Difference between double attack and fork???

Fork is only with pieces

Ok now I understand. Thanks.

Not sure if this is what you're after, but here's a triple attack:

Here is an explanation for a double attack. 

So, as someone said, fork is when 1 piece is attacking 2 pieces. Double attack is when 1 piece creates 2 threats. It can attack a piece and threaten checkmate at the same time.

A double attack is when you threaten two things at once whereas, a fork is when a piece attacks 2 or more pieces at the same time.

Not sure that there's an official or widely accepted definition.

I've always used "fork" if the two attacked pieces are both being attacked by the same piece in the same manner (eg: Pawn or Knight will always fork instead of double-attacking, since they have only one attack mode each); while a double attack involves two pieces being attacked in different ways (such as a Queen attacking one piece along a diagonal and a second piece along a file).

The simplest way I can explain it is a
fork is 1 piece that attacks 2 or more opponent pieces guaranteeing that you win material
double attack is when a move creates a threat on 2 or more squares at a time (example - discovered attacks like pushing a pawn which attacks a piece and also reveals a bishops sight to a 2nd piece)

A fork is where one piece attacks two pieces at once. For example -

The knight forks the king and the queen.

Meanwhile a double attack is where a move creates a double attack, which can be attacking two pieces at once and threatening checkmate and also attacking   another piece or giving a check and also attacking an undefended piece. For example -

Hope this helped. And by the way please send me a friend request

Agreed with above post. Fork is one piece attacking two. Double attack is two pieces attacking one.

I also think double attack is 2 pieces attacking 2 different pieces

Or 1

But mainly 2

2 pieces attacking 1 should only get a term when it's a double check

Who wants to come up with a name for 2 pieces attacking 1? Seems like a fun project :)

A fork is one type of double attack.  The fork is a subset.  All forks are double attacks, but not all double attacks are forks.

A fork is specifically one piece or pawn (can be any piece, including the King, like WBd4, WNe4, BKd6 (he is in check), the move ...Kd5 forks the 2 white pieces).

A double attack is two things attacked at the same time by a single move, not a single piece.  The most common aside from the dirk is the discovered attack or discovered check.  An example would be WKf1, WRe1, WNe3, BKe8, BQa5.  The move 1.Nc4+ is a double attack.  The Knight attacks the Queen and the Rook, through the use of a discovery, attacks the King.  Now this one would only be a draw due to Qxe1, but let's say the Queen was on b2, now it would be a win!

No, not necessarily 2 attacking 1.  Could be 2 attacking 2 different pieces (usually one from discovery).  Se the previous post of mine.

I can beat that with a Quintuple Attack!

1.Nf7+ with a quintuple attack!

Wow!... I just learned absolutely nothing, but definitely laughed so hard I felt like I was watching a stand up comedy, haha. 

so maybeeee a fork is when one piece attacks two or more pieces and that’s it... and that cna also be a double attack? But more proper if it’s called that if it’s a pawn or knight. (Or bishop, why not) and a double attack is when it’s just more complex, let’s go with that. Discovered attacks/checks/ threats even, but not a simple bam your pieces are u protects amd forked forker, type of thing! 

Or not.... or..... not...... lol 

chess is fun, and surprisingly fun-ny 

you ALL rock!   

~Keefe

And is one piece attacked ‘twice’ (aka double), a doubly attacked piece, but not a double attack? 

if your GF comes to your house and doesn’t know you’re married, andddd your wife is home (bad structure, and not ok), are you forked, and double attacked?