The game presented by a Java applet below was published in 2002 the American Mathematical Monthly as problem #569 (Sung Soo Kim). A solution by Li Zhou appeared in v. 111, n. 4 (April, 2004), pp. 363-364.

A game starts with one stick of length 1 and four sticks of length 4. The two players move alternately. A move consists of breaking a stick of length at least two into two sticks of shorter lengths or removing n sticks of length n for some n{1, 2, 3, 4}. The player who makes the last move wins. Which player can force a win, and how?

The applet allows one to start with different initial configurations, but also with the standard one. At the outset, you can force the computer to make the first move by pressing the "Make move" button. Sticks are represented by a row of small squares that might remind of a chocolate brick. To break a piece click on a square to the right of the desired break line.