user1315: As we know, castling is a legal "double move," where two pieces are moved at once. 
But in my country, Indonesia, in my childhood, the opening below was an 'assumed legal' double move to counter 1.e4 and similar openings.
[FEN "rnbqkbnr/p1pppp1p/1p1111p1/8/4P3/8/PPPP1PPP/RNBQKBNR - - - 0 0 "]

As I understand, this opening is an illegal double move. (Someone can help me with the FIDE rule.)
I would like to know, though, are such double moves played in any other place in the world??

user291: Castling is the only legal chess move in which two pieces are moved. You can verify this by searching for "FIDE Laws of Chess" and reading "Article 3: The moves of the pieces" (I do not provide the URL here because unfortunately it frequently changes).

user167: From your description, I'm not sure whether in your childhood games the sort of double move you showed above could only happen at that one point in the game, or could continue to happen. So I don't have much to say, but there is at least an established chess variant (dating back to the early 20th century) in which your indicated sequence of moves could occur legally.
The game is (Balanced) Marseillais Chess, in which White begins with a single move, but then each side alternates making two successive moves from that point on. In (essentially) the notation used at that link, your position would arise after

1.e4
1.b6; g6

Other than the fact that each side makes two moves, the rules are essentially the normal rules of chess. There are of course some necessary changes, e.g. if your first move is a check you don't get a second one. Follow the link for full details and some history.

1315: <p>As we know, castling is a legal "double move," where two pieces are moved at once. </p>

<p>But in my country, Indonesia, in my childhood, the opening below was an 'assumed legal' double move to counter <code>1.e4</code> and similar openings.</p>

<pre><code>[FEN "rnbqkbnr/p1pppp1p/1p1111p1/8/4P3/8/PPPP1PPP/RNBQKBNR - - - 0 0 "]
</code></pre>

<p>As I understand, this opening is an illegal double move. (Someone can help me with the FIDE rule.)</p>

<p>I would like to know, though, are such double moves played in any other place in the world??</p>
 291: <p>Castling is the only legal chess move in which two pieces are moved. You can verify this by searching for "FIDE Laws of Chess" and reading "Article 3: The moves of the pieces" (I do not provide the URL here because unfortunately it frequently changes).</p>
 167: <p>From your description, I'm not sure whether in your childhood games the sort of double move you showed above could only happen at that one point in the game, or could continue to happen. So I don't have much to say, but there is at least an established chess variant (dating back to the early 20th century) in which your indicated sequence of moves could occur legally.</p>
<p>The game is <a href="http://www.chessvariants.org/multimove.dir/marseill.html" rel="noreferrer">(Balanced) Marseillais Chess</a>, in which White begins with a single move, but then each side alternates making two successive moves from that point on. In (essentially) the notation used at that link, your position would arise after</p>
<blockquote>
<p>1.e4</p>
<p>1.b6; g6</p>
</blockquote>
<p>Other than the fact that each side makes two moves, the rules are essentially the normal rules of chess. There are of course some necessary changes, e.g. if your first move is a check you don't get a second one. Follow the link for full details and some history.</p>
