Sméagol: Hero of the Third Age

[Iaurhirwen]

Back to the original question posted by Nilpaurion Felagund:

Smeagol pledged to save the precious, obey the master of the precious, and never let him have it. Smeagol made a solemn promise to do this.

Now at the Cracks of Doom, I do not believe that Gollum was acting because he thought of the pledge and that he had a momentary change of heart or anything at that time. There, he was fully corrupted and only desired his precious back.

However, I do believe, that it was in this moment that fate/Eru/the Ring, made this moment the time when Smeagol's pledge was fulfilled. IMHO because Smeagol promised that he would:
[

never, never, to let him have it

and

to serve the master of the precious

whatever outside power, be it the ring, fate, or Eru, held him to his promise and caused the destruction of the ring, and subsequently, himself.