This talk is based on the paper "Parameterized Algorithms for Recognizing Monopolar and 2-Subcolorable Graphs" by Iyad Kanj, Christian Komusiewicz, Manuel Sorge, and Erik Jan van Leeuwen (http://dx.doi.org/10.4230/LIPIcs.SWAT.2016.14), which appeared in SWAT 2016 and was selected for a contributed talk at HALG 2017.