When you are gaming you need to be focused, you need to ensure that you are not distracted, and you need to ensure that you are comfortable in your position. Not being in a comfortable state as you are sitting about can really become a huge factor in how well you play your game. A gamer in an uncomfortable position will always be worse off than one that is sitting with ease and comfort. It might be a little thing but it can start to compound and really affect your game play after a few rounds. Therefore it is very important that you have a chair that is comfortable enough for you to not have to worry about it being something that can affect your game play.
Now one very unusual chair that you would not expect to be good for gaming is the bean bag chair. Bean bag chairs might seem like something that is a bit lazy and that you would only really lie down on that seat rather than sit on it to gain some for advantage for tasks that require focus. However that could not be further from the truth. If you get a well made bean bag chair, your comfort, regardless of which position you sit in should not be a problem. You can move about in a bean bag chair and the chair itself will keep adjusting to your movement to ensure that you have support from all sides. Using bean bag chairs for gaming will greatly increase your comfort and will give you the ability to move about a little and not have to worry about finding a single position that is comfortable and then trying to recreate it every time you play. With a bean bag chair, every position you play in is comfortable.