diff --git a/reasoning_gym/games/tsumego.py b/reasoning_gym/games/tsumego.py
index c56bbd25..4e3048d3 100644
--- a/reasoning_gym/games/tsumego.py
+++ b/reasoning_gym/games/tsumego.py
@@ -200,7 +200,7 @@ class TsumegoDataset(ProceduralDataset):
 
         board, solution = self._generate_capture_problem(size, rng)
         board_str = self._board_to_string(board)
-        solution_str = f"{chr(ord('A')+solution[1])}{solution[0]+1}"
+        solution_str = f"{chr(ord('A')+solution[1])}{size-solution[0]}"
 
         return {
             "question": (
@@ -225,22 +225,20 @@ class TsumegoDataset(ProceduralDataset):
         if not answer:
             return 0.01
         metadata = entry["metadata"]
-        try:
-            #  get solution from (row, col) tuple
-            expected_row, expected_col = metadata["solution"]
-        except Exception:
-            return 0.01
+        board_size = len(metadata["board"])
+        expected_row, expected_col = metadata["solution"]  # get solution from (row, col) tuple
+
         try:
             # Assume letter-number format, e.g. "C4"
             m = re.match(r"^([A-Za-z])(\d+)$", answer)
             if not m:
                 return 0.01
             col_letter, row_str = m.group(1), m.group(2)
-            row = int(row_str) - 1
+            row = board_size - int(row_str)
             col = ord(col_letter.upper()) - ord("A")
             if (row, col) == (expected_row, expected_col):
                 return 1.0
-            board_size = metadata["board_size"]
+
             if 0 <= row < board_size and 0 <= col < board_size:
                 return 0.05
         except Exception:
diff --git a/tests/test_tsumego.py b/tests/test_tsumego.py
index a1e6e6b5..82a5b67f 100644
--- a/tests/test_tsumego.py
+++ b/tests/test_tsumego.py
@@ -100,7 +100,10 @@ def test_liberties_and_move():
 def test_score_answer():
     config = TsumegoConfig(min_board_size=9, max_board_size=9, max_stones=10, size=5)
     dataset = TsumegoDataset(config)
-    entry = {"metadata": {"board_size": 9, "solution": (4, 4)}}
+
+    # prepare dummy
+    entry = dataset[0].copy()
+    entry["metadata"]["solution"] = (4, 4)
 
     # Correct letter-number answer (E corresponds to 5)
     assert dataset.score_answer("E5", entry) == 1.0
@@ -120,7 +123,9 @@ def test_score_answer():
     # Out-of-bound letter-number move: 'J' corresponds to 10 which is greater than board size = 9
     assert dataset.score_answer("J9", entry) == 0.01
 
+    # test optimal score for answers
     for x in dataset:
+        assert len(x["metadata"]["board"]) == x["metadata"]["difficulty"]["board_size"]
         assert dataset.score_answer(x["answer"], entry=x) == 1.0