Decreasing EXE Size - c

Question

I wrote a TicTacToe program in C that reads 68.3 KB on my hard disk, and I was wondering if there are any sort of optimization techniques I could use to decrease the amount of bytes in my .exe file.
For instance, is there anything in my code that I could change to make the resulting executable "smaller"?
Code:
#include <stdio.h>
#include <stdbool.h>
void drawBoard(int [3][3]);
bool boardFull(int [3][3]);
bool checkWin(int [3][3], int);
int main()
{
int board[3][3];
int marker, turn, row, column, i, j;
for(i = 0; i < 3; i++)
{
for(j = 0; j < 3; j++)
board[i][j] = -1;
}
printf("Player One is X\n");
printf("Player Two is O\n");
drawBoard(board);
while(!boardFull(board))
{
if((turn % 2) == 0)
{
printf("Player One's turn.\n");
marker = 1;
}
else
{
printf("Player Two's turn.\n");
marker = 0;
}
printf("Which row? ");
scanf("%i", &row);
printf("Which column? ");
scanf("%i", &column);
if(board[row - 1][column - 1] != -1)
{
while(board[row - 1][column - 1] != -1)
{
printf("Space already taken. Try again.\n");
printf("Which row? ");
scanf("%i", &row);
printf("Which column? ");
scanf("%i", &column);
printf("\n");
}
}
board[row - 1][column - 1] = marker;
drawBoard(board);
if(checkWin(board, marker))
{
if(marker == 1)
printf("Player One wins!!");
else
printf("Player Two wins!!");
return 0;
}
turn++;
}
printf("Cat's game!\n");
return 0;
}
void drawBoard(int board[3][3])
{
int i, j;
printf("\n");
for(i = 0; i < 3; i++)
{
printf(" ");
for(j = 0; j < 3; j++)
{
if(board[i][j] == 0)
printf("O");
else if(board[i][j] == 1)
printf("X");
else
printf(" ");
if(j == 2)
continue;
else
printf(" | ");
}
if(i == 2)
printf("\n\n");
else
printf("\n -----------\n");
}
}
bool boardFull(int board[3][3])
{
int i, j;
for(i = 0; i < 3; i++)
{
for(j = 0; j < 3; j++)
{
if(board[i][j] == -1)
return false;
}
}
return true;
}
bool checkWin(int board[3][3], int w)
{
return
board[0][0] == w && board[1][1] == w && board[2][2] == w
|| board[0][2] == w && board[1][1] == w && board[2][1] == w
|| board[0][0] == w && board[1][0] == w && board[2][0] == w
|| board[0][1] == w && board[1][1] == w && board[2][1] == w
|| board[0][2] == w && board[1][2] == w && board[2][2] == w
|| board[0][0] == w && board[0][1] == w && board[2][2] == w
|| board[1][0] == w && board[1][1] == w && board[2][2] == w
|| board[2][0] == w && board[2][1] == w && board[2][2] == w;
}