There are, of course, well known mods that put Baldur's Gate 1 into the Baldur's Gate 2 engine. I am wondering, however, whether there have been any attempts to do the reverse.

I am also wondering how much of BG2 would have to be changed to work in BG1's more limited (I assume) engine.

There would be no point. You couldn't retain the same game in the BG1 engine, because of limitations.

I just bang my head against the keyboard to win and don't mess with mods and engines and glitches, but out of curiosity what does bg1 engine do that bg2 engine can't?

There are many mods that if work for bg2 also work for bg1.
i have not looked into it my self,but yes there is possibility to adapt bg2 mods to bg1.

You can however try playing BGtutu ,because that is bg1 in bg2 engine,then u could use bg2 mods most likely made for bgtutu as well

That wasn't the question.

Ah a stalker. ^.^
You are not helping with your statement.
Person wants mods made explicit for bg2 to work on bg1.

And i gave answer.
AS per moving entire game from bg2 to bg1 it can be done as well.
there is very little difference between games.few kits,rest is almost the same.Its bit tedious work tho and i dont see the point.

Question is why would anyone wanna port bg2 into bg1 engine?
Maybe if OP would clarify his intentions bit more?

Me, a stalker? Coming from somebody with hardly any forum presence, that's rich. You know nothing if that's what you think.

The OP does not want mods for BG2 made to work with BG1. Read the question again. Not without losing the integrity of the BG2 game. It cannot be done.

@Hickory
What my forum presence has to do with definition of "Stalker"?

Did u made your 3000+ "presence" by posting not helping posts after "stalking" people?
Oh pardon me.make that 3142?after posting second time on my posts with aggravating sentences.Oh yeah i count.

OP got his answer for his direct question.Post above mine.Yes?
As for me i tried to broad the pallet of his question by giving him bit more information.

Integrity..
if there was an actual valid reason to undergo such project it could and would be done.
Question still remains.Why is OP interested in such thing?
Is he attempting to bring some feauture from Bg2 into bg1?or some completely other reason.
Thats where my answer comes into play.

Stop waffling.

Be nice kids! :-P

No attempt has been made that I've heard of. And the reason is just like Hickory said -- there would be no point. Except to feel a great accomplishment for doing it. :)

PS That said, I wish someone would do a NWN2 into NWN1. haha.

I don't think "great accomplishment" would really fit, considering the end result would be a much inferior BG2...;)

The original question I found to be akin to questions like this:

"When I bang my head against a telephone pole, why does it hurt?"...;)

What limitations, and how would they affect the game?

In particular, how much of the game could be retained, and how much would have to be changed for it to work in the BG1 engine?

(For example, could Spellhold work? Could the Limited Wish quest work?)

How would CHARNAME change into the slayer? How would the group fight dragons? What about all of the different creatures and effects in Watcher's Keep? How would kits work? I haven't made a bulleted list, but think about it. If it was feasible, somebody would have done it, or attempted it by now: "whatever can happen, will happen".

Polymorph Self, I believe, does exist in BG1. Therefore, one could just create a shapeshift effect that turns the target into the Slayer.

What I mean is there are no pit fiends, ie. Baatezu (the Slayer is a modified pit fiend), only Tanar'ri (Aec'Letec), in BG1 for the player to morph into. But that's only one single point. There are literally dozens of reasons why it won't work.