For me it's less intuitive than a tree, but you can use a matrix to express all possible strategies of a two-player sequential game. This can help you visualize

For me it's less intuitive than a tree, but you can use a matrix to express all possible strategies of a two-player sequential game. This can help you visualize credible vs. noncredible threats from the second player. Ultimately I think the tree is more helpful in solving it visually, though.