diff --git a/exercises/ex05/ex05a.py b/exercises/ex05/ex05a.py
new file mode 100644
index 0000000..d6f16f5
--- /dev/null
+++ b/exercises/ex05/ex05a.py
@@ -0,0 +1,52 @@
+test1 = {
+    "1h": "bking",
+    "6c": "wqueen",
+    "2g": "bbishop",
+    "5h": "bqueen",
+    "3e": "wking",
+}
+test2 = {
+    "9h": "bking",
+}
+test3 = {
+    "1r": "bking",
+}
+test4 = {
+    "8h": "cking",
+}
+test5 = {
+    "8h": "wring",
+}
+test6 = {
+    "8h": "wking",
+    "7h": "wking",
+}
+test7 = None
+
+
+def isValidChessBoard(board):
+    pieces = "pawn knight bishop rook queen king".split()
+    players = {"w": {}, "b": {}}
+    totals = {"pa": 8, "kn": 2, "bi": 2, "ro": 2, "qu": 1, "ki": 1}
+    if not isinstance(board, dict):
+        return False
+    for k, v in board.items():
+        if len(k) > 2 or k[0] not in "12345678" or k[1] not in "abcdefgh":
+            return False
+        if not isinstance(v, str) or v[0] not in "bw" or v[1:] not in pieces:
+            return False
+        players[v[0]].setdefault(v[1:3], 0)
+        players[v[0]][v[1:3]] += 1
+        # TODO
+        for board in players.values():
+            if board != totals:
+                return False
+    return True
+
+
+for test in [test1, test2, test3, test4, test5, test6, test7]:
+    print(f"Testing board '{test}': ", end="")
+    if isValidChessBoard(test):
+        print("Valid")
+    else:
+        print("Invalid")
diff --git a/exercises/ex05/ex05b.py b/exercises/ex05/ex05b.py
new file mode 100644
index 0000000..e69de29
diff --git a/exercises/ex05/ex05c.py b/exercises/ex05/ex05c.py
new file mode 100644
index 0000000..e69de29