Xue-Feng Zhang (张学锋 ,1,2,* Yu-Chuan Wen (文渝川 ,3 and Sebastian Eggert1 1Physics Department and Research Center OPTIMAS, University of Kaiserslautern, 67663 Kaiserslautern, Germany 2Institute of Theoretical Physics, Chinese Academy of Sciences, P.O. Box 2735, Beijing 100190, China 3Center of Theoretical Physics, Department of Physics, Capital Normal University, Beijing 10048, China Received 11 No...

The 2017 Olympiad in Leiden hosted two Hex tournaments, board sizes 11×11 and 13×13. Three programs competed in each tournament. These are at present the only annual computer Hex tournaments. 11×11 is the original board size introduced by Piet Hein in 1942. Recently, all 1-move openings on 9×9Hex have been solved by computers, as have two 10×10 openings [9]. So, in recent years the 13×13 compet...