diff --git a/unitary/engine_utils.py b/unitary/engine_utils.py
index 0f1c6bc9..5b78ee07 100644
--- a/unitary/engine_utils.py
+++ b/unitary/engine_utils.py
@@ -60,9 +60,11 @@ def _get_program_id(program: Any):
         return str(uuid.uuid4())
 
     parts = [
-        p
-        if len(p) <= chars_per_part
-        else p[: chars_per_part // 2] + p[-chars_per_part // 2 :]
+        (
+            p
+            if len(p) <= chars_per_part
+            else p[: chars_per_part // 2] + p[-chars_per_part // 2 :]
+        )
         for p in parts
     ]
     return "_".join(parts)
diff --git a/unitary/examples/quantum_rpg/ascii_art.py b/unitary/examples/quantum_rpg/ascii_art.py
index b6ed4d39..08eef985 100644
--- a/unitary/examples/quantum_rpg/ascii_art.py
+++ b/unitary/examples/quantum_rpg/ascii_art.py
@@ -1,6 +1,5 @@
 """ASCII art and other large text constants."""
 
-
 # ASCII art generated with font
 # DOOM by Frans P. de Vries <fpv@xymph.iaf.nl>  18 Jun 1996
 # based on Big by Glenn Chappell 4/93 -- based on Standard
diff --git a/unitary/examples/quantum_rpg/classes.py b/unitary/examples/quantum_rpg/classes.py
index 13473725..c22e2da5 100644
--- a/unitary/examples/quantum_rpg/classes.py
+++ b/unitary/examples/quantum_rpg/classes.py
@@ -75,9 +75,7 @@ def actions(self) -> Dict[str, Callable]:
             ),
         }
         if self.level >= 3:
-            action_dict[
-                "s"
-            ] = (
+            action_dict["s"] = (
                 lambda monster, qubit: f"Sample result {monster.sample(monster.quantum_object_name(qubit), False)}"
             )
         return action_dict
diff --git a/unitary/examples/quantum_rpg/input_helpers.py b/unitary/examples/quantum_rpg/input_helpers.py
index d9d52a3e..6e1b44c6 100644
--- a/unitary/examples/quantum_rpg/input_helpers.py
+++ b/unitary/examples/quantum_rpg/input_helpers.py
@@ -1,4 +1,5 @@
 """Functions for safe and user-friendly input."""
+
 from typing import Callable, Optional, Sequence, TextIO
 
 import sys
diff --git a/unitary/quantum_chess/quantum_board.py b/unitary/quantum_chess/quantum_board.py
index 6ac79e03..4039e4c0 100644
--- a/unitary/quantum_chess/quantum_board.py
+++ b/unitary/quantum_chess/quantum_board.py
@@ -427,9 +427,9 @@ def _generate_accumulations(self, repetitions: int = 1000) -> None:
                 probs = self._apply_cache(
                     previous_probability, last_move, self.cache[cache_key]
                 )
-                self.move_history_probabilities_cache[
-                    -1
-                ] = self._make_probability_history(repetitions, probs)
+                self.move_history_probabilities_cache[-1] = (
+                    self._make_probability_history(repetitions, probs)
+                )
                 # Remove entry from cached since it has been consumed.
                 del self.cache[cache_key]
                 return