The rules are simple. The players (you and the computer) take turns. On each turn, a player may take one, two, or three rocks. You take rocks by clicking on the button with the appropriate number. The player who takes the last rock wins.
You get to select the number of rocks we start with by setting
the value at the top of the screen. Then click on the
Restart button to start a new game. The computer
always goes first.
A log of moves is kept in the scrolling window. The
Clear button can be used to clear all of the text
from this window. Moves are also recorded by changing the color
of the rocks. Rocks taken by the human change from black to
white with a blue outline. Rocks taken by the computer change
from black to white with a red outline.
See if you can figure out how to beat the computer. Can you beat it starting with any number of rocks?