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I've almost finished "fifteen". It works: outputs correct board from 3x3 to 9x9 with 'init'

void init(void)
{
int k = (d * d) - 1;
for (int j = 0; j < d; j++)
{
    for (int i = 0; i < d; i++)
    {
        board[i][j] = k;
        k--;
    }
}
if (d % 2 == 0)
{
    board[d - 2][d - 1] = 2;
    board[d - 3][d - 1] = 1;
}

} & 'draw' functions:

void draw(void)
{
for (int j = 0; j < d; j++)
{
    for (int i = 0; i < d; i++)
    {
        printf("%3i ", board[i][j]);
    }
    printf("\n\n");
}
}

It checks won with 3x3 & 4x4 tests,

bool won(void)
{
int res = 1;
for (int j = 0; j < d; j++)
{
    for (int i = 0; i < d; i++)
    {
        if(board[i][j] == res)
        {
            res++;
        }
        else if (res == d * d && board[i][j] == 0)
        {
            return true;
        }
    }
}
return false;
}

& swaps moving

bool move(int tile)
{
for (int j = 0; j < d; j++)
{
    for (int i = 0; i < d; i++)
    {
        if (board[i][j] == 0 && board[i - 1][j] == tile)
        {
            board[i - 1][j] = 0;
            board[i][j] = tile;
            return true;
        }
        else if (board[i][j] == 0 && board[i + 1][j] == tile)
        {
            board[i + 1][j] = 0;
            board[i][j] = tile;
            return true;
        }
        else if (board[i][j] == 0 && board[i][j - 1] == tile)
        {
            board[i][j - 1] = 0;
            board[i][j] = tile;
            return true;
        }
        else if (board[i][j] == 0 && board[i][j + 1] == tile)
        {
            board[i][j + 1] = 0;
            board[i][j] = tile;
            return true;
        }
    }
}
return false;
}

but still cannot pass through check50 with mistakes below

enter image description here

I suspect a logical error in one of the loops, but I can not catch it in any way. Will you poke my nose where to look for?

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I found! I was inattentive to the row-column order in the array and their variables in the loops!

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