diff --git a/answer.txt b/answer.txt
index ddb2ade..5c406b3 100644
--- a/answer.txt
+++ b/answer.txt
@@ -1 +1 @@
-265 80
\ No newline at end of file
+155 80
\ No newline at end of file
diff --git a/bin/back b/bin/back
index 9a71ad9..5baf2ce 100755
Binary files a/bin/back and b/bin/back differ
diff --git a/leaderboard.txt b/leaderboard.txt
new file mode 100644
index 0000000..5dd5ff8
--- /dev/null
+++ b/leaderboard.txt
@@ -0,0 +1,5 @@
+name, elo
+./bots/dumb 2154
+./bots/dumb 1000
+./bots/dumb 1500
+./bots/dumb 501
diff --git a/obj/base.o b/obj/base.o
index 8bae35a..a7b37aa 100644
Binary files a/obj/base.o and b/obj/base.o differ
diff --git a/obj/collisions.o b/obj/collisions.o
index 1335957..edf7bbe 100644
Binary files a/obj/collisions.o and b/obj/collisions.o differ
diff --git a/obj/main.o b/obj/main.o
index aa74258..7025d55 100644
Binary files a/obj/main.o and b/obj/main.o differ
diff --git a/obj/structure.o b/obj/structure.o
index 4f5069c..8d3e3c9 100644
Binary files a/obj/structure.o and b/obj/structure.o differ
diff --git a/output.txt b/output.txt
index 8bbca05..bacaecb 100644
--- a/output.txt
+++ b/output.txt
@@ -1,28 +1,13 @@
 4
-0 (4 0) (44.83 67.29)
-1 (2 0) (11.26 93.67)
-2 (1 3) (95.26 50.45)
-3 (1 3) (72.77 32.85)
-[1]
+0 (2 0) (32.28 87.09)
+1 (2 0) (83.34 49.89)
+2 (2 0) (81.67 74.71)
+3 (1 0) (79.36 63.40)
+[3]
 
-5 5
-..S14
-....0
-...35
-.E15.
-.....
+1 3
+S1E
 
-100
-200
-5
-0.90
-0.80
-0.20
+100 200 5 0.90 0.80 0.20
 
-
-Room Size
-Maximum speed
-Player Radius
-Friction
-Restitution factor
-Track Distance to Edge
+Room Size, Maximum speed, Player Radius, Friction, Restitution factor, Track Distance to Edge, 
\ No newline at end of file
diff --git a/src/base.c b/src/base.c
index e11d73f..3c9e350 100644
--- a/src/base.c
+++ b/src/base.c
@@ -17,6 +17,7 @@
 
 int* winners;
 int remainingTurns;
+int nextRank;
 
 int currentTurn;
 int nPlayers;
@@ -48,6 +49,7 @@ color assignColor() {
 
 void init_all(int nPl) {
     nPlayers = nPl;
+    nextRank = 1;
     RED = 255*(rand()%2);
     GREEN = 255*(rand()%2);
     BLUE = 255*(rand()%2);
diff --git a/src/collisions.c b/src/collisions.c
index 1a7b0c3..a7c4819 100644
--- a/src/collisions.c
+++ b/src/collisions.c
@@ -47,8 +47,8 @@ ptf get_absolute_coords(int nPl) {
 // -------------------------------------------------------------------------------- //
 // make the player move DT (does not take friction into consideration)
 
-// start and finish
-void move_on_ENDS(int nPl) {
+// start
+void move_on_START(int nPl) {
     car* c = players[nPl].c;
     c->pos.fx += c->vel.fx*DT;
     c->pos.fy += c->vel.fy*DT;
@@ -86,6 +86,41 @@ void move_on_ENDS(int nPl) {
     }
 }
 
+// finish
+void move_on_FINISH(int nPl) {
+    car* c = players[nPl].c;
+    c->pos.fx += c->vel.fx*DT;
+    c->pos.fy += c->vel.fy*DT;
+    if(
+        (c->pos.fx-PLAYER_R <= 0.0 && c->vel.fx < 0.0)
+    ) {         // left wall
+        c->vel.fx *= -1.0;
+        c->pos.fx += 2.0*c->vel.fx*DT;
+        c->vel.fx *= RESTITUTION_WALL;
+    }
+    if(
+        (c->pos.fx+PLAYER_R >= 1.0*ROOM_SIZE && c->vel.fx > 0.0)
+    ) {         // right wall
+        c->vel.fx *= -1.0;
+        c->pos.fx += 2.0*c->vel.fx*DT;
+        c->vel.fx *= RESTITUTION_WALL;
+    }
+    if(
+        (c->pos.fy-PLAYER_R <= 0.0 && c->vel.fy < 0.0)
+    ) {         // top wall
+        c->vel.fy *= -1.0;
+        c->pos.fy += 2.0*c->vel.fy*DT;
+        c->vel.fy *= RESTITUTION_WALL;
+    }
+    if(
+        (c->pos.fy+PLAYER_R >= 1.0*ROOM_SIZE && c->vel.fy > 0.0)
+    ) {         // bottom wall
+        c->vel.fy *= -1.0;
+        c->pos.fy += 2.0*c->vel.fy*DT;
+        c->vel.fy *= RESTITUTION_WALL;
+    }
+}
+
 void move_on_STR_V(int nPl) {
     car* c = players[nPl].c;
     c->pos.fx += c->vel.fx*DT;
@@ -197,8 +232,14 @@ bool updateCar(level* lvl, int nPl) {
                 return false;
 
