diff --git a/2023/9.py b/2023/9.py
index 0328d0f..9b7cb47 100644
--- a/2023/9.py
+++ b/2023/9.py
@@ -1,11 +1,12 @@
 input = [[int(i) for i in l.split()] for l in open("input.txt", 'r').read().splitlines()]
-score = 0
-
 
 def diff(l):
     newList = [l[i+1] - l[i] for i in range(len(l)-1)]
     return l[-1] + diff(newList) if set(newList) != {0} else l[-1]
 
+
 score = sum(diff(l) for l in input)
+score2 = sum(diff(l[::-1]) for l in input)
 
-print(score)
\ No newline at end of file
+print(score)
+print(score2)
\ No newline at end of file
diff --git a/README.md b/README.md
index 1fac45a..34c0d2d 100644
--- a/README.md
+++ b/README.md
@@ -2,8 +2,8 @@ my solutions for the [Advent of Code](https://adventofcode.com/)
 
 in progress:\
 2021: 12/25\
-2022: 7/25\
-2023: 3/25
+2022: 8/25\
+2023: 9/25
 
 planned:\
 2020\