For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:onlyJak0b:Unstable/openSUSE_Tumbleweed/home:onlyJak0b:Unstable.repo
zypper refresh
zypper install stockfish
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:onlyJak0b:Unstable/15.5/home:onlyJak0b:Unstable.repo
zypper refresh
zypper install stockfish
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:onlyJak0b:Unstable/15.4/home:onlyJak0b:Unstable.repo
zypper refresh
zypper install stockfish