Editing King's Gambit (section)

===== 4.h4: Kieseritzky Gambit and Allgaier Gambit <span id="Kieseritzky Gambit and Allgaier Gambit"></span> =====
With 4.h4 White practically forces 4...g4, thereby undermining any attempt by Black to set up a stable pawn chain with ...h6 and ...Bg7.

The [[Kieseritzky Gambit]], 4.h4 g4 5.Ne5, is considered by modern writers such as Shaw and Gallagher to be the main line after 3...g5. It was popularized by [[Lionel Kieseritzky]] in the 1840s and used successfully by [[Wilhelm Steinitz]]. [[Boris Spassky]] used it to beat [[Bobby Fischer]] in a famous game at [[Mar del Plata chess tournament|Mar del Plata]] in 1960.<ref>{{cite web |url=http://www.chessgames.com/perl/chessgame?gid=1080046 |title=Spassky vs. Fischer, Mar del Plata 1960 |website=[[Chessgames.com]] }}</ref> The main line of the Kieseritzky Gambit is considered to be 5...Nf6 (Berlin Defense) 6.Bc4 d5 7.exd5 Bd6 8.d4 Nh5 9.0-0 Qxh4 10.Qe1 Qxe1 11.Rxe1 0-0 12.Bb3 Bf5. The Long Whip Variation, 5...h5?! 6.Bc4 Rh7 (or 6...Nh6) is considered old-fashioned and risky, as Black loses a lot of time attempting to hold on to the pawn.

4.h4 g4 5.Ng5 is the [[Johann Baptist Allgaier|Allgaier]] Gambit,<ref>{{cite book
 |last1=Kasparov
 |first1=Gary
 |author-link1=Garry Kasparov
 |last2=Keene
 |first2=Raymond
 |author-link2=Raymond Keene
 |title=Batsford Chess Openings
 |publisher=American Chess Promotions
 |year=1982
 |pages=288–89
 |isbn=0-7134-2112-6}}</ref> intending 5...h6 6.Nxf7. This knight sacrifice is considered unsound.<ref>Shaw, pp. 200–202</ref>