diff --git a/chess.py b/chess.py
index ddc70c6..7d342cd 100644
--- a/chess.py
+++ b/chess.py
@@ -490,7 +490,6 @@ class Game:
            the move puts the player in check."""
         new = deepcopy(self)
         valid = new.move(source, dest, promotion)
-        new.turn = self.turn
         return valid, new
 
     def AN_move(self, move):
@@ -517,8 +516,9 @@ class Game:
         moves = []
         for sq in sqrs:
             valid, new = self.validate_move(sq, dest, promotion)
-            check = new.is_check()==info.check and new.is_mate()==info.mate
-            if valid and check:
+            check = new.is_check()==info.check
+            mate  = new.is_mate()==info.mate
+            if valid and (check or mate):
                 moves.append((sq, dest, promotion))
         if len(moves) != 1:
             return False
diff --git a/main.py b/main.py
index 120d1d6..7eb89de 100644
--- a/main.py
+++ b/main.py
@@ -34,7 +34,8 @@ def move():
     id = request.get_cookie("gameid", secret=KEY)
     valid = True
     if is_submitted("newgame"):
-        del games[id]
+        if id in games:
+            del games[id]
         redirect("/")
     if is_submitted("prev"):
         games[id].prev()