#bym小本本节选# 最近和娃玩 connect four （有译作“四连棋”，类似五子棋）-- 这是一种变化简单的棋类游戏，但是也有各种套路，人脑不能完全掌握。但是对于计算机是简单的（双方都最佳走法，先行者必胜。）这引发了 bro 对类似问题的思考：
- what does it mean to play a perfect game in Connect Four? in 围棋？
- what does it mean to play a perfect game in weiqi, but with computation constraints?
- 走迷宫也是 tree search, 和下棋的同异何在? note: there is no pattern to recognize in 迷宫