diff --git a/litris.py b/litris.py
index 1541b63..b7776aa 100644
--- a/litris.py
+++ b/litris.py
@@ -202,7 +202,7 @@ class Litris(GameBase):
         if np.array_equal(stone, BLOCK_FULL):
             # block
             for e in range(19, 17, - 1):
-                for i in range(0, 19, 1):
+                for i in range(0, 18, 1):
                     if current_board[e][i] == 0 and current_board[e - 1][i] == 0 and current_board[e][i + 1] == 0 and current_board[e - 1][i + 1] == 0:
                         if e == 19:
                             return i - BLOCK_COL
@@ -211,27 +211,27 @@ class Litris(GameBase):
         if np.array_equal(stone, BL3_FULL):
             # block
             for e in range(19, 17, - 1):
-                for i in range(0, 19, 1):
+                for i in range(0, 18, 1):
                     if current_board[e][i] == 1 and current_board[e - 1][i] == 0 and current_board[e][i + 1] == 0 and current_board[e - 1][i + 1] == 0:
                         return i - Bl3_COL
         elif np.array_equal(stone, L1_FULL):
             # L1
             for e in range(19, 17, - 1):
-                for i in range(0, 19, 1):
+                for i in range(0, 17, 1):
                     if current_board[e][i] == 0 and current_board[e][i + 1] == 0 and current_board[e][i + 2] == 0 and \
                             current_board[e - 1][i + 2] == 0:
                         return i - L1_COL
         elif np.array_equal(stone, L2_FULL):
             # L1
             for e in range(19, 17, - 1):
-                for i in range(0, 19, 1):
+                for i in range(0, 17, 1):
                     if current_board[e - 1][i] == 0 and current_board[e - 1][i + 1] == 0 and current_board[e - 1][i + 2] == 0 and \
                             current_board[e][i + 2] == 0 and current_board[e][i] == 1 and current_board[e][i + 1] == 1:
                         return i - L2_COL
         elif np.array_equal(stone, LINE_FULL):
             # Line
             for e in range(19, 18, - 1):
-                for i in range(0, 19, 1):
+                for i in range(0, 16, 1):
                     if current_board[e][i] == 0 and current_board[e][i + 1] == 0 and current_board[e][i + 2] == 0 and \
                             current_board[e][i + 3] == 0:
                         if e == 19:
@@ -251,7 +251,7 @@ class Litris(GameBase):
         elif np.array_equal(stone, DDOT_FULL) :
             # DDot
             for e in range(19, 18, - 1):
-                for i in range(0, 19, 1):
+                for i in range(0, 18, 1):
                     if current_board[e][i] == 0 and current_board[e][i + 1] == 0:
                         if e == 19:
                             return i - DDOT_COL
@@ -260,7 +260,7 @@ class Litris(GameBase):
         elif np.array_equal(stone, DDDOT_FULL) :
             # DDot
             for e in range(19, 18, - 1):
-                for i in range(0, 19, 1):
+                for i in range(0, 17, 1):
                     if current_board[e][i] == 0 and current_board[e][i + 1] == 0 and current_board[e][i + 2] == 0:
                         if e == 19:
                             return i - DDDOT_COL