Are there any openings in which white or black deliberately chooses to forfeit castling rights and move the king? Not because of a checking move by the opponent, but because it's actually a good idea for the particular opening. Just wondering.

Thanks.

 there are a couple of lines in the Benko gambit accepted where white ends up castling by hand due to exchanging bishops on f1 and recapturing with the king (gets a better pawn structure and removes blacks control of that diagonal, but loses a couple of tempo).

other than that, i can't think of any openings where either side would forfeit castling?

Sometimes in closed openings the center can be the safest place for the king, because simply pieces cannot get through the center.  One such notable opening is the french.

Fried liver moves the black king. But that's generally bad.

You'll see some of that in the Traxler Counterattack in the Two Knights Defense, but the theory there is a madman's game.

Thanks for your answers. I'm interested in playing around with some very risky but solid openings. Nothing is more risky than giving up castling rights when you don't have to or moving your queen out early when you don't have to. I will look at the Benko gambit and other gambits as well. Steev, madman and mayhem are what I'm interested in right now. Seems like fun. 

The fried fox pork chop opening.

Risky and solid are two words that usually doesn't go to well together, you wan't something solid and risky? I thought the whole definition of something solid was that it's not risky, and vice versa?

1. Nc3 depending on what your opponent plays against it.  It can lead to a type of scandinavian where white just moves his king over to the queenside instead of castling. 

some lines of king's gambit, where black plays Qh4 +, and white moves king.

I have studied that that it ends up very bad for black. It's played 1.e4, e5, f4, exf4 and then Bc4 isn't it.

 Yes rich that is correct. Normally, white plays 3. Nf3 which prevents the queen checking on h4. However, Fischer (i think) preferred to play Bc4 first (before Nf3). You are correct, black can end up in a real mess - possibly losing the queen as it gets trapped by white's pawns and minor pieces.

I see, me and some people put it into fritz, and also found out that black can be checkmated as well. I have noticed that good players normally play Nc6 after the Bc4.

I love 'romantic' gambiteer era of chess. Big fan of King's gambit.

The kings gambit isn't anywhere near as common as it used to be I don't think. It was in the very old days of chess. I don't like the Queens gambit at all though.

a few players have revitalised the king's gambit recently - Spassky in the 1970's and Joe Gallagher and I think Nigel Short aswell more recently.

either way, it is my standard reply as white to e4 e5.

I know Spassky used the kings gambit, not sure about the others. My normal style of play though is the trompowsky attack as white, 1.d4 and if my opponent goes Nf6 which loads do then I play Bg5.

I will reveal no more regarding my opening repetoire in an open forum!!!!!!!!!

It's common in the French defense, either in the McCutheon or in the Winawer variation where white plays Qg4 and Black replies with Kf8 to avoid weakening the g-pawn if Black opts not to sacrifice it.

The variation 1.e4 e5 2.f4 exf4 3. Nf3 is not as popular as 3. Bc4. In Christoph Scheerer's book, The Greatest Ever Chess Opening Ideas, 2008, he goes so far as to say, "White's best try for a win is with 3. Bc4.