diff --git a/tetromino.py b/tetromino.py
index 079807b..e4314d5 100644
--- a/tetromino.py
+++ b/tetromino.py
@@ -186,13 +186,13 @@ class Tetromino():
             offset_map= {
                 'i': {0: 9, 1: 8, 2: 9, 3: 8},
                 'a': {0: 9, 1: 8, 2: 9, 3: 8},
-                'b': {0: 9, 1: 8, 2: 9, 3: 8},
+                'b': {0: 9, 1: 9, 2: 9, 3: 9},
                 'c': {0: 9, 1: 9, 2: 9, 3: 9},
                 'o': {0: 9, 1: 9, 2: 9, 3: 9},
                 'd': {0: 9, 1: 9, 2: 9, 3: 9},
                 't': {0: 9, 1: 9, 2: 9, 3: 8},
-                's': {0: 9, 1: 9, 2: 9, 3: 9},
-                'z': {0: 9, 1: 9, 2: 9, 3: 9},
+                's': {0: 9, 1: 8, 2: 9, 3: 8},
+                'z': {0: 9, 1: 8, 2: 9, 3: 8},
                 'j': {0: 9, 1: 8, 2: 9, 3: 9},
                 'l': {0: 9, 1: 8, 2: 9, 3: 9}
             }