diff --git a/src/graphic.py b/src/graphic.py
index 8fa4276..2aa147b 100755
--- a/src/graphic.py
+++ b/src/graphic.py
@@ -26,13 +26,13 @@ class Screen:
     def user_events(self):
         key = pg.key.get_pressed()
         if key[pg.K_UP]:
-            pacman.change_dir(m_pacman.direction.up)
+            pacman.set_next_dir(m_pacman.direction.up)
         if key[pg.K_DOWN]:
-            pacman.change_dir(m_pacman.direction.down)
+            pacman.set_next_dir(m_pacman.direction.down)
         if key[pg.K_LEFT]:
-            pacman.change_dir(m_pacman.direction.left)
+            pacman.set_next_dir(m_pacman.direction.left)
         if key[pg.K_RIGHT]:
-            pacman.change_dir(m_pacman.direction.right)
+            pacman.set_next_dir(m_pacman.direction.right)
         # print(pacman.direction)
 
     def refresh(self):
diff --git a/src/pacman.py b/src/pacman.py
index 568d038..25d4f5c 100755
--- a/src/pacman.py
+++ b/src/pacman.py
@@ -5,12 +5,13 @@ import os
 from enum import IntEnum
 from collections import namedtuple
 
-_tempdir = namedtuple("Direction", ["up", "down", "left", "right"])
+_tempdir = namedtuple("Direction", ["up", "down", "left", "right", "none"])
 direction = _tempdir(
     up= (0, -1),
     down=(0, 1),
     left=(-1, 0),
-    right=(1, 0)
+    right=(1, 0),
+    none=(0, 0)
 )
 pacdot_counter = 88
 score = 0
@@ -35,14 +36,14 @@ class Fruit:
 
 class Pacman:
     def __init__(self, position=[0, 0], map_size=(28, 31), resolution=10):
-        self.position = [position[0]+int(resolution/2), position[1]+int(resolution/2)]
+        self.position = [position[0]*resolution+int(resolution/2), position[1]*resolution+int(resolution/2)]
         self.direction = direction.right
-        self.next_direction = direction.right
+        self.next_direction = direction.none
         self.super_power = 0                # Counter of super pacdots in effect (> 0 means super power is active)
         self.ghost_combo = 0
         self.size = (1.8, 1.8) # size related to tile size 
         self.speed = 0.1
-        self.resolution = resolution # when pacman in 0:10 he's in the 1st cell if resolution=10
+        self.resolution = resolution # when pacman in 0:10 he's in the 1st cell if resolution=10 !!! must be odd number
         self.map_size = map_size
 
     def matrix_position(self):
@@ -102,10 +103,35 @@ class Pacman:
         lives -= 1
         if lives < 0: # à vérifier
             game_over()
+    
+    def is_at_center_tile(self):
+        """return True if pacman is at the center of a tile else False"""
+        clause_1 = not self.position[0] % (self.resolution/2) and self.position[0] % self.resolution
+        clause_2 = not self.position[1] % (self.resolution/2) and self.position[1] % self.resolution
+        return clause_1 and clause_2
 
     def change_dir(self, new_dir):
         self.direction = new_dir
     
+    def set_next_dir(self, next_dir):
+        if next_dir[0] and self.direction[0]:
+            self.change_dir(next_dir)
+        elif next_dir[1] and self.direction[1]:
+            self.change_dir(next_dir)
+        else:
+            self.next_direction = next_dir
+    
+    def change_to_next_dir(self):
+        self.direction = self.next_direction
+        self.next_direction = direction.none
+    
+    def get_next_dir_tile(self):
+        """return x, y corresponding to the tile if we move with next_direction"""
+        next_x = int(self.position[0] / self.resolution + self.next_direction[0]) % self.map_size[0]
+        next_y = int(self.position[1] / self.resolution + self.next_direction[1]) % self.map_size[1]
+        print(self.position, next_x, next_y)
+        return next_x, next_y
+
     def move(self):
         # self.position[0] += self.direction[0] * self.speed
         # self.position[1] += self.direction[1] * self.speed
diff --git a/src/pacmap.py b/src/pacmap.py
index 7bf10cb..2eff264 100755
--- a/src/pacmap.py
+++ b/src/pacmap.py
@@ -20,6 +20,15 @@ class PhysTile(IntEnum):
     FIT = 6 # fully inaccessible tile
     # ghost-cell ground as FIT ? verify no pac-dot here
 
