WallGo is a recently introduced strategic board game popularized by the 2025 Netflix series The Devil's Plan. Although played on a small 7 x 7 board, its combination of stone movement and wall placement yields high game-tree complexity and intricate strategic interactions. Despite its growing popularity, WallGo remains underexplored. This paper presents WallZero, an AlphaZero-based agent for the two-player WallGo setting. We introduce tailored action and feature designs to improve playing performance significantly. In the evaluation, WallZero defeats two professional Go players who participated in this study, securing on average 1.98x more territory per game. Beyond its strength, we use WallZero to assess game fairness and identify key strategies for mastering WallGo. Interestingly, our results show that the opening used in the Netflix series yields a more balanced game. Our code is available at https://rlg.iis.sinica.edu.tw/papers/wallzero.

翻译：WallGo是一种近期推出的策略棋盘游戏，因2025年Netflix系列剧《魔鬼的计谋》而广为人知。尽管在小型7x7棋盘上进行，但其结合了棋子移动与墙壁放置的机制，产生了极高的博弈树复杂度与错综复杂的战略互动。尽管其日益流行，WallGo仍未得到充分探索。本文提出WallZero——一个基于AlphaZero的双人WallGo博弈智能体。我们引入了定制化的动作与特征设计，显著提升了游戏表现。在评估中，WallZero击败了参与本研究的两位职业围棋选手，每局平均占据1.98倍领地。除竞技实力外，我们利用WallZero评估了游戏公平性，并识别出掌握WallGo的关键策略。有趣的是，我们的结果表明，Netflix剧集中采用的开局方式会产生更均衡的游戏。我们的代码开源地址为：https://rlg.iis.sinica.edu.tw/papers/wallzero。