Bird's Opening (or the Dutch Attack) is a chess opening characterised by the move:
1. f4
Named after 19th century English player Henry Bird, Bird's opening is a standard flank opening. White's strategic ideas involve control of the e5-square, offering good attacking chances at the expense of slightly weakening their own kingside. Black may challenge White's plan to control e5 immediately by playing From's Gambit (1...e5); however, the From Gambit is notoriously double-edged and should only be played after significant study.
Convert all the letters in the opening into numbers A=1, B=2... Y=25, Z=26 etc..
BIRDSOPENING = ABCDEFGHIJKL
The cache can be found at:-
N55 (I-K)(F-B). (B-J)(E-C)(H-A)
W001 (E-G)(H-D). (E-I-D)DA