+class CrossTile(IntEnum):
+    # code where we can find another GRD/TPT Tile from a given Tile
+    # with binary masks
+    UP    = 1 # 0001
+    DOWN  = 2 # 0010
+    LEFT  = 4 # 0100
+    RIGHT = 8 # 1000
+    # direction changement if != 3 or != 12
+
 class Map:
     """
     Pacman maps size is 28×31
@@ -151,6 +160,28 @@ class Map:
 
     def get_tile(self, x, y):
         return self.phys_map[y][x]
+    
+    def create_cross_layer(self):
+        dictionnary = {
+            (0, 1):CrossTile.DOWN,
+            (0, -1): CrossTile.UP,
+            (1, 0): CrossTile.RIGHT,
+            (-1, 0): CrossTile.LEFT
+        }
+        for row in range(self.height):
+            self.intersect_map.append([])
+            for col in range(self.width):
+                if not self.get_tile(col, row) in (PhysTile.GRD, PhysTile.TPT):
+                    self.intersect_map[-1].append(0)
+                if self.get_tile(col, row) in (PhysTile.GRD, PhysTile.TPT):
+                    cpt = 0
+                    for dir in dictionnary:
+                        test_col = (col + dir[0]) % self.width
+                        test_row = (row + dir[1]) % self.height
+                        if self.get_tile(test_col, test_row) in (PhysTile.GRD, PhysTile.TPT):
+                            cpt |= dictionnary[dir]
+                    self.intersect_map[-1].append(cpt)
+
 
 def explore(matrix, x=-1, y=-1):
     """explore the given matrix and change it (GRD and TPT become FIT)"""
@@ -195,4 +226,11 @@ def decode_map(img_file):
             except:
                 raise ValueError("Pixel " + str(col) + "," + str(row) + " is invalid")
             matrix[-1].append(tile)
-    return matrix
\ No newline at end of file
+    return matrix
+
+def get_one_in_digit(number):
+    cpt = 0
+    while number:
+        cpt += number & 1
+        number //= 2
+    return cpt
\ No newline at end of file
diff --git a/src/physic_motor.py b/src/physic_motor.py
index 782b6bd..5037303 100755
--- a/src/physic_motor.py
+++ b/src/physic_motor.py
@@ -16,15 +16,30 @@ class PhysicMotor:
         # print(pac_x, pac_y, self.pacmap.get_tile(pac_x, pac_y))
         # print("next:", self.pacmap.get_tile(pac_x + self.pacman.direction[0], pac_y + self.pacman.direction[1]))
 
-        if self.pacman.direction in (direction.up, direction.down):
-            if self.pacman.position[1]  % pac_res == pac_res / 2: # change this in the future
-                if self.pacmap.get_tile(*next_pac_tile) in (PhysTile.GRD, PhysTile.TPT):
-                    self.pacman.move()
-            else:
+        # if self.pacman.direction in (direction.up, direction.down):
+        #     if self.pacman.position[1]  % pac_res == pac_res / 2:
+        #         if self.pacmap.get_tile(self.pacman.get_next_dir_tile()) in (PhysTile.GRD, PhysTile.TPT):
+        #             self.pacman.change_to_next_dir()
+        #             self.pacman.move()
+        #         elif self.pacmap.get_tile(*next_pac_tile) in (PhysTile.GRD, PhysTile.TPT):
+        #             self.pacman.move()
+        #     else:
+        #         self.pacman.move()
+        # else:
+        #     if self.pacman.position[0] % pac_res == pac_res / 2:
+        #         if self.pacmap.get_tile(self.pacman.get_next_dir_tile()) in (PhysTile.GRD, PhysTile.TPT):
+        #             self.pacman.change_to_next_dir()
+        #             self.pacman.move()
+        #         elif self.pacmap.get_tile(*next_pac_tile) in (PhysTile.GRD, PhysTile.TPT):
+        #             self.pacman.move()
+        #     else:
+        #         self.pacman.move()
+
+        if self.pacman.is_at_center_tile():
+            if self.pacman.next_direction != direction.none and self.pacmap.get_tile(*self.pacman.get_next_dir_tile()) in (PhysTile.GRD, PhysTile.TPT):
+                self.pacman.change_to_next_dir()
                 self.pacman.move()
-        else:
-            if self.pacman.position[0] % pac_res == pac_res / 2: # change this in the future
-                if self.pacmap.get_tile(*next_pac_tile) in (PhysTile.GRD, PhysTile.TPT):
+            elif self.pacmap.get_tile(*next_pac_tile) in (PhysTile.GRD, PhysTile.TPT):
                     self.pacman.move()
-            else:
-                self.pacman.move()
\ No newline at end of file
+        else:
+            self.pacman.move()
\ No newline at end of file