[robocup-humanoid] Discussion at the Robot Soccer WS at the Humanoids 2007

[Sven Behnke]

Dear Jacky,

one way to give the goalie some reaction time would also to count goals 
only when the ball has been kicked from the rectangular area between   
the center line   and    the line going through the yellow-goal-half 
restart markers.
This would mean that there is a minimal kicking distance that 
corresponds to the kicking distance used for the penalty kicks so far.
In this case, one could require the goalie to stay upright inside the 
goal area until the ball has been kicked.

This modification would also reflect the name "Dribble Kick Competition" 
better, because it would not be possible to dribble the ball into the 
goal without kicking it.

Best,

Sven.

Jacky Baltes wrote:
> On Dec 5, 2007 8:58 AM, Sven Behnke <behnke at informatik.uni-freiburg.de 
> <mailto:behnke at informatik.uni-freiburg.de>> wrote:
>
>     Dear Jacky,
>
>     Jacky Baltes wrote:
>     > I think the striker should have as high a chance of scoring as
>     if this
>     > situation occured in real soccer.
>     Fully agreed.
>     > Goalies would need to react very well to make a save.
>     Sure.
>     >
>     > The problem with the 15sec. rule is that teams will implement goal
>     > keepers that continuously block, wait 15 sec, go up, and repeat.
>     This has not been a problem in the 2 vs. 2 soccer games.
>     In fact, many goals were scored while a goalie was getting up and
>     repositioning.
>     During this time, the goalie cannot defend the goal.
>     Hence, it is a difficult decision for the goalie when to jump.
>
>     Furthermore, even if the goalie is on the ground, it will cover only
>     parts of the goal and the striker can easily kick into the free
>     goal areas.
>
>
> Incorrect. The goalie is allowed to move off the goal line and can 
> therefore cover the complete angle to the goal, assuming tha the ball 
> is close enough to the goal box.
>  
>
>     > I think it is easy to judge if a kick is on goal or not, but if
>     a more
>     > precise definition is wanted I would suggest that a goalie has to
>     > remain upright until the striker kicks the ball in such a way
>     that it
>     > enters the goal box. The goalie is then allowed to fall to block
>     the
>     > ball, note that this does not mean that the goalie has to wait until
>     > the ball has entered the goal box.
>     This suggestion is not practical, because the striker is allowed to
>     dribble right to the goal area, which would give the goalie zero
>     reaction time.
>
> This is not a good strategy since the goal iecan move forward but stay 
> inside the goalbox and cover the whole angle easily if the striker 
> dribbles too close to the goal.
>
>
>     As far as I know, there have been no problems with goal keeper
>     behavior
>     during 2 vs. 2 soccer games.
>     We should make the goalie rules for dribble and kick close to the
>     rules
>     that govern goalkeeping in 2 vs. 2 soccer.
>