             case START:
+                move_on_START(nPl);
+                bumpOtherCars(nPl);
+                apply_friction(nPl);
+                updateChunk(nPl);
+                return true;
+
             case END:
-                move_on_ENDS(nPl);
+                move_on_FINISH(nPl);
                 bumpOtherCars(nPl);
                 apply_friction(nPl);
                 updateChunk(nPl);
@@ -254,10 +295,14 @@ bool updateCar(level* lvl, int nPl) {
     }
 }
 
-void hasWon(int nPl) {
+void hasWon(int nPl, int* ranks, int* incr) {
     if(0==winners[nPl]) {
         car* c = players[nPl].c;
         winners[nPl] = ((c->chx == FINISH_CHY && c->chy == FINISH_CHX)?(1):(0));
+        if(winners[nPl]==1 && ranks[nPl] == nPlayers) {
+            ranks[nPl] = nextRank;
+            *incr += 1;
+        }
         if(winners[nPl]==1 && remainingTurns == -1) {
             remainingTurns = 4;
         }
@@ -265,10 +310,12 @@ void hasWon(int nPl) {
     
 }
 
-void updateWins() {
+void updateWins(int* ranks) {
+    int incr = 0;
     for(int p = 0; p < nPlayers; p++) {
-        hasWon(p);
+        hasWon(p, ranks, &incr);
     }
+    nextRank += incr;
 }
 
 // return true if at least one car moved
diff --git a/src/collisions.h b/src/collisions.h
index 1c4badf..27d4baa 100644
--- a/src/collisions.h
+++ b/src/collisions.h
@@ -2,6 +2,6 @@
 #define COLLISIONS_H
 
 bool updateCars(level* lvl);
-void updateWins();
+void updateWins(int* ranks);
 
 #endif
\ No newline at end of file
diff --git a/src/main.c b/src/main.c
index c7cddd5..18ae0c9 100644
--- a/src/main.c
+++ b/src/main.c
@@ -19,6 +19,7 @@
 #include "cars.h"
 
 bool WAIT = true;
+bool matchDone = false;
 
 void cameraActions(level* lvl, bool* halt, int* cx, int* cy, int* dezoom, int* sizeR) {
     SDL_Event event;
@@ -100,7 +101,9 @@ int main(int argc, char** argv) {
     int N_PLAYERS = argc-2;
 
     char** execs = malloc(sizeof(char*)*N_PLAYERS);
+    int* ranks = malloc(sizeof(int)*N_PLAYERS);
     for(int k = 0; k < N_PLAYERS; k++) {
+        ranks[k] = N_PLAYERS;
         execs[k] = malloc(sizeof(char)*64);
         execs[k][0] = '.';
         execs[k][1] = '/';
@@ -160,6 +163,8 @@ int main(int argc, char** argv) {
     int cy = START_CHY;
     int dezoom = 2;
     int sizeR = 200;
+
+    int count = 0;
     while(!halt) {
         resetRenderer(rend);
         renderMap(rend, stage, pth, cx, cy, dezoom, sizeR);
@@ -187,11 +192,12 @@ int main(int argc, char** argv) {
         } else {
             // no movement
             placeRectToRenderer(rend, 0, HEIGHT-50, 50, 50, 255, 32, 32, 192);
-            updateWins();
+            updateWins(ranks);
             if(remainingTurns != 0)parse_all_players(stage, execs);
             if(remainingTurns > 0) {
                 remainingTurns -= 1;
                 if(remainingTurns == 0) {
+                    matchDone = true;
                     //halt = true;
                 }
             }
@@ -204,10 +210,12 @@ int main(int argc, char** argv) {
         }
         updateRenderer(rend);
         elapsed += DT;
-        if(WAIT)usleep((int)(1000000*(DT/4)));
+        if(WAIT && count%3==0)usleep((int)(1000000*DT));
         cameraActions(stage, &halt, &cx, &cy, &dezoom, &sizeR);
+        count += 1;
     }
     
+    if(matchDone)updateLeaderBoard(execs, ranks);
     // ---------------------------- //
     free_digits(digits);
     free_digits(letters);
@@ -218,6 +226,8 @@ int main(int argc, char** argv) {
     }
     free(execs);
 
