diff --git a/board.py b/board.py
index 5150d35..bfa7998 100644
--- a/board.py
+++ b/board.py
@@ -33,7 +33,7 @@ class Board:
         negatives = [x if x < 0 else 0 for x in board]
         board.append(15 - sum(positives))
         board.append(-15 - sum(negatives))
-        return board
+        return tuple(board)
             
             
 
diff --git a/bot.py b/bot.py
index 620e399..ca2f734 100644
--- a/bot.py
+++ b/bot.py
@@ -52,7 +52,7 @@ class Bot:
     # TODO: Test this, the score results should be deterministic
     def make_pubeval_move(self, board, sym, roll):
         legal_moves = Board.calculate_legal_states(tuple(board), sym, roll)
-        moves_and_scores = [(board, pubeval.eval(False, board)) for board in legal_moves]
+        moves_and_scores = [(board, pubeval.eval(False, Board.board_features_to_pubeval(board, sym))) for board in legal_moves]
         scores = [ x[1] for x in moves_and_scores ]
         best_move_pair = moves_and_scores[np.array(scores).argmax()]
         return best_move_pair
diff --git a/game.py b/game.py
index 1abfb23..2da10ea 100644
--- a/game.py
+++ b/game.py
@@ -184,7 +184,7 @@ class Game:
                         roll = self.roll()
                         self.board = (self.p1.make_move(self.board, self.p1.get_sym(), roll))[0]
                         roll = self.roll()
-                        self.board = Board.flip(self.p2.make_pubeval_move(Board.board_features_to_pubeval(self.board, self.p2.get_sym()), self.p2.get_sym(), roll)[0][0:26])
+                        self.board = Board.flip(self.p2.make_pubeval_move(self.board, self.p2.get_sym(), roll)[0][0:26])
                     sys.stderr.write("\t outcome {}".format(Board.outcome(self.board)[1]))
                     outcomes.append(Board.outcome(self.board)[1])
                     sys.stderr.write("\n")
diff --git a/pubeval/pubeval.c b/pubeval/pubeval.c
index 159ee09..f3aee29 100644
--- a/pubeval/pubeval.c
+++ b/pubeval/pubeval.c
@@ -1,5 +1,7 @@
 #include <Python.h>
 
+static PyObject* PubevalError;
+
 static float x[122];
 
 static const float wc[122] = {
@@ -140,7 +142,11 @@ pubeval_eval(PyObject *self, PyObject *args) {
   numValues = PyTuple_Size(tuple_obj);
 
   if (numValues < 0) return NULL;
-
+  if (numValues != 28) {
+    PyErr_SetString(PubevalError, "Tuple must have 28 entries");
+    return NULL;
+  }
+  
   // Iterate over tuple to retreive positions
   for (int i=0; i<numValues; i++) {
     val_obj = PyTuple_GetItem(tuple_obj, i);
@@ -168,6 +174,15 @@ static struct PyModuleDef pubeval_definition = {
 };
 
 PyMODINIT_FUNC PyInit_pubeval(void) {
-  //Py_Initialize();
-  return PyModule_Create(&pubeval_definition);
+  PyObject* module;
+
+  module = PyModule_Create(&pubeval_definition);
+  if (module == NULL)
+    return NULL;
+    
+  PubevalError = PyErr_NewException("pubeval.error", NULL, NULL);
+  Py_INCREF(PubevalError);
+  PyModule_AddObject(module, "error", PubevalError);
+  
+  return module;
 }
diff --git a/pubeval/setup.py b/pubeval/setup.py
index 3a9f114..1fa95c6 100644
--- a/pubeval/setup.py
+++ b/pubeval/setup.py
@@ -4,6 +4,6 @@ pubeval = Extension('pubeval',
                     sources = ['pubeval.c'])
 
 setup (name = 'pubeval',
-       version = '0.2',
+       version = '0.3',
        description = 'Pubeval for Python',
        ext_modules = [pubeval])