Berlekamp, Elwyn The 4G4G4G4G4 problems and solutions. (English) Zbl 1062.91522 Nowakowski, Richard J. (ed.), More games of no chance. Cambridge: Cambridge University Press (ISBN 0-521-80832-4/hbk). Math. Sci. Res. Inst. Publ. 42, 231-241 (2002). For the entire collection see [Zbl 1007.00019]. Cited in 2 Documents MSC: 91A46 Combinatorial games 91A05 2-person games PDFBibTeX XMLCite \textit{E. Berlekamp}, Math. Sci. Res. Inst. Publ. 42, 231--241 (2002; Zbl 1062.91522) Full Text: Link