int CApp::CheckWin()
{
    if(Grid[0] == Grid[1] && Grid[1] == Grid[2])
        return Grid[0];
    if(Grid[0] == Grid[3] && Grid[3] == Grid[6])
        return Grid[0];
    if(Grid[0] == Grid[4] && Grid[4] == Grid[8])
        return Grid[0];
    if(Grid[1] == Grid[4] && Grid[4] == Grid[7])
        return Grid[1];
    if(Grid[2] == Grid[4] && Grid[4] == Grid[6])
        return Grid[2];
    if(Grid[2] == Grid[5] && Grid[5] == Grid[8])
        return Grid[2];
    if(Grid[3] == Grid[4] && Grid[4] == Grid[5])
        return Grid[3];
    if(Grid[6] == Grid[7] && Grid[7] == Grid[8])
        return Grid[6];
}