The speaker imagines life as a chess game that can be rewound and played again. Nothing on the board is unfamiliar: every square has been stood on, every piece handled. A move leads to a consequence, then the game is reset and tried another way, over and over, "until we're sated." That word suggests the replaying is driven by appetite as much as curiosity, and the line "We're all gods around a chessboard" gives the speaker a strange, almost casual power.
The final stanza changes the tone. It brings in a familiar idea: if something is even slightly possible, however remote, it will happen somewhere in eternity. The speaker's control now looks less like freedom and more like a trap. If every outcome will eventually occur, then replaying doesn't really choose anything; it just works through what was always going to happen.
The mood is cool, reflective, and a little uneasy. It starts with confidence and ends in a quiet, dizzying sense of inevitability.