+    free(ranks);
+
     SDL_DestroyRenderer(rend);
     SDL_DestroyWindow(win);
     SDL_Quit();
diff --git a/src/structure.c b/src/structure.c
index a763d62..02b83f1 100644
--- a/src/structure.c
+++ b/src/structure.c
@@ -1,4 +1,6 @@
 #include <stdio.h>
+#include <stdbool.h>
+#include <math.h>
 #include <SDL2/SDL.h>
 #include <SDL2/SDL_image.h>
 #include "structure.h"
@@ -61,12 +63,80 @@ void write_output(char* stream, level* lvl, int nPl) {
         fprintf(ptr, "\n");
     }
     fprintf(ptr, "\n");
-    fprintf(ptr, "%d\n", ROOM_SIZE);
-    fprintf(ptr, "%d\n", MAX_SPEED);
-    fprintf(ptr, "%d\n", PLAYER_R);
-    fprintf(ptr, "%.2lf\n", FRICTION);
-    fprintf(ptr, "%.2lf\n", RESTITUTION_WALL);
-    fprintf(ptr, "%.2lf\n", DIST_EDGE);
-    fprintf(ptr, "\n\nRoom Size\nMaximum speed\nPlayer Radius\nFriction\nRestitution factor\nTrack Distance to Edge\n");
+    fprintf(ptr, "%d %d %d %.2lf %.2lf %.2lf\n", ROOM_SIZE, MAX_SPEED, PLAYER_R, FRICTION, RESTITUTION_WALL, DIST_EDGE);
+    fprintf(ptr, "\nRoom Size, Maximum speed, Player Radius, Friction, Restitution factor, Track Distance to Edge, ");
     fclose(ptr);
+}
+
+// ------------------------- //
+
+bool str_equal(char* s1, char* s2) {
+    if(s1[0] == '\0' || s2[0] == '\0') {
+        return (s1[0] == '\0' && s2[0] == '\0');
+    } else if(s1[0] != s2[0]) {
+        return false;
+    }
+    return str_equal(&s1[1], &s2[1]);
+}
+
+int gains(int elo, int rank) {
+    return (int)(
+        60*exp(-elo*((rank-1.0)/(nPlayers-1.0))/1200.0)-34
+    );
+}
+
+void updateLeaderBoard(char** execs, int* ranks) {
+    FILE* ptr = fopen("leaderboard.txt", "r");
+    FILE* ptrOut = fopen("tempLeader.txt", "w");
+
+    // ignore first line
+    char c = fgetc(ptr);
+    while(c != EOF && c != '\n') {
+        fprintf(ptrOut, "%c", c);
+        c = fgetc(ptr);
+    }
+    fprintf(ptrOut, "\n");
+
+    bool* found = malloc(sizeof(bool)*nPlayers);
+    char* entry = malloc(sizeof(char)*64);
+    int elo;
+    int res = fscanf(ptr, "%s %d", entry, &elo);
+    while(res > 0) {
+        for(int p = 0; p < nPlayers; p++) {
+            if(!found[p] && str_equal(execs[p], entry)) {
+                found[p] = true;
+                printf("[%s - rank %d/%d] : %d -", execs[p], ranks[p], nPlayers, elo);
+                int de = gains(elo, ranks[p]);
+                printf("(%d)-> ", de);
+                elo += de;
+                printf("%d\n", elo);
+            }
+        }
+
+        fprintf(ptrOut, "%s %d\n", entry, elo);
+        res = fscanf(ptr, "%s %d\n", entry, &elo);
+    }
+    fclose(ptr);
+    fclose(ptrOut);
+
+    // copy data to main file
+    FILE* tempRead = fopen("tempLeader.txt", "r");
+    FILE* mainWrite = fopen("leaderboard.txt", "w");
+
+    c = fgetc(tempRead);
+    while(c != EOF) {
+        fprintf(mainWrite, "%c", c);
+        c = fgetc(tempRead);
+    }
+    for(int k = 0; k < nPlayers; k++) {
+        if(!found[k]) {
+            fprintf(mainWrite, "%s %d\n", execs[k], 500+gains(500, ranks[k]));
+        }
+    }
+
+    fclose(tempRead);
+    fclose(mainWrite);
+
+    free(entry);
+    free(found);
 }
\ No newline at end of file
diff --git a/src/structure.h b/src/structure.h
index 6ad0bf3..e99e9de 100644
--- a/src/structure.h
+++ b/src/structure.h
@@ -112,10 +112,12 @@ extern const double DELTA_V;
 extern const double DELTA_THETA;
 
 extern int* winners;
+extern int nextRank;
 extern int remainingTurns;
 
 // -------------------------------------------------------------------------------- //
 
 void write_output(char* stream, level* lvl, int nPl);
+void updateLeaderBoard(char** execs, int* ranks);
 
 #endif
\ No newline at end of file
diff --git a/tempLeader.txt b/tempLeader.txt
new file mode 100644
index 0000000..5dd5ff8
--- /dev/null
+++ b/tempLeader.txt
@@ -0,0 +1,5 @@
+name, elo
+./bots/dumb 2154
+./bots/dumb 1000
+./bots/dumb 1500
+./bots/dumb 501