Hi Ravi !
You can play thematic games in "online chess" . (I don't think that option is there in live chess)
In "Start New Game" click on "Show more options" , you can select the starting opening position of your choice there . Hope I answered your question ..
Regards ,
Ash

I want to play a number of games on 1.e4,c5
I heard about thematic options but not familiar with them on the site. Can anyone help please on how to start a thematic game.
Thanks ,
Ravi