I sure that developing a game would not require a license to do, so you could create many games or even gambling games as you like as long as you can or you have the knowledge to do it. Also as long as the game is involving money in the game like a bet it is already gambling in your case even if it is only for 1v1 but still involving money like a bet so I think you can call it gambling.

Good luck to your project you might only need them licensed if you are going to open a gambling website. So if you are planning to do that you might need a bit of research in your place about that.