diff --git a/bin/back b/bin/back
index cd86c65..39a460a 100755
Binary files a/bin/back and b/bin/back differ
diff --git a/src/display.c b/src/display.c
index a265f5a..9153fe5 100644
--- a/src/display.c
+++ b/src/display.c
@@ -196,5 +196,5 @@ void drawHashToRenderer(SDL_Renderer* renderer, int chx, int chy, int xmin, int
 
 void drawMapToRenderer(SDL_Renderer* renderer, int xmin, int xmax, int ymin, int ymax) {
     drawHashToRenderer(renderer, player_cx, player_cy, xmin, xmax, ymin, ymax, 0, 0);
-    placeRectToRenderer(renderer, __width__ /2 - 5, __height__ /2 + 5, 10, 10, 255, 255, 32, SDL_ALPHA_OPAQUE);
+    placeRectToRenderer(renderer, __width__ /2 - 5*zoom/100, __height__ /2 - 5*zoom/100, 10*zoom/100, 10*zoom/100, 255, 255, 32, SDL_ALPHA_OPAQUE);
 }
\ No newline at end of file
diff --git a/src/main.c b/src/main.c
index f688285..4aab574 100644
--- a/src/main.c
+++ b/src/main.c
@@ -43,7 +43,7 @@ int main(int argc, char** argv) {
 
     /* -------------------------------------------------------- */
     //one_debug();
-    parse_configs("templates.txt", 48);
+    parse_configs("templates.txt", 47);
 
     initialize(rend);
 
diff --git a/src/move.c b/src/move.c
index 09c4d09..4133680 100644
--- a/src/move.c
+++ b/src/move.c
@@ -21,24 +21,75 @@
 double speed = 0.5 ;
 int precision = 12 ;
 
-double epsilon_x = 0.0;
-double epsilon_y = 0.0;
+double εx = 0.0;
+double εy = 0.0;
 
 bool checkCollision() {
     return (unpack_coord(gridGet(map, player_cx, player_cy)->chdata.lines, player_x, player_y));
 }
 
+bool checkCollision2(int cx, int cy, int x, int y) {
+    return (unpack_coord(gridGet(map, cx, cy)->chdata.lines, x, y));
+}
+
+void normalize(int* ch_coord, int* coord, double* ε) {
+    if(*ε >= 1.0) {
+        *ε -= 1.0 ;
+        *coord += 1 ;
+        if(*coord >= 8) {
+            *coord -= 8 ;
+            *ch_coord += 1;
+        }
+    } else if(*ε < 0.0) {
+        *ε += 1.0 ;
+        *coord -= 1 ;
+        if(*coord < 0) {
+            *coord += 8 ;
+            *ch_coord -= 1;
+        }
+    }
+}
+
+bool checkCollisionSquare(double square_size) {
+    double εxmin = εx - square_size;
+    double εxmax = εx + square_size;
+    double εymin = εy - square_size;
+    double εymax = εy + square_size;
+
+    int xmin = player_x ;
+    int xmax = player_x ;
+    int ymin = player_y ;
+    int ymax = player_y ;
+
+    int cxmin = player_cx ;
+    int cxmax = player_cx ;
+    int cymin = player_cy ;
+    int cymax = player_cy ;
+
+    normalize(&cxmin, &xmin, &εxmin);
+    normalize(&cxmax, &xmax, &εxmax);
+    normalize(&cymin, &ymin, &εymin);
+    normalize(&cymax, &ymax, &εymax);
+
+    return (
+        checkCollision2(cxmin, cymin, xmin, ymin) ||
+        checkCollision2(cxmin, cymax, xmin, ymax) ||
+        checkCollision2(cxmax, cymin, xmax, ymin) ||
+        checkCollision2(cxmax, cymax, xmax, ymax)
+    );
+}
+
 void increment_x(double dx) {
-    epsilon_x = epsilon_x + dx ;
-    if(epsilon_x >= 1.0) {
-        epsilon_x -= 1.0 ;
+    εx = εx + dx ;
+    if(εx >= 1.0) {
+        εx -= 1.0 ;
         player_x += 1 ;
         if(player_x >= 8) {
             player_x -= 8 ;
             player_cx += 1;
         }
-    } else if(epsilon_x < 0.0) {
-        epsilon_x += 1.0 ;
+    } else if(εx < 0.0) {
+        εx += 1.0 ;
         player_x -= 1 ;
         if(player_x < 0) {
             player_x += 8 ;
@@ -48,16 +99,16 @@ void increment_x(double dx) {
 }
 
