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Home/pawn-brotherhood.py

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+def safe_pawns(pawns: set) -> int:
+    cols = "abcdefgh"
+    safe_count = 0
+    for pawn in pawns:
+        row = int(pawn[1])
+        if row == 1:
+            continue
+        col_index = cols.index(pawn[0])
+        protector_1 = cols[col_index - 1] + str(row - 1) if col_index - 1 >= 0 else None
+        protector_2 = cols[col_index + 1] + str(row - 1) if col_index + 1 < len(pawns) and row > 1 else None
+        if protector_1 in pawns or protector_2 in pawns:
+            safe_count += 1
+    return safe_count
+
+
+if __name__ == '__main__':
+    # These "asserts" using only for self-checking and not necessary for auto-testing
+    assert safe_pawns({"b4", "d4", "f4", "c3", "e3", "g5", "d2"}) == 6
+    assert safe_pawns({"b4", "c4", "d4", "e4", "f4", "g4", "e5"}) == 1
+    assert safe_pawns({"a1", "b2", "c3", "d4", "e5", "f6", "g7", "h8"}) == 8
+    print("Coding complete? Click 'Check' to review your tests and earn cool rewards!")