diff --git a/mahjong_utils/point_by_han_hu.py b/mahjong_utils/point_by_han_hu.py
index 01df1bc..c6c8fd9 100644
--- a/mahjong_utils/point_by_han_hu.py
+++ b/mahjong_utils/point_by_han_hu.py
@@ -15,8 +15,8 @@ def _ceil100(x):
 }
 
 no_tsumo = {
+    (1, 20), (1, 25), (1, 110),
     (2, 25),
-    (1, 110)
 }
 
 
@@ -44,7 +44,10 @@ def build_han_hu_to_parent_point(mapping):
     """
     for han in range(1, 5):
         for hu in range(20, 120, 10):
-            mapping[han, hu] = _calc_parent_point(han, hu)
+            if (han, hu) not in no_ron and (han, hu) not in no_tsumo:
+                mapping[han, hu] = _calc_parent_point(han, hu)
+
+    for han in range(2, 4):
         mapping[han, 25] = _calc_parent_point(han, 25)
 
     mapping[5, 20] = 12000, 4000
@@ -84,7 +87,8 @@ def build_han_hu_to_child_point(mapping):
     """
     for han in range(1, 5):
         for hu in range(20, 120, 10):
-            mapping[han, hu] = _calc_child_point(han, hu)
+            if (han, hu) not in no_ron and (han, hu) not in no_tsumo:
+                mapping[han, hu] = _calc_child_point(han, hu)
 
     for han in range(2, 4):
         mapping[han, 25] = _calc_child_point(han, 25)
diff --git a/test/test_han_hu.py b/test/test_han_hu.py
index 3103b0a..d5ac0e7 100644
--- a/test/test_han_hu.py
+++ b/test/test_han_hu.py
@@ -1,3 +1,5 @@
+import pytest
+
 from mahjong_utils.point_by_han_hu import get_parent_point_by_han_hu, get_child_point_by_han_hu
 
 
@@ -7,9 +9,25 @@ def test_get_parent_point_by_han_hu():
     assert get_parent_point_by_han_hu(5, 40) == (12000, 4000)
     assert get_parent_point_by_han_hu(16, 40) == (48000, 16000)
 
+    assert get_parent_point_by_han_hu(2, 25) == (2400, 0)
+
+    with pytest.raises(ValueError):
+        get_parent_point_by_han_hu(1, 20)
+
+    with pytest.raises(ValueError):
+        get_parent_point_by_han_hu(1, 25)
+
 
 def test_get_child_point_by_han_hu():
     assert get_child_point_by_han_hu(2, 30) == (2000, 1000, 500)
     assert get_child_point_by_han_hu(4, 40) == (8000, 4000, 2000)
     assert get_child_point_by_han_hu(5, 40) == (8000, 4000, 2000)
     assert get_child_point_by_han_hu(16, 40) == (32000, 16000, 8000)
+
+    assert get_child_point_by_han_hu(2, 25) == (1600, 0, 0)
+
+    with pytest.raises(ValueError):
+        get_child_point_by_han_hu(1, 20)
+
+    with pytest.raises(ValueError):
+        get_child_point_by_han_hu(1, 25)