Recent philosophy of language has seen a surge of interest in how language can change the attitudes and feelings of conversational parties, in particular when it comes to hate speech and political speech. Another socially relevant area where language plays a key role in changing feelings and attitudes is psychotherapy. After all, a large number of therapeutic approaches is done verbally, in the form of a conversation between therapist and client. This raises the question whether insights from philosophy of language also help shed light on the workings and the effectiveness of therapeutic conversations. The main thesis of the present talk is that David Lewis' scorekeeping model of language use enhances our understanding of the effectiveness and the linguistic workings of several core methods and interventions of talking therapy. Speaking on an abstract level, these methods and interventions are effective by changing the score of the therapeutic conversation, in particular in the form of accommodation. Using various examples, we will show that this can affect different components of conversational score.