Ryan Bruce Hayward, a Canadian mathematician, computer scientist, and professor at Department of Computing Science at University of Alberta. Ryan Hayward is particularly interested in Hex, which he learned from Claude Berge. As member of the University of Alberta's GAMES research group [1], he leads a team that developed Hex solver and players. The Hex programs Wolve (2008) and MoHex (2009, 2010) won the Gold Medal in Hex at the Computer Olympiad. Wolve does a truncated Alpha-Beta search of two and up to four plies, considering the huge Branching Factor of Hex. Since 2009 Monte-Carlo Tree Search starts to dominate, and MoHex applies MCTS along with the UCT framework combined with the allmoves-as-first (AMAF) heuristic to select the best child during tree traversal [2] .
Ryan B. Hayward [3]

Selected Publications

2000 ...

• Ryan Hayward, Yngvi Björnsson, Michael Johanson, Morgan Kan, Nathan Po, Jack van Rijswijck (2003). Solving 7x7 Hex: Virtual Connections and Game-state Reduction. Advances in Computer Games 10, pdf
• Gábor Melis, Ryan Hayward (2003). Six wins Hex Tournament. ICGA Journal, Vol. 26, No. 4, pdf » 8th Computer Olympiad

2005 ...

• Ryan Hayward, Yngvi Björnsson, Michael Johanson, Morgan Kan, Nathan Po, Jack van Rijswijck (2005). Solving 7x7 Hex with domination, fill-in, and virtual connections. Theoretical Computer Science, 349(2):123–139, 2005. pdf
• Yngvi Björnsson, Ryan Hayward, Michael Johanson, Jack van Rijswijck (2006). Dead Cell Analysis in Hex and the Shannon Game. In Graph Theory in Paris: Proceedings of a Conference in Memory of Claude Berge (CT'04 Paris), pp. 45–60, 2006. zipped ps
• Ryan Hayward, Jack van Rijswijck (2006). Hex and Combinatorics. Discrete Math 306, pdf
• Ryan Hayward (2006). Six Wins Hex tournament. ICGA Journal, Vol. 29, No 3, pdf » 11th Computer Olympiad
• Ryan Hayward, Broderick Arneson, Philip Henderson (2006). Automatic Strategy Verification for Hex. CG 2006, pdf
• Philip Henderson, Ryan Hayward (2008). Probing the 4-3-2 Edge Template in Hex. CG 2008, pdf
• Broderick Arneson, Ryan Hayward, Philip Henderson (2009). Wolve 2008 wins Hex tournament. ICGA Journal, Vol. 32, No. 1 » 13th Computer Olympiad
• Philip Henderson, Broderick Arneson, Ryan Hayward (2009). Solving 8×8 Hex. IJCAI-09, pdf
• Broderick Arneson, Ryan Hayward, Philip Henderson (2009). MoHex wins Hex tournament. ICGA Journal, Vol. 32, No. 2, pdf » 14th Computer Olympiad

2010 ...

• Philip Henderson, Broderick Arneson, Ryan Hayward (2010). Hex, Braids, the Crossing Rule, and XH-Search. Advances in Computer Games 12, pdf
• Broderick Arneson, Ryan Hayward, Philip Henderson (2010). MoHex wins Hex Tournament. ICGA Journal, Vol. 33, No. 3, pdf » 15th Computer Olympiad
• Broderick Arneson, Ryan Hayward, Philip Henderson (2010). Solving Hex: Beyond Humans. CG 2010, pdf
• Broderick Arneson, Ryan Hayward, Philip Henderson (2010). Monte Carlo Tree Search in Hex. IEEE Transactions on Computational Intelligence and AI in Games, Vol. 2, No. 4, pdf
• Henry Brausen, Ryan Hayward, Martin Müller, Abdul Qadir, David Spies (2011). Blunder Cost in Go and Hex. Advances in Computer Games 13
• Ryan Hayward (2012). MoHex wins Hex Tournament. ICGA Journal, Vol. 35, No. 2 » 16th Computer Olympiad
• Ryan Hayward, Broderick Arneson, Shih-Chieh Huang, Jakub Pawlewicz (2013). MOHEX Wins Hex Tournament. ICGA Journal, Vol. 36, No. 3, pdf » 17th Computer Olympiad
• Shih-Chieh Huang, Broderick Arneson, Ryan Hayward, Martin Müller, Jakub Pawlewicz (2013). MoHex 2.0: a pattern-based MCTS Hex player. CG 2013, pdf
• Jakub Pawlewicz, Ryan Hayward (2013). Scalable Parallel DFPN Search. CG 2013

2015 ...

• Jakub Pawlewicz, Ryan Hayward (2015). Feature Strength and Parallelization of Sibling Conspiracy Number Search. Advances in Computer Games 14
• Jakub Pawlewicz, Ryan Hayward (2015). Sibling Conspiracy Number Search. SoCS 2015
• Kenny Young, Ryan Hayward (2016). A Reverse Hex Solver. CG 2016
• Ryan Hayward, Jakub Pawlewicz, Kei Takada, Tony van der Valk (2017). MOHEX Wins 2015 Hex 11x11 and Hex 13x13 Tournaments. ICGA Journal, Vol. 39, No. 1 » 18th Computer Olympiad
• Noah Weninger, Ryan Hayward (2017). Exploring Positional Linear Go. Advances in Computer Games 15, pdf

External Links

• Webpage of Ryan B. Hayward
• Ryan Hayward's ICGA Tournaments
• The Mathematics Genealogy Project - Ryan Hayward

References

1. ^ The University of Alberta GAMES Group
2. ^ Broderick Arneson, Ryan Hayward, Philip Henderson (2010). Monte Carlo Tree Search in Hex. IEEE Transactions on Computational Intelligence and AI in Games, Vol. 2, No. 4, pdf
3. ^ Webpage of Ryan B. Hayward
4. ^ Publications of Ryan B. Hayward

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