• Posts
  • RSS
  • ◂◂RSS
  • Contact

  • Simplest Interesting Game

    August 12th, 2013
    games  [html]
    Yesterday in the discussion on aliens don't play chess people suggested various contenders for the title of simplest abstract game that's interesting enough that a professional community could reasonably play it full time. I went thinking Go was the clear winner, but people suggested Checkers and Dots and Boxes might be simpler while remaining sufficiently interesting. [1] Is Checkers actually simpler than Go? If so, how much? How would we decide this?

    Initially you might approach this by writing out rules. There's an elegant set for Go and I wrote some for Checkers, but English is a very flexible language. Perhaps my rules are underspecified? Perhaps they're overly verbose? It's hard to say.

    A more objective test is to write a computer program that implements the rules. It needs to determine whether moves are valid, and identify a winner. The shorter the computer program, the simpler the rules of the game. This only gives you an upper bound on the complexity, because someone could come along and write a shorter one, but in general we expect that shorter programs imply shorter possible programs.

    To investigate this, I wrote ones for each of the three games. I wrote them quickly, and they're kind of terse, but they represent the rules as efficiently as I could figure out. The one for Go is based off Tromp's definition of the rules while the other two implement the rules as they are in my head. This probably gives an advantage to Go because those rules had a lot of care go into them, but I'm not sure how much of one.

    The programs as written have some excess information, such as comments, vaguely friendly error messages, whitespace, and meaningful variable names. I took a jscompiler-like pass over them to remove as much of this as possible, and making them nearly unreadable in the process. Then I ran them through a lossless compressor, gzip, and computed their sizes:

    • Checkers: 646 bytes
    • Dots and Boxes: 499 bytes
    • Go: 593 bytes

    Update 2013-08-13: Added Hex. It comes in at 377 bytes gzipped, without the "swap rule". It's also been independently invented, which is some evidence for the claim that simpler games are more likely to be played elsewhere.

    (The programs are on github. If you have suggestions for simplifying them further, send me a pull request.)


    [1] Go is the most interesting of the three, and has stood up to centuries of analysis and play, but Dots and Boxes is surprisingly complex (pdf) and there used to be professional Checkers players. (I'm having a remarkably hard time determining if there are still Checkers professionals.)

    Comment via: google plus, facebook, lesswrong

    Recent posts on blogs I like:

    Austerity is Inefficient

    Working on an emergency timetable for regional rail has made it clear how an environment of austerity requires tradeoffs that reduce efficiency. I already talked about how the Swiss electronics before concrete slogan is not about not spending money but ab…

    via Pedestrian Observations February 27, 2021

    Fireside Friday, February 26, 2021

    Fireside this week, but next week we are diving into our long awaited series on pre-modern textile production, though we will be particularly focused on the most important clothing fibers in the Mediterranean world, wool and linen (rather than, say, silk …

    via A Collection of Unmitigated Pedantry February 26, 2021

    The Troubling Ethics of Writing (A Speech from Ancient Sumer)

    (Translated from a transcript of an ancient Sumerian speech by Uruk's most well-respected Scriptological Ethicist) Writing is a profoundly dangerous technology: Access to writing was initially, and still remains, uneven. What's worse, the rich are m…

    via BLOG - Cullen O'Keefe February 15, 2021

    more     (via openring)


  • Posts
  • RSS
  • ◂◂RSS
  • Contact