
There are exactly 20 possible (half-)moves from the opening position, all listed below.
Frequently the opening name in a published game will be different from the name
below when later moves cause that opening to transpose into a better known opening,
or when the moves develop into a more specific name.
The two most common opening moves (1. e4, 1. d4) are rarely referred to by name unless
the opening so irregular that no other name applies,
because later moves usually lead to a more specific and more descriptive opening name.




















[1]
http://www.chessarch.com/library/0000_eco/a00.shtml (1-27-05)
[2]
Korn, Walter. 1982. Modern Chess Openings, Twelfth Edition (MCO 12).
New York: David McKay Company.
[3]
http://www.chessarch.com/library/0000_eco/a02_a03.shtml (1-28-04)
[4]
http://homepage.ntlworld.com/adam.bozon/unusual.htm (1-27-05)
[5]
http://www.chessarch.com/library/0000_eco/a04_a09.shtml (1-28-05)
[6]
http://www.chessarch.com/library/0000_eco/a10_a39.shtml (1-28-05)
[7]
Horowitz, I.A. 1964. Chess Openings: Theory and Practice.
New York, NY: Simon and Schuster.
[8]
http://www.chessarch.com/library/0000_eco/b00.shtml (1-28-05)
[9]
http://www.chessarch.com/library/0000_eco/a40.shtml (1-28-05)
Updated: January 29, 2005
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