add 4 io

hc

2023-08-21 ef9e1ccebba20d2e3859126411166909a383f483

1
2
# sha256 locally computed
sha256 3c425c0264f253fc5cc2ba969abe667d77703c728770bd4b23c456cbe5e082ef  gnuchess-6.2.4.tar.gz