diff --git a/pysollib/pysolrandom.py b/pysollib/pysolrandom.py
index 195b085e..27642863 100644
--- a/pysollib/pysolrandom.py
+++ b/pysollib/pysolrandom.py
@@ -26,7 +26,7 @@
 import re
 
 import pysol_cards
-assert getattr(pysol_cards, 'VERSION', (0, 0, 0)) >= (0, 8, 11), (
+assert getattr(pysol_cards, 'VERSION', (0, 0, 0)) >= (0, 8, 12), (
     "Newer version of https://pypi.org/project/pysol-cards is required.")
 import pysol_cards.random  # noqa: I100
 import pysol_cards.random_base  # noqa: I100
@@ -52,16 +52,6 @@ class MFXRandom(pysol_cards.random.PysolRandom):
     def setstate(self, state):
         self.seed = state
 
-    #
-    # implementation
-    #
-
-    def choice(self, seq):
-        return seq[int(self.random() * len(seq))]
-
-    def randrange(self, a, b):
-        return self.randint(a, b-1)
-
 
 # ************************************************************************
 # * Linear Congruential random generator