diff --git a/day13.py b/day13.py
index 72cb37c..253b9c7 100644
--- a/day13.py
+++ b/day13.py
@@ -7,31 +7,33 @@ from typing import Any
 def get_reflection_value(grid: Grid, ignore: int = 0) -> int:
     # search horizontal
     for x in grid.rangeX():
+        nx = x + 1
         col = grid.get_column(x)
-        if col == grid.get_column(x + 1):
+        if col == grid.get_column(nx):
             match = True
             for dx in range(1, grid.maxX - x):
                 if x - dx < 0:
                     break
-                if grid.get_column(x - dx) != grid.get_column(x + dx + 1):
+                if grid.get_column(x - dx) != grid.get_column(nx + dx):
                     match = False
                     break
-            if match and x + 1 != ignore:
-                return x + 1
+            if match and nx != ignore:
+                return nx
 
     # search vertical
     for y in grid.rangeY():
+        ny = y + 1
         row = grid.get_row(y)
-        if row == grid.get_row(y + 1):
+        if row == grid.get_row(ny):
             match = True
             for dy in range(1, grid.maxY - y):
                 if y - dy < 0:
                     break
-                if grid.get_row(y - dy) != grid.get_row(y + dy + 1):
+                if grid.get_row(y - dy) != grid.get_row(ny + dy):
                     match = False
                     break
-            if match and 100 * (y + 1) != ignore:
-                return 100 * (y + 1)
+            if match and 100 * ny != ignore:
+                return 100 * ny
 
     return -1
 
@@ -60,16 +62,13 @@ class Day(AOCDay):
     def part2(self) -> Any:
         grids = self.parse_input()
         ref_value = 0
-        for i, grid in enumerate(grids):
+        for grid in grids:
             orig_ref = get_reflection_value(grid)
             found = False
             for x in grid.rangeX():
                 for y in grid.rangeY():
                     c = Coordinate(x, y)
-                    if grid.get(c) == "#":
-                        grid.set(c, ".")
-                    else:
-                        grid.set(c, "#")
+                    grid.set(c, "." if grid.get(c) == "#" else "#")
 
                     v = get_reflection_value(grid, orig_ref)
                     if v > 0:
@@ -77,10 +76,7 @@ class Day(AOCDay):
                         found = True
                         break
 
-                    if grid.get(c) == "#":
-                        grid.set(c, ".")
-                    else:
-                        grid.set(c, "#")
+                    grid.set(c, "." if grid.get(c) == "#" else "#")
 
                 if found:
                     break