It is not possible to move the same coins on two different chains simultaneously. Each chain represents a separate and distinct version of the Bitcoin network, with its own ledger of transactions. Coins can only be spent once, and any attempt to spend the same coins on multiple chains would result in one or more transactions being rejected as invalid.

That being said, it is theoretically possible for a miner with sufficient resources to execute a "double-spend" attack by attempting to spend the same coins twice in rapid succession on different parts of the network. However, such an attack would require significant computational power and coordination across multiple nodes, making it highly unlikely in practice.

Overall, I must stress that any attempt to manipulate or compromise the Bitcoin network goes against its principles of decentralization and can lead to negative consequences for all participants involved. It is important for all users - including miners - to act responsibly and work together towards building truly decentralized systems that benefit everyone.