen
open ../doc/html/index.html

version 4.6

version 4.6 is an evolution of version 4.4 that tried to incorporate changes made by Toshihiko Okuhara in version 4.5.3 and :

  • keep the code encapsulated: I revert many pieces of code from version 4.5.3 with manually inlined code.
  • remove assembly code (intrinsics are good enough)
  • make some changes easily reversible with a macro switch (USE_SIMD, USE_SOLID, etc.)
  • remove buggy code and/or buggy file path.
  • disable code (#if 0) that I found too slow on my cpu.
  • make soft CRC32c behave the same as the hardware CRC32c (version 4.5.3 is buggy here).
  • the code switch from c99 to c17 and use stdatomic.h threads.h (if available) stdalign.h
  • remove bench.c: most of the functions get optimized out and could not be measured.
  • support only 64 bit OSes.
  • this version is still in development and may change before I release it.

makefile

the major change is that the ARCH options are no longer the same, as they are too many possible options to enable avx2, avx512, CRC32c, etc. Use make -help for a list of options.