Tic Tac Toe Heuristic

Tic Tac Toe Heuristic.cpp

#define Possible_Wins 8
const int Three_in_a_Row[Possible_Wins][3] = {
  { 0, 1, 2 },
  { 3, 4, 5 },
  { 6, 7, 8 },
  { 0, 3, 6 },
  { 1, 4, 7 },
  { 2, 5, 8 },
  { 0, 4, 8 },
  { 2, 4, 6 }
};
const int Heuristic_Array[4][4] = {
  {     0,   -10,  -100, -1000 },
  {    10,     0,     0,     0 },
  {   100,     0,     0,     0 },
  {  1000,     0,     0,     0 }
};

int evaluatePosition(char board[9], char player) {
  char opponent = (player == 'X') ? 'O' : 'X', piece;
  int players, others, t = 0, i, j;
  
  for (i = 0; i < 8; i++)  {
    players = others = 0;
    for (j = 0; j < 3; j++)  {
      piece = board[Three_in_a_Row[i][j]];
      if (piece == player)
        players++;
      else if (piece == opponent)
        others++;
    }
    t += Heuristic_Array[players][others];
  }
  return t;
}