It is frustrating to see that the solution published on the O'Reilly site has so many bugs and errors (for example, it starts with every guy having 100 bucks, but the book requires them to have 50, 75, 45).
Also, some solutions found on the internet use concepts not covered in the book until the Lab (so we shouldn't make use of inheritance, encapsulation, constructors, properties for example).
At some point, they should release a full-code version and help all of us. I did finish it using all the help presented here and in the book, but not being sure I applied the best techniques is still frustrating.
