diff --git a/100_Numpy_exercises_with_hints_with_solutions.md b/100_Numpy_exercises_with_hints_with_solutions.md
index d3ddde2..29f4f71 100644
--- a/100_Numpy_exercises_with_hints_with_solutions.md
+++ b/100_Numpy_exercises_with_hints_with_solutions.md
@@ -1087,7 +1087,7 @@ windows = np.lib.stride_tricks.sliding_window_view(Z, (k, k))
 S = windows[::k, ::k, ...].sum(axis=(-2, -1))
 
 # alternative solution (by @Gattocrucco)
-S = Z.reshape(4, 4, 4, 4).swapaxes(1, 2).sum((2, 3))
+S = Z.reshape(4, 4, 4, 4).sum((1, 3))
 ```
 #### 88. How to implement the Game of Life using numpy arrays? (★★★)
 `No hints provided...`
diff --git a/100_Numpy_exercises_with_solutions.md b/100_Numpy_exercises_with_solutions.md
index f366208..af8413c 100644
--- a/100_Numpy_exercises_with_solutions.md
+++ b/100_Numpy_exercises_with_solutions.md
@@ -1087,7 +1087,7 @@ windows = np.lib.stride_tricks.sliding_window_view(Z, (k, k))
 S = windows[::k, ::k, ...].sum(axis=(-2, -1))
 
 # alternative solution (by @Gattocrucco)
-S = Z.reshape(4, 4, 4, 4).swapaxes(1, 2).sum((2, 3))
+S = Z.reshape(4, 4, 4, 4).sum((1, 3))
 ```
 #### 88. How to implement the Game of Life using numpy arrays? (★★★)
 
diff --git a/source/exercises100.ktx b/source/exercises100.ktx
index 3f71c5d..a0725c6 100644
--- a/source/exercises100.ktx
+++ b/source/exercises100.ktx
@@ -1334,7 +1334,7 @@ windows = np.lib.stride_tricks.sliding_window_view(Z, (k, k))
 S = windows[::k, ::k, ...].sum(axis=(-2, -1))
 
 # alternative solution (by @Gattocrucco)
-S = Z.reshape(4, 4, 4, 4).swapaxes(1, 2).sum((2, 3))
+S = Z.reshape(4, 4, 4, 4).sum((1, 3))
 
 < q88
 How to implement the Game of Life using numpy arrays? (★★★)