Background: Trial-based thought record (TBTR) is a technique used in trial-based cognitive therapy (TBCT), and simulates a court trial. It was designed to restructure unhelpful core beliefs (CBs) during psychotherapy. Objective: To confirm previous findings on the efficacy of TBTR in decreasing patients’ adherence to self-critical and unhelpful CBs and corresponding emotions, as well as assessing the differential efficacy of the empty-chair approach relative to the static format of TBTR. Methods: Thirty-nine outpatients were submitted to a 50-minute, one-session, application of the TBTR technique in the empty-chair (n = 18) or conventional (n = 21) formats. Patients’ adherence to unhelpful CBs and the intensity of corresponding emotions were assessed after each step of TBTR, and the results obtained in each format were compared. Results: Significant reductions in percent values both in the credit given to CBs and in the intensity of corresponding emotions were observed at the end of the session (p < .001), relative to baseline values. ANCOVA also showed a significant difference in favor of the empty-chair format for both belief credit and emotion intensity (p = .04). Discussion: TBTR may help patients reduce adherence to unhelpful CBs and corresponding emotions and the empty-chair format seems to be more efficacious than the conventional format.