References.

1

D. Minematsu, M. Naito, R. Miyadera and etc., Combinatorial games, Kokyuroku, The Research Institute of Mathematical Science to appear.

2

Charles Bouton, Nim, a game with a complete mathematical theory. Ann of math.,Princeton,3. 1901-2.

3

A.C.Robin, A poisoned chocolate problem, Problem corner, The Mathematical Gazette Volume 73 1989.

4

Michael H. Albert, Richard J. Nowakowski and David Wolfe, Lessons In Play , A K Peters.

5

Bitter Chocolate Problem, " Material added 8 Jan 06 (Happy New Year)", MathPuzzle.com.