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Subject: Re: How to detect cheaters ?

Author: Cap Ricardo SantAna

Date: 07:36:37 01/05/06

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On January 04, 2006 at 15:38:44, Joseph Ciarrochi wrote:
Hello

ok. your ideai is very close to mine :) First I analyse games with a good chess
engine (said fritz or hiarcs or junior - I do not have schredder :( ) with
itś own full analysis tool. I choose a value of 10 (0.1 pawn value)
parameter. So, if engine finds a variation which is better than 0.1 pawn the
move played, then it adds a variation.

Ok. this is easy, because all "dirty" job is a computer one. Itś
interesting that this analyed game gives me a good clue if one is playing or not
with computer help (ok, I am considering that cheater which uses computer almost
all time).

 After this, I use chessbase and analyse the game with one more two engines
(fritz and hiarcs is my common choice). So, I begin selecting the moves played:
1 - for first engine choice, 2- for second engine choice, and 3 - for trhird
choice.

My problems begin now. What can be consider a cheater ? whow much moves ?
thanks in advance
Sant Ana


>I am speculating here but.....
>
>
>I think one way is to look at the moves the human makes and see how they are
>ranked by a good engine. e.g., how often does the person choose the number 1 or
>2 move suggested by the computer.
>
>I have heard that it is statistically unlikely for someone who is not a GM or
>master to consistently choose a number 1 or 2 move.
>
>You could presumably analyze a massive number of games you know to be human and
>find the average rank of the move by rating level (e.g., an 1800 player may may
>on average pick a move that is rated 4th by computers, or tends to make x
>percentage of rank 1, 2, 3 and 4 moves). Then you could analyze any new human
>game and determine if the human is making moves that are statistically much
>stronger than you would expect based on their rating. You could also catch
>humans who are using the comptuer sometimes but not others. Their distribution
>of ranked moves would be very different from other humans (e.g., they would make
>alot of rank one and rank 4 or greater moves, but too few rank two and three
>moves)
>
>This is just speculation mind you. I wonder how else it could be done?
>
>best
>Joseph



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