Pinning isn’t a rule, it’s just something that arises from other rules. Also, pinning can happen with pieces that don’t include a king, which means you can jus

Pinning isn’t a rule, it’s just something that arises from other rules. Also, pinning can happen with pieces that don’t include a king, which means you can just move out of the pin and expose whatever other piece. It’s just a chess tactic, not a rule. It’s like saying a chess skewer is a rule too.