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        Arimaa >> General Discussion >> Movement of rating points
        
(Message started by: Fritzlein on Aug 5^th, 2005, 12:59am)

Title: Movement of rating points
Post by Fritzlein on Aug 5^th, 2005, 12:59am

99of9 has pointed out that, since the large majority of games are human vs. bot and only a few are human vs. human, the transfer of rating points from one human to another occurs mostly via the bots. It is as if the bots are a big bank of rating points, and some people are depositing points while other people are withdrawing.

To put some numbers to this thoery, I chose ten recently active players, and for each measured their rating change over their last 100 rated games. I divided their games based on opponent type, and compared the net change of rating in games against bots to the net change of rating in games against humans. Only one of the ten players (robinson) had a greater magnitude of rating change from playing humans, so the bank account theory holds at least that far. We mostly trade points via bots rather than directly trading with each other.

Here are the changes sorted by difference in performance versus bots as opposed to versus humans:

Player	Rat Chng	vs. Bots	vs Humans
omar	-287	-226	-61
naveed	-19	-62	+43
Belbo	-41	-68	+27
robinson	+90	+32	+58
99of9	-98	-56	-42
blue22	+63	+34	+29
Fritzlein	+57	+56	+1
PMertens	+54	+77	-23
haizhi	+78	+95	-17
Ariminator	+400	+413	-13

This table seems fairly intuitive to me: the five of us in the bottom half did a lot more bot-bashing for rating points than the five in the upper half.

By the way, the my data is a couple of weeks behind, so it may not include some salient recent results, if folks are wondering why it doesn't exactly match their memory of the most recent rated games.