Yi Yang 0029 Shuigeng Zhou Jihong Guan Chuansheng Shen The Complexities of Random-Turn Hex, Square, and Triangle Games. 180-190 2022 14 IEEE Trans. Games 2 https://doi.org/10.1109/TG.2020.3033720 db/journals/tciaig/tciaig14.html#YangZGS22