Computer Games Fourth Workshop on Computer Games, CGW 2015, and the Fourth Workshop on General Intelligence in Game-Playing Agents, GIGA 2015, Held in Conjunction with the 24th International Conference on Artificial Intelligence, IJCAI 2015, Buenos Aires, Argentina, July 26-27, 2015, Revised Selected Papers - Cazenave, Tristan; Winands, Mark H.M; Edelkamp, Stefan; Schiffel, Stephan; Thielscher, Michael; Togelius, Julian (Springer International Publishing : Imprint: Springer, 2016)