There are a few strategy games with a large published literature expounding the “theory” or advanced strategies of the game. Go, chess (and related games such as Chinese chess and shogi), bridge, poker, and blackjack come to mind. I know of a couple of other games with a smaller literature, such as checkers, backgammon, and Scrabble, and a few more games about which just one or two notable “theory” books seem to have been written, such as Othello, Hex, Connect 4, Dots and Boxes, and Nine Men’s Morris.
Are there other games with a small but substantive amount of published theory? To set some parameters, I’m interested only in games for which there exists at least one full-length book devoted entirely (or almost entirely) to advanced strategies for the game. So for example, for Monopoly, I’m only aware of The Monopoly Book by Maxine Brady, which doesn’t quite meet the threshold I’m looking for, because it devotes a lot of space to history and basic explanation of the rules, and does not delve that deeply into advanced strategy (but if there are other, more advanced books on Monopoly, then I’d love to hear about them).