diff --git a/src/rules.py b/src/rules.py
index eaca103..f53a32e 100644
--- a/src/rules.py
+++ b/src/rules.py
@@ -1,8 +1,23 @@
 class Rules:
 	def __init__(self):
-		name = None
-		nb_row = None
-		nb_col = None
+		self.name = None
+		self.nb_row = None
+		self.nb_col = None
 
+	def check_board_size(self, board: Board) -> Bool:
+	""" Checks if the board size is correct.
+	Entries:
+		self: the Rules class itself
+		board -> Board: a board
+	Output:
+		correct -> Bool: if True, the board size is correct
+	"""
+		correct = True
 
-	
\ No newline at end of file
+		if not self.nb_col == board.nb_col:
+			correct = False
+
+		if not self.nb_row == board.nb_row:
+			correct = False
+
+		return correct