This is a feature that comes within Skybox 3D, it will allow you to see, as its name says, a summary of the actions happening in a specific round. Just press “R” to toggle it on.
When in the Round Summary, you will see the list of played rounds in a game plus some iconography which will help you understand in a much simpler way what happened on those rounds.

This icon indicates that the T team has eliminated all the players in the CT team.



This icon indicates that the CT team has eliminated all the players in the T Team.



This icon indicates that the T team has won the round by making the C4 explode.



This icon indicates that the Ct team has won the round by defusing the C4.




This feature will help you go through all the action without having to look at the game itself, just by seeing the map, the kills, and the iconography you will be able to understand what happened in a specific round. Therefore, it would help you to analyze games much better since you can go through the rounds of your interest and when you’re all set, you can press the replay button to go just to that round on Skybox 3D.
Try playing around with it and see the game from a new perspective.