 Walter Felscher (1985) follows a common method for writing winning strategies (Lorenzen &amp; Lorenz 1978; Lorenz 1981) that uses the semantic tableaux of Beth (1955), and his technical achievements have strongly influenced some logicians when working with the dialogical framework or some variation of it, notably Sørensen and Urzyczyn (2007); Alama et al. (2011); Uckelman et al. (2014); Dutilh Novaes (2015; 2020); Dutilh Novaes and French (2018); French (2021). Another author which had considerable influence for these works is Christian Fermüller, for example Fermüller (2003).