 void increment_y(double dy) {
-    epsilon_y += dy ;
-    if(epsilon_y >= 1.0) {
-        epsilon_y -= 1.0 ;
+    εy += dy ;
+    if(εy >= 1.0) {
+        εy -= 1.0 ;
         player_y += 1 ;
         if(player_y >= 8) {
             player_y -= 8 ;
             player_cy += 1;
         }
-    } else if(epsilon_y < 0.0) {
-        epsilon_y += 1.0 ;
+    } else if(εy < 0.0) {
+        εy += 1.0 ;
         player_y -= 1 ;
         if(player_y < 0) {
             player_y += 8 ;
@@ -69,7 +120,7 @@ void increment_y(double dy) {
 bool moveRequest(double dx, double dy) {
     increment_x(dx);
     increment_y(dy);
-    if(false && checkCollision()) {
+    if(checkCollisionSquare(0.15)) {
         increment_x(-dx);
         increment_y(-dy);
         return false;
@@ -125,13 +176,13 @@ void moveFunctionMaster(SDL_Renderer* renderer) {
     while(!halt) {
         moveControl(&halt);
         resetRenderer(renderer);
-        drawMapToRenderer(renderer, -300 * 250/zoom + to_int(50 * (8*player_cx + player_x + epsilon_x)), 300 * 250/zoom + to_int(50 * (8*player_cx + player_x + epsilon_x)), -300 * 250/zoom + to_int(50 * (8*player_cy + player_y + epsilon_y)), 300 * 250/zoom + to_int(50 * (8*player_cy + player_y + epsilon_y)));
+        drawMapToRenderer(renderer, -300 * 250/zoom + to_int(50 * (8*player_cx + player_x + εx)), 300 * 250/zoom + to_int(50 * (8*player_cx + player_x + εx)), -300 * 250/zoom + to_int(50 * (8*player_cy + player_y + εy)), 300 * 250/zoom + to_int(50 * (8*player_cy + player_y + εy)));
         drawNumberToRenderer(renderer, digits, player_cx, 10, 10, 50, 70, 0);
         drawNumberToRenderer(renderer, digits, player_cy, 10, 80, 50, 70, 0);
         drawNumberToRenderer(renderer, digits, player_x, __width__ / 3, 10, 50, 70, 0);
         drawNumberToRenderer(renderer, digits, player_y, __width__ / 3, 80, 50, 70, 0);
-        drawNumberToRenderer(renderer, digits, to_int(epsilon_x*100), 2 * __width__ / 3, 10, 50, 70, 0);
-        drawNumberToRenderer(renderer, digits, to_int(epsilon_y*100), 2 * __width__ / 3, 80, 50, 70, 0);
+        drawNumberToRenderer(renderer, digits, to_int(εx*100), 2 * __width__ / 3, 10, 50, 70, 0);
+        drawNumberToRenderer(renderer, digits, to_int(εy*100), 2 * __width__ / 3, 80, 50, 70, 0);
         updateRenderer(renderer);
         draw_par += 1 ;
         usleep(20000);
diff --git a/src/move.h b/src/move.h
index f854453..0887dcd 100644
--- a/src/move.h
+++ b/src/move.h
@@ -3,6 +3,12 @@
 
 bool checkCollision();
 
+bool checkCollision2(int cx, int cy, int x, int y);
+
+void normalize(int* ch_coord, int* coord, double* ε);
+
+bool checkCollisionSquare(double square_size);
+
 void increment_x(double dx);
 
 void increment_y(double dy);
diff --git a/src/structure.h b/src/structure.h
index efa4e0b..b33afd8 100644
--- a/src/structure.h
+++ b/src/structure.h
@@ -22,8 +22,8 @@ extern int render_distance ;
 extern double speed ;
 extern int precision ;
 
-extern double epsilon_x ;
-extern double epsilon_y ;
+extern double εx ;
+extern double εy ;
 // are in [0.0, 1.0[
 
 extern int player_x ;
diff --git a/templates.txt b/templates.txt
index c25b563..503453b 100644
--- a/templates.txt
+++ b/templates.txt
@@ -223,15 +223,6 @@
 0 0 1 0 0 1 0 0
 1 1 1 0 0 1 1 1
 
-1 1 1 0 0 1 1 1
-0 0 1 0 0 1 1 1
-1 0 0 0 0 0 0 1
-1 0 0 1 1 0 0 0
-1 0 0 1 1 0 0 0
-1 0 0 0 0 0 0 1
-0 0 1 0 0 1 1 1
-1 1 1 0 0 1 1 1
-
 1 1 1 1 1 1 1 1
 0 0 1 0 0 1 1 1
 1 0 0 0 0 0 0 1