Hello Codeforces community, A newbie here.My name is Sayan Chaudhuri and I am from India. Although as you can see my rating is low, I particularly face high difficulty while solving problems based on games. Like problems of DIv 3C or Div2B which often are problems based on games, I find it extremely troubling to solve them. I just get bamboozled when I find the term "optimally" as it does not occur to me, what an optimal move could be...So, how do you guys approach these problems on games.. If anyone can give me some intution or any sort of other help that may help me to overcome this difficulty. round 668 div2 problem B Sequential Nim- this problem is an example. I am not just able to understand how to solve it.... Thanking you in advance...