## LESSWRONGLW

OK. Let me explain what the basic idea of my program was. The idea was to analyze the opponent's program in an attempt to answer the following question: What is the probability that I can affect the outcome of their program? Now that I've thought about this some more, this makes less sense than I initially thought; if there's a second round (and I have time to program something as complicated as this), I'm going to try the rather more sensible "How much I can I affect the probability distribution of their program's output?" But for now let's ... (read more)

I still don't see where set! is relevantly different from define... e.g.

``````(define result (if (random 100) 'C ((eval opponent) self)))
``````

# 32

The prisoner's dilemma tournament is over. There were a total of 21 entries. The winner is Margaret Sy, with a total of 39 points. 2nd and 3rd place go to rpglover64 and THE BLACK KNIGHT, with scores of 38 and 36 points respectively. There were some fairly intricate strategies in the tournament, but all three of these top scorers submitted programs that completely ignored the source code of the other player and acted randomly, with the winner having a bias towards defecting.

I represented each submission with a single letter while running the tournament. Here is a directory of the entries, along with their scores: (some people gave me a term to refer to the player by, while others gave me a term to refer to the program. I went with whatever they gave me, and if they gave me both, I put the player first and then the program)

A: rpglover64 (38)
c: THE BLACK KNIGHT (36)
D: skepsci (24)
E: Devin Bayer (30)
F: Billy, Mimic-- (27)
G: itaibn (34)
H: CooperateBot (24)
I: Sean Nolan (28)
J: oaz (26)
K: selbram (34)
L: Alexei (25)
M: LEmma (25)
N: BloodyShrimp (34)
O: caa (32)
P: nshepperd (25)
Q: Margaret Sy (39)
R: So8res, NateBot (33)
S: Quinn (33)
T: HonoreDB (23)
U: SlappedTogetherAtTheLastMinuteBot (20)