[robocup-small] the rule of "Two defender in defence area"

[Andrea Palmer]

Hi all,

I agree with Yonghai's statement that this rule caused difficultly in
Mexico. However, I think so far the suggestions might make it *more* difficult
for the referee to monitor.

 If a second defender would be allowed in the area and if it would only be
penalized if touched by the ball, then the referee must watch both the ball
(moving at 8 m/s) and the defending robot's proximity to the defense area,
as well as everything else he or she must be watching on the field.

Although reducing referee subjectivity will help with more concrete rules
of the game and procedures over disputes, making the rules *too* specific
by adding the percentage of the robot that is allowed in the box adds more
complications during the game. How easy will it be for a referee tell the
difference between 50% and 30% of the robot over the line?  I think the
referees need a better explanation of this rule and when to enforce it.
Does it count if an attacking robot pushes the defending robot in the area?
Does it count if the robot is passing through the box, but is not staying
in the box (yes, if the ball touches that robot)?

I can anticipate more arguments during competition around this issue if,
for example, the second defender and the goalie are close to each other,
inside the defense area, and the ball touches one of them. How is a referee
supposed to tell which robot the ball touches?

Finally, if a second defender would be allowed in the area, what would
happen if a third crossed the defense line too? Then, not only would the
referee have to closely watch the third robot to see if it is, in fact, in
the defense area, but also it might require the initial rule that caused
this discussion in the first place.

Please also keep in mind that there are currently only two referees per
game that walk along the sides of the field. During a game, there are
usually many team members with many sets of eyes along the ends of the
field who might have a better view of the defense area, and it is easier
for them to catch what the referees missed.

Thanks,

Andrea Palmer
UBC Thunderbots

On Wed, Nov 21, 2012 at 10:32 AM, Carlos Saith Rodriguez <
saith_rodriguez at hotmail.com> wrote:

>  Hello friends
>
> I agree with Yonghai, this rule has created many inconveniences and
> clashes between the teams and that's not good for our community.
>
> The proposal is good, but it needs to be very specific. for example, in
> any situation in which the defender touches the ball inside the defense
> area was penalized.
>
> More over it is necessary to define exactly when a robot is in the defense
> area: when the robot touches the line delimiting the area or when 50% of
> the robot is inside the area.
>
> We must find a solution to decrease the subjective interpretation of the
> referee.
>
> Regards
>
> Saith Rodriguez
> STOx's Team Leader
>
>
>
> > Date: Wed, 21 Nov 2012 22:44:15 +0800
> > From: liunian at zju.edu.cn
> > To: robocup-small at cc.gatech.edu
> > Subject: [robocup-small] the rule of "Two defender in defence area"
>
> >
> > Hi everybody,
> >
> > Maybe everybody in Mexico has a very deep impression on the law
> > of "Two defender in defence area". There were 3 penalties in the
> > Quarterfinals Skuba vs Immortals due to this law.
> > Law 12 of rule 2012 give the detial definition: is the second
> > defending robot to simultaneously occupy the team's defence area in
> > such a way tosubstantially affect game play. But the rule did not
> > give a clear definition of "substantially affect game play", is all up
> > to the referee. So the problem is comming, i remembered that maybe
> > more than 50% argument during the game are related to this law.
> > In real soccer game, there has not limitaion of the number of
> > defenders in defence area, but only allow the Goal keeper can handle
> > the ball, if the other player touch the ball with hand, he will
> > receive a read card and the team will receive a penalty.
> > We can learn from this real soccer rule. All the robot can enter
> > it's own defence area, but only the goal keeper can touch the ball, if
> > the other robot touch the ball, the team will receive a read card and
> > a penalty.
> >
> > Best regards.
> >
> > Yonghai Wu
> > _______________________________________________
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> > robocup-small at cc.gatech.edu
> > https://mailman.cc.gatech.edu/mailman/listinfo/robocup-small
>
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