龍式變著是西洋棋開局西西里防禦的一種，走法為：
1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6
參考文獻
- Miles, Tony; Moskow, Eric. Sicilian Dragon: Yugoslav Attack. Batsford. 1979. ISBN 0-7134-2029-4.
- John Emms; Richard Palliser. Dangerous Weapons:The Sicilian. Everyman Chess. 2006. ISBN 1 85744 423 x.
- Levy, David. The Sicilian Dragon. Batsford. 1976. ISBN 0-19-217571-8.
- Ward, Chris. Winning With the Dragon. Batsford. 1994. ISBN 0-7134-7210-3.
- Gufeld, Eduard. Secrets of the Sicilian Dragon. Cardoza. 1998. ISBN 0940685922.
- Golubev, Mikhail. Easy Guide to the Dragon. Everyman Chess. 1999. ISBN 978-1857442755.
- Ward, Chris. Winning With the Sicilian Dragon 2. Batsford. 2001. ISBN 0-7134-8236-2.
- Dearing, Edward. Play The Sicilian Dragon. Gambit. 2005. ISBN 1904600174.
- Martin, Andrew. Starting Out: The Sicilian Dragon. Everyman Chess. 2005. ISBN 1857443985.
- Williams, Simon. The New Sicilian Dragon. Everyman Chess. 2009. ISBN 9781857446159.
本條目使用代數記譜法來描述西洋棋棋子的走法。
