diff --git a/Tetris2000/Tetris2000.py b/Tetris2000/Tetris2000.py
index 721192c..7965179 100644
--- a/Tetris2000/Tetris2000.py
+++ b/Tetris2000/Tetris2000.py
@@ -1118,12 +1118,12 @@ class Stats(QtWidgets.QWidget):
         # ==============================================================================
         if score:
             if (t_spin and nb_complete_lines) or nb_complete_lines == 4:
-                if len(self.back_to_back_scores) < 1:
+                if len(self.back_to_back_scores) > 1:
                     self.back_to_back_scores.append(score // 2)
                 else:
                     # The first Line Clear in the Back-to-Back sequence
                     # does not receive the Back-to-Back Bonus.
-                    self.back_to_back_scores.append(0)
+                    self.back_to_back_scores = [0]
             elif (nb_complete_lines and not t_spin) or len(
                 self.back_to_back_scores
             ) == 1:
@@ -1134,7 +1134,7 @@ class Stats(QtWidgets.QWidget):
                 # do not receive the Back-to-Back Bonus; instead they are scored as normal.
                 # They also cannot start a Back-to-Back sequence, however,
                 # they do not break an existing Back-to-Back sequence.
-                if len(self.back_to_back_scores) < 1:
+                if len(self.back_to_back_scores) > 1:
                     b2b_score = sum(self.back_to_back_scores[1:])
                     self.score_total += b2b_score
                     self.nb_back_to_back += 1