char board[3][3] = { {'1','2','3'}, {'4','5','6'}, {'7','8','9'} };
char currentPlayer = 'X';
int moves = 0;

void setup() {
  Serial.begin(9600);
  printBoard();
  Serial.println("Player X, enter a position (1-9):");
}

void loop() {
  if (Serial.available() > 0) {
    char input = Serial.read();
    if (input >= '1' && input <= '9') {
      int pos = input - '1';
      int row = pos / 3;
      int col = pos % 3;

      if (board[row][col] != 'X' && board[row][col] != 'O') {
        board[row][col] = currentPlayer;
        moves++;
        printBoard();
        
        if (checkWin()) {
          Serial.print("Player "); Serial.print(currentPlayer); Serial.println(" wins!");
          resetGame();
        } else if (moves == 9) {
          Serial.println("It's a draw!");
          resetGame();
        } else {
          currentPlayer = (currentPlayer == 'X') ? 'O' : 'X';
          Serial.print("Player "); Serial.print(currentPlayer); Serial.println(", your turn:");
        }
      }
    }
  }
}

void printBoard() {
  for (int i = 0; i < 3; i++) {
    for (int j = 0; j < 3; j++) {
      Serial.print(board[i][j]);
      if (j < 2) Serial.print(" | ");
    }
    Serial.println();
    if (i < 2) Serial.println("---------");
  }
}

bool checkWin() {
  for (int i = 0; i < 3; i++) {
    if (board[i][0] == board[i][1] && board[i][1] == board[i][2]) return true; // Rows
    if (board[0][i] == board[1][i] && board[1][i] == board[2][i]) return true; // Cols
  }
  if (board[0][0] == board[1][1] && board[1][1] == board[2][2]) return true; // Diagonals
  if (board[0][2] == board[1][1] && board[1][1] == board[2][0]) return true;
  return false;
}

void resetGame() {
  char start = '1';
  for (int i = 0; i < 3; i++) {
    for (int j = 0; j < 3; j++) board[i][j] = start++;
  }
  moves = 0;
  currentPlayer = 'X';
  Serial.println("\nNew Game! Player X start:");
  printBoard();
}