Simple answer is, it doesn't. This why modern players prefer 3...Nf6
a query about kga
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if it does not go with opening principle, then it's a mystery to me that the encyclopedia of chess openings includes 'kga classical defense', 'kga Fraser variation', 'kga Boden's defense' and many more under c33 all of which playing 3...Qh4+
His question did not ask if it is playable which is why, has it is pointed out, that it is included in ECO.
Fiveofswords wrote:
the rule about not moving the queen early is actually nonsense. They tell beginners that only because bad queen moves will often kill you...so its dangerous if you dont know what yr doing. But in this example the queen move is quite logical and fine, and the queen is perfectly well placed long term on h5 (after ...nf6)
+1
I think this is a dynamic and beautiful opening for White. I also think Black shouldn't bring out the Queen to check White, but continue with their own development and strategizing - I think it wastes tempo for Black, as the White king faces no immediate danger and is in the position to bring a lot of force against the f7-square.
pfren wrote:
3...Qh4+ is just one good move out of several (3...Nf6, 3...Nc6, 3...Ne7, and my personal preference, 3...d5). Picking one of them is largely a matter of taste.
3...d5 is nice. Out of curiosity, IM pfren, what is your follow-up to White capturing on d5? c6 if bishop takes? Nf6 if pawn takes?
The line is included in ECO because it has been played with some frequency at master level.
The intention of ECO (and others -- BCO, MCO) is to show commonly-played lines, not merely the line considered 'best'.
pfren wrote:
3...Qh4+ is just one good move out of several (3...Nf6, 3...Nc6, 3...Ne7, and my personal preference, 3...d5). Picking one of them is largely a matter of taste.
It's a good move but it fell out of favor because white has compensation for the lost castling rights, namely the queen is misplaced somewhat (no longer supports a ...d5 thrust, though does hold the f4 pawn nicely from h6) and white obtains a good center and development.
I personally like 3...Nc6! against 3.Bc4 because GM Shaw concluded it was best during his many years of research into the King's Gambit. He even goes so far as to say 3...Nc6 is a refutation of the bishop's gambit!
waooo. so many thoughtful comments!!! it's been a very much effective learning for me. thanks all.
in kga bishop's gambit we often see black playing 3...Qh4+. now my question is: how does this idea conform with opening principle which discourages an early exposure of the queen?