Combinatorial Game Theory (CGT) is a branch of mathematics that studies sequential games with perfect information. Combinatorial games include well-known rulesets like Amazons, Clobber, Domineering, Hackenbush, Konane, Nim, Octal Games, Wythoff’s Nim. After the John Conway's book On Numbers and Games (1976), Elwyn Berlekamp, John Conway and Richard Guy published “the” Winning Ways (1982). In this book we can see a unified mathematical theory able to analyze a large class of rulesets. The modern books Lessons in Play (2007), by Michael Albert, David Wolfe, and Richard Nowakowski, and Combinatorial Game Theory (2013), by Aaron Siegel, are also mandatory reading.

Combinatorial Game Theory Colloquium,
organized by Associação Ludus, is held every two years, in Portugal. The fundamental idea of these conferences is to join, on European soil, the world's top experts on the subject. That way, they can share and join efforts on important open problems and spread the topic more consistently beyond United States and Canada, where it is most widely deployed.