diff --git a/ttt.cc b/ttt.cc
index 45e9c84..2afdd29 100644
--- a/ttt.cc
+++ b/ttt.cc
@@ -1,26 +1,17 @@
 #include <iostream>
 #include <string>
+#include <vector>
+#include <climits>
 
 using namespace std;
 
-
-const int ROWS = 3;
-const int COLUMNS = 3;
-
-/* Grid representing the tic-tac-toe field.
-   0  is empty,
-   1  is human,
-   -1 is computer.
-*/
-int grid[COLUMNS][ROWS];
-
-void printGrid() {
-  for (int y = 0; y < ROWS; y++) {
-    for (int x = 0; x < 2 * COLUMNS + 1; x++) {
+void print_grid(const int dimension, vector<vector<int>> &grid) {
+  for (int y = 0; y < dimension; y++) {
+    for (int x = 0; x < 2 * dimension + 1; x++) {
       cout << '-';
     }
     cout << endl;
-    for (int x = 0; x < COLUMNS; x++) {
+    for (int x = 0; x < dimension; x++) {
       if (x == 0) {
         cout << '|';
       }
@@ -34,8 +25,8 @@ void printGrid() {
       cout << '|';
     }
     cout << endl;
-    if (y == COLUMNS - 1) {
-      for (int x = 0; x < 2 * COLUMNS + 1; x++) {
+    if (y == dimension - 1) {
+      for (int x = 0; x < 2 * dimension + 1; x++) {
         cout << '-';
       }
       cout << endl;
@@ -43,6 +34,104 @@ void printGrid() {
   }
 }
 
+int *minimax(const int dimension, vector<vector<int>> &grid) {
+  return 0;
+}
+
+int max(const int dimension, vector<vector<int>> &grid, int &x, int &y) {
+  int n = game_over(dimension, grid);
+  if (n == 2) return 0;
+  else if (n == 1) return 1;
+  else if (n == -1) return -1;
+
+  int value = INT_MIN;
+  for (int y = 0; y < dimension; y++) {
+    for (int x = 0; x < dimension; x++) {
+      if (grid[y][x] != 0) continue;
+      grid[y][x] = 1;
+      
+    }
+  }
+}
+
+void min(const int dimension, vector<vector<int>> &grid, int &x, int &y) {
+  int value = INT_MAX;
+
+}
+
+/*
+Check if game is over.
+returns:
+-1 if bot won
+0  if game is not over
+1  if player won
+2  if tie
+*/
+int game_over(const int dimension, vector<vector<int>> &grid) {
+  // check rows
+  for (int y = 0; y < dimension; y++) {
+    int sum = 0;
+    for (int x = 0; x < dimension; x++) {
+      sum += grid[x][y];
+    }
+    if (sum == dimension) {
+      return 1;
+    } else if (sum == -dimension) {
+      return -1;
+    }
+    sum = 0;
+  }
+
+  // check columns
+  for (int x = 0; x < dimension; x++) {
+    int sum = 0;
+    for (int y = 0; y < dimension; y++) {
+      sum += grid[x][y];
+    }
+    if (sum == dimension) {
+      cout << "player won" << endl;
+      return 1;
+    } else if (sum == -dimension) {
+      cout << "bot won" << endl;
+      return -1;
+    }
+    sum = 0;
+  }
+
+  // check first diagonal
+  int sum = 0;
+  for (int n = 0; n < dimension; n++) {
+    sum += grid[n][n];
+  }
+  if (sum == dimension) {
+    cout << "player won" << endl;
+    return 1;
+  } else if (sum == -dimension) {
+    cout << "bot won" << endl;
+    return -1;
+  }
+
+  // check second diagonal
+  sum = 0;
+  for (int n = 1; n <= dimension; n++) {
+    sum += grid[dimension - n][n - 1];
+  }
+  if (sum == dimension) {
+    cout << "player won" << endl;
+    return 1;
+  } else if (sum == -dimension) {
+    cout << "bot won" << endl;
+    return -1;
+  }
+
+  // check if grid is full
+  for (int y = 0; y < dimension; y++) {
+    for (int x = 0; x < dimension; x++) {
+      if (grid[x][y] == 0) return 0;
+    }
+  }
+  return 2;
+}
 
 bool parse_move(string move, int &x, int &y) {
   // split string on comma
@@ -73,41 +162,51 @@ bool parse_move(string move, int &x, int &y) {
   return false;
 }
 
-void player_move() {
+void player_move(const int dimension, vector<vector<int>> &grid) {
   string move;
   int x;
   int y;
   while (true) {
+    print_grid(dimension, grid);
     cout << "Enter a valid move. (Format is 'x,y')" << endl;
     cin >> move;
     if (!parse_move(move, x, y)) {
       cout << "Couldn't parse move." << endl;
       continue;
     }
-    if (x < 0 || y < 0 || x >= COLUMNS || y >= ROWS) {
+    if (x < 0 || y < 0 || x >= dimension || y >= dimension) {
       cout << "Coordinates out of bounds." << endl;
       continue;
     }
     break;
   }
-  grid[x][y] = '1';
+  grid[x][y] = 1;
 }
 
 void computer_move() {
 }
 
-bool game_over() {
-  return false;
-}
 
 /* Play one game of tic tac toe, 
 /* returns 0 if the player won and 1 if the computer won. 
 */
-int play_game() {
+int play_game(const int dimension) {
+  /* Grid representing the tic-tac-toe field.
+    0  is empty,
+    1  is human,
+    -1 is computer.
+  */
+  vector<vector<int>> grid;
+  for (int y = 0; y < dimension; y++) {
+    grid.push_back({});
+    for (int x = 0; x < dimension; x++) {
+      grid[y].push_back(0);
+    }
+  }
   // Query for starting player
   int startPlayer = -1;
   while (startPlayer != 0 && startPlayer != 1) {
-    cout << "Which player should start? (0 - You, 1 - Program)";
+    cout << "Which player should start? (0 - You, 1 - Program)" << endl;
     cin >> startPlayer;
   }
 
@@ -117,10 +216,10 @@ int play_game() {
   }
 
   while(true) {
-    player_move();
-    if (game_over()) break;
+    player_move(dimension, grid);
+    if (game_over(dimension, grid) != 0) break;
     computer_move();
-    if (game_over()) break;
+    if (game_over(dimension, grid) != 0) break;
   }
 
 
@@ -128,12 +227,12 @@ int play_game() {
 }
 
 int main(int argc, char *argv[]) {
-  cout << "Hello world" << endl;
-  for (int y = 0; y < ROWS; y++) {
-    for (int x = 0; x < COLUMNS; x++) {
-      grid[x][y] = 1;
-    }
-  }
-  printGrid();
-  player_move();
+  // for (int y = 0; y < DIMENSION; y++) {
+  //   for (int x = 0; x < DIMENSION; x++) {
+  //     grid[x][y] = 1;
+  //   }
+  // }
+
+  play_game(3);
+
 }
\ No newline at end of file