This LaTeX package provides macros based on TikZ to draw a game
tree. The main idea underlying its core macros is the
completion of a whole tree by using a sequence of simple
'parent-child' tree structures, with no longer nested relations
involved (like the use of 'grandchildren' or
'great-grandchildren'). Using this package you can draw a game
tree as easily as drawing a game tree with pen and paper. This
package depends on expl3, TikZ, and xparse. The 'ist' prefix
stands for "it's a simple tree" or "In-Sung's simple tree."
