Moving opponent pieces is now forbidden.
tree26cf08be6038eadbf60f6efcb6e3d481e3d3f569
-rw-r--r-- 12 .gitignore
-rw-r--r-- 125 Rakefile
drwxr-xr-x - data
drwxr-xr-x - lib
drwxr-xr-x - test