diff --git a/field.py b/field.py
index bda068b..f212fdc 100644
--- a/field.py
+++ b/field.py
@@ -69,7 +69,7 @@ class Field():
         assert column >= 0
         assert column + tetromino.width() <= Field.WIDTH
         assert row - tetromino.height() + 1 >= 0
-        assert row < (Field.HEIGHT / 2)
+        assert row < Field.HEIGHT
         for ti, si in list(enumerate(range(row - tetromino.height() + 1,
                                            row + 1)))[::-1]:
             for tj, sj in enumerate(range(column, column + tetromino.width())):
@@ -87,7 +87,7 @@ class Field():
         assert column >= 0
         assert column + tetromino.width() <= Field.WIDTH
         assert row - tetromino.height() + 1 >= 0
-        assert row < (Field.HEIGHT / 2)
+        assert row < Field.HEIGHT
         for ti, si in list(enumerate(range(row - tetromino.height() + 1,
                                            row + 1)))[::-1]:
             for tj, sj in enumerate(range(column, column + tetromino.width())):
@@ -105,7 +105,9 @@ class Field():
         assert column >= 0
         assert column + tetromino.width() <= Field.WIDTH
         last_fit = -1
-        for row in range(tetromino.height(), (Field.HEIGHT / 2)):
+        for row in range(tetromino.height(), Field.HEIGHT):
+            if Field.HEIGHT <= Field.HEIGHT/2:
+                continue
             if self._test_tetromino(tetromino, row, column):
                 last_fit = row
             else: