smartmove() function to determine winning possibilities not functioning - c++

Question

I'm making a tic tac toe program. Right now, the two player option hasn't been created, but I will have no problem with that. My current issue is working on the bot function. Essentially, it's got 2 main ways of going about: botmove() where a random number is generated and it places its piece based on that number, of course testing that it is unoccupies, and smartmove() which is the function im struggling with. I've essentially given it an algoritm to test any win conditions (horizontal, vertical, and diagonal) and told it that, if it detects one, to place its piece to prevent loss. I have a " ..." and pause for a second to give it some time as well as to see whether or not its using smartmove() or botmove(). When you run the program, if the bot encounters a possible smartmove, it simply does nothing and moves onto the user's next term.
Here's the whole program, but main() and smartmove() are here for convenience.
Here's my main():
int main() {
char replaya;
replaya = 'y';
intro();
while (replaya == 'y' || replaya == 'Y') {
char friendorbota;
friendorbota = friendorbot();
if (friendorbota == 'f' || friendorbota == 'F') {
cout << "friend";
}
else if (friendorbota == 'b' || friendorbota == 'B') {
char arr[9] = { ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ' };
//1
placepiece(arr);
if (determinewin(arr) == true) {
replaya = replay();
}
if (isFilled(arr) == true) {
replaya = replay();
}
//2
smartmove(arr);
if (determinewin(arr) == true) {
replaya = replay();
}
if (isFilled(arr) == true) {
replaya = replay();
}
//3
placepiece(arr);
if (determinewin(arr) == true) {
replaya = replay();
}
if (isFilled(arr) == true) {
replaya = replay();
}
//4
smartmove(arr);
if (determinewin(arr) == true) {
replaya = replay();
}
if (isFilled(arr) == true) {
replaya = replay();
}
//5
placepiece(arr);
if (determinewin(arr) == true) {
replaya = replay();
}
if (isFilled(arr) == true) {
replaya = replay();
}
//6
smartmove(arr);
if (determinewin(arr) == true) {
replaya = replay();
}
if (isFilled(arr) == true) {
replaya = replay();
}
//7
placepiece(arr);
if (determinewin(arr) == true) {
replaya = replay();
}
if (isFilled(arr) == true) {
replaya = replay();
}
//8
smartmove(arr);
if (determinewin(arr) == true) {
replaya = replay();
}
if (isFilled(arr) == true) {
replaya = replay();
}
//9
placepiece(arr);
if (determinewin(arr) == true) {
replaya = replay();
}
if (isFilled(arr) == true) {
replaya = replay();
}
}
cout << "\nThanks for playing!\n";
exit(0);
}
}
And my smartmove():
void smartmove(char arr[9]) {
this_thread::sleep_for(chrono::milliseconds(500));
cout << "\n\n . . . \n\n";
this_thread::sleep_for(chrono::milliseconds(500));
// Check if player has two in a row
for (int i = 0; i < 9; i += 3) {
if (arr[i] == 'X' && arr[i + 1] == 'X' && arr[i + 2] == ' ') {
arr[i + 2] = 'O';
return;
}
else if (arr[i] == 'X' && arr[i + 1] == ' ' && arr[i + 2] == 'X') {
arr[i + 1] = 'O';
return;
}
else if (arr[i] == ' ' && arr[i + 1] == 'X' && arr[i + 2] == 'X') {
arr[i] = 'O';
return;
}
}
// Check if player has two in a column
for (int i = 0; i < 3; i++) {
if (arr[i] == 'X' && arr[i + 3] == 'X' && arr[i + 6] == ' ') {
arr[i + 6] = 'O';
return;
}
else if (arr[i] == 'X' && arr[i + 3] == ' ' && arr[i + 6] == 'X') {
arr[i + 3] = 'O';
return;
}
else if (arr[i] == ' ' && arr[i + 3] == 'X' && arr[i + 6] == 'X') {
arr[i] = 'O';
return;
}
}
// Check if player has two in a diagonal
if (arr[0] == 'X' && arr[4] == 'X' && arr[8] == ' ') {
arr[8] = 'O';
}
else if (arr[0] == 'X' && arr[4] == ' ' && arr[8] == 'X') {
arr[4] = 'O';
}
else if (arr[0] == ' ' && arr[4] == 'X' && arr[8] == 'X') {
arr[0] = 'O';
}
else if (arr[2] == 'X' && arr[4] == 'X' && arr[6] == ' ') {
arr[6] = 'O';
}
else if (arr[2] == 'X' && arr[4] == ' ' && arr[6] == 'X') {
arr[4] = 'O';
}
else if (arr[2] == ' ' && arr[4] == 'X' && arr[6] == 'X') {
arr[2] = 'O';
}
else {
// Default to botmove() if no smart move is available
botmove(arr);
}
}
I've tested every function to ensure that everything is working fine, and I know that my main function could probably be organized a bit better but I wanted it as simple as possible while trying to solve this smartmove() issue. I've tested every function to ensure that everything is working fine other than smartmove(), so it seems like the only issue is with smartmove() or main() to my knowledge, although I've included all of the code in the link. And yes, I've done debugging by myself of every single section and both visual studio.