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diff --git a/challenge-266/sgreen/python/ch-2.py b/challenge-266/sgreen/python/ch-2.py
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+++ b/challenge-266/sgreen/python/ch-2.py
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+#!/usr/bin/env python3
+
+import json
+import sys
+
+
+def x_matrix(matrix: list) -> bool:
+    """Determine if the matrix is a X Matrix
+
+    Args:
+        matrix (list): The supplied matrix
+
+    Returns:
+        bool: Wether the matrix as a X Matrix or not
+    """
+    rows = len(matrix)
+
+    # Check we have a square
+    for row in range(rows):
+        if len(matrix[row]) != rows:
+            raise ValueError("Please specify a square matrix")
+
+    # Check that all the values are correct
+    for row in range(rows):
+        for col in range(rows):
+            if col == row or col == rows - 1 - row:
+                # We are expecting a non-zero value
+                if matrix[row][col] == 0:
+                    return False
+            elif matrix[row][col] != 0:
+                # We are expecting a zero value
+                return False
+
+    return True
+
+
+def main():
+    # Parse the matrix from the input
+    matrix = json.loads(sys.argv[1])
+    result = x_matrix(matrix)
+    print('true' if result else 'false')
+
+
+if __name__ == '__main__':
+    main()