ROOK SACRIFICE : A win and a bad loss

Here I will be posting two games played by me on a free internet server, with time control of 15 mins with 10 seconds increment.

In both the games I was in a better position before and after the Rook sacrifice. But the results were different.

Game 1 : A loss in a good position, not because of the rook sacrifice, but because of poor continuation.

Game 2: A rook sacrifice, wins with force.