I will be sitting in two boring meetings and each one is several hours long. I do not need to participate in any way, nor is the information from the meeting useful to me. However, my presence is expected and I am not supposed to look at my books, phone, notebook, etc; but a quick glance at a piece of paper may be tolerable. Chess is my hobby and I am seeking advice on spending time mentally on chess during such meetings. By the way, right now I am unable to play blindfold chess.
Any ideas on how can I enjoy chess in my mind in such situations?