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When, geometrically, do you know you have BI?
Standard sizes (high school) all the way around.
Saw this tonight. A1 drives in, puts ball off of the backboard, defender pins ball to backboard, just inside the smaller painted rectangle above the rim. No call from the officials, but I'm thinking that their has to be a line within that rectangle where if the ball is touching the backboard inside of that boundary that part of the ball has to be over the cylinder. Is there a rule of thumb for this? Here is a crappy image showing the rectangle, er, "shooter's square".
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-- #thereferee99 Last edited by referee99; Wed Feb 04, 2009 at 12:34am. |
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Not in high school.
It was unclear if the ball was on its downward flight. I don't think it was, but lets say it wasn't.
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-- #thereferee99 |
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You have to have 3 things to have Goaltending.
If any of these things are not present, then you do not have a violation. It is possible that one of these things was not present and the officials passed on the play. The backboard or the ball touching the backboard has nothing to do with this call the high school level. Only at the college level is the backboard a factor. Peace
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Let us get into "Good Trouble." ----------------------------------------------------------- Charles Michael “Mick” Chambers (1947-2010) |
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I'm talking about Basket Interference.
Part of the basketball may have been in the imaginary cylinder with the basket as its base. Wanting to know where that area is on the back board. Recently Andris Biedrinch of the Warriors was called for a violation when he knocked the ball off the flange during live action. In NBA it was goaltending (i think) but would have been basket interference in HS. If the ball is contacting the backboard directly behind the basket part of the basketball MUST be in the cylinder, given the size of the ball. At some point further away from the center of the backboard this must also be true. How far out can you go and have an automatic, provable by geometry basket interference?
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-- #thereferee99 Last edited by referee99; Wed Feb 04, 2009 at 12:48am. |
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Rim diameter is 18", Ball diameter is 9". The square in question is 18" tall and 24" wide. So once about 1/4 of the ball is within the square then it has penetrated the imaginary cylinder above the basket. So yes by geometry BI could be called it the ball is contacted after the referee observes that a 1/4 or more of the ball is inside the square.
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Peace
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Let us get into "Good Trouble." ----------------------------------------------------------- Charles Michael “Mick” Chambers (1947-2010) |
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Sweet.
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-- #thereferee99 |
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hrm.
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-- #thereferee99 |
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As I said, I think you are taking a judgment call and trying to make a one size fits all application. If the ball is not in the cylinder, it is not BI. If you think it is in the cylinder (and certain things are present), then call a violation. You will find that at full speed you are not going to get a simple judgment based on a marking. If the ball hits the backboard does not mean it was touched at the very same spot. Peace
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Let us get into "Good Trouble." ----------------------------------------------------------- Charles Michael “Mick” Chambers (1947-2010) |
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I think that while it is possible theoretically to use the backboard markings to determine a violation, in reality one would need at least a slow motion replay for this to be useful. See it. Call it. Live with it. This is a call that is very often difficult to make with complete certainty.
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I swear, Gus, you'd argue with a possum. It'd be easier than arguing with you, Woodrow. Lonesome Dove |
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i see where you are coming from.
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I used to have a backboard and rim sitting in my garage. If i still had it I'd go roll a ball around on it and get some empirical knowledge. I am NOT willing to get a ladder out though.
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-- #thereferee99 |
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That would be goaltending, not BI. As JRut has said, the backboard has nothing to do with BI.
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A-hole formerly known as BNR |
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"You Are Correct, Sir" (Ed McMahon)
This statement is 100% correct, but I believe that referee99 is trying to point out to us that the backboard limits the position of the ball, inside and outside, of the imaginary cylinder, when the ball is behind the basket. If the ball is on either side of the basket, to the left, or to the right, then it is possible for the ball to either be either inside the cylinder, or outside the cylinder. If the ball is in front of the basket, the it is possible for the ball, again, to either be inside the cylinder, or outside the cylinder. What, I think, referee99 is saying is that the backboard may be a limiting factor behind the basket, that is, if the ball is in contact with the backboard, and it's not too far to the left, or too far the right, of the basket, then that ball must, according to referee99, be inside the cylinder. The ball can't go farther back than the backboard, it's against the laws of physics. I'll let someone else work out the math, using the diameter of the ball, and the depth of the flange attached to the backboard. It's 19 degrees outside right now, and I refuse to go out onto my icy driveway, get up on a ladder, and check out referee99's theory on my basket and backboard.
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"For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life." (John 3:16) “I was in prison and you came to visit me.” (Matthew 25:36) |
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Had a rec game last night...
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When a mens basketball is placed so that the vertical center of the ball is aligned with the middle of the outer edge of the 'shooters rectangle' and the ball is touching the backboard, the ball is not touching the cylinder with the ring of the basket as its imaginary base. It is juuust outside of the cylinder. Move it in 1" and it is touching that imaginary cylinder.
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-- #thereferee99 |
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