diff --git a/src/ai/fitness/holes.py b/src/ai/fitness/holes.py
new file mode 100644
index 0000000..5c8b110
--- /dev/null
+++ b/src/ai/fitness/holes.py
@@ -0,0 +1,22 @@
+from typing import Optional
+
+import numpy as np
+
+from .peaks import get_peaks
+
+
+def get_holes(
+    field: np.ndarray,
+    peaks: Optional[np.array] = None,
+) -> np.array:
+    if peaks is None:
+        peaks = get_peaks(field)
+    col_count = field.shape[1]
+    holes = np.zeros(col_count, dtype=int)
+
+    for col in range(col_count):
+        start = -peaks[col]
+        if start != 0:
+            holes[col] = np.count_nonzero(field[int(start) :, col] == 0)
+
+    return holes
diff --git a/tests/ai/test_fitness.py b/tests/ai/test_fitness.py
index 4f1f8f4..49cbf67 100644
--- a/tests/ai/test_fitness.py
+++ b/tests/ai/test_fitness.py
@@ -48,3 +48,12 @@ class TestFitness(unittest.TestCase):
         answers = (5, 0, 4)
         for field, answer in zip(self.fields, answers):
             self.assertEqual(get_bumpiness(None, field), answer)
+
+    def test_get_holes(self):
+        answers = (
+            np.array([1, 1, 0, 1, 2]),
+            np.array([0, 0, 0, 0, 0]),
+            np.array([0, 1, 0, 0, 0]),
+        )
+        for field, answer in zip(self.fields, answers):
+            self.assertTrue(np.array_equal(get_holes(field), answer))