Actually, I didn't quite get the point of that puzzle being posted either. It was interesting...but, it seemed, hardly unique.
Pattern Recognition vs. Calculation

"Can't a mid level player get an answer that is quite good?"
You mean the line you gave that was just equal? Besides being equal (not good), that's pretty bad considering there's a forced win. The point of the puzzle is to exploit / learn a pattern. You just forced a few trades :p

Well, orange, you don't have to stick your tongue out at people. But, if you do...then do it right:
Anyway, no...I was speaking in general. I didn't claim that I got the puzzle right...not in the sense of the forced win. I play OK...but I don't claim to be world class.
At chesstempo...on some puzzles, if you get a quite decent answer but not the very best, they don't sound a buzzer and stick you in a dunking chair. They say: "Good...but keep looking".
I am not a bullet player. Rapid is as fast as I want to go. I don't want to play "flash card chess" (I just coined that term)...I want to spend a little bit of time...maybe even a whopping 30 seconds...on thinking and calculating.

I haven't played bullet chess in awhile (wont show my old games, so I don't know how long it's been), and it's usually junk moves I agree. Much more satisfying are long games, but I don't have the patience online. I like to play with 10 or 15 minutes with at least 5 second add on for casual games.
And two hours a day is great, I wish I could discipline myself to do that, but I'm lazy right now :)

10 or 15 is exactly what I prefer...not too hot and not too cold. Those elongated correspondence games are, to me, what is the word...anathematic?...just as are the 5 min. and under.
Yeah, you read that before I edited it out. Yes, two hours per day...playing and studying. But then, I am retired, For forty years, I had been away from chess...the usual stuff, university, family, business.
Now I can do whatever I want when I get up in the morning. Chess is part of that.

The point of the puzzle is to exploit / learn a pattern.
I have no idea what you mean. That was quite a remarkable, once-in-a-lifetime solution (so I don't know what e4nf3 means either). It has nothing to do with patterns, near as I can tell (unless maybe you're a 4000 player).

I saw it as a calculation. And, I agree, unless you are a 4,000 player...the pattern recognition seems problematic.
I did a "seat of the pants" calculation. It was not the precise answer...which is understandable since I am not a world class player...but what I decided was playable.
I'll tell you all something. On tactics trainer here, I am having a tough time at the moment. I had been getting up to about 1775...real close to my goal of 1800. Then, something happened...
You can't reset the tally anymore. And, they changed the puzzles. I think that I was getting accustomed to pattern recognition on the given puzzles and was also seeing repeats.
The new puzzles seem tougher...five move, intricate combos on 1200 rated puzzles, for example. And, they are teasers. Many/most of the puzzles where you'd recognize a pattern...well, there is a pernicious twist (don't get me wrong...I like a challenge). You knee jerk your moves from pattern recognition and you get the buzzer and strapped into the dunking chair. Close doesn't even win you a cigar.
Too, the time controls are for blitzers. Take an extra 10 or 20 seconds and you will also get strapped into the dunking chair.
Am I complaining? Yeah...somewhat. But I'm gonna get back up to 1800...no question about it. I am more of a calculator than a pattern recognizer...and I play rapid, but not blitz/bullet.
So...I've gotta get better and faster. And, I will.
Are these tactic trainer problems realistic? Sure...at higher level tournament play. In real life...I don't know about you guys, but I tend to need a little more than 30 frickin' seconds to do a five move combo and where I am in the dunking chair for only winning a Q but having done so at the expense of not having gotten a mate.
Jerks. These guys are jerks...those who put together these tactics. Oh, sure...they will say it is this "pool" thing. That's all subterfuge for their being jerks.
I will have the last laugh, though. What doesn't kill me makes me stronger.

When did you notice the new puzzles show up? I've been delinquent in my TT the last week or so. The peasants revolted a few months ago when they downloaded 100,000 new tactics all at once - they were mostly broken and/or completely uncalibrated so it wreaked havoc. They didn't do that again, did they? In any case, good on you for the last laugh attitude :-)
Not really sure what the point of that posted position was...except perhaps to indicate that these sorts of distinctions are rather specious (as is usually the case).