Video nr 1
The attacker who scores the goal is in an offside position when the ball is played by his team-mate. The referee should delay awarding the penalty kick and wait a second to see if a goal will be scored. When the assistant does not see that the defender deliberately handles the ball then he should raise the flag for offside.
If the assistant sees that the defender handles the ball deliberately then he should allow the goal. It is clearly stated that handling must be considered to be deliberate play and not deliberate save (except the goalkeeper in the penalty area with a shot on goal). The attacker scoring the goal is played onside by the defender and the goal is legal. A yellow card for the defender would be correct by the Law.
If the assistant does not realize this and raises the flag then the referee must lower the flag, allow the goal and calmly explain the reason.
Video nr 2
The attacker is in an offside position when the ball is played by a team-mate. The goalkeeper raises his knee to protect himself when reaching to catch the ball, but in a heat of the moment deliberately lowers his leg into the opponent using studs. The goalkeeper must be sent off for violent conduct.
A penalty kick should be awarded normally. But here the attacker is in an offside position and is clearly challenging the opponent for the ball (look at the pictures below). The offside infringement happens before violent conduct - therefore the referee should award an indirect free-kick and give a red card to the goalkeeper.
The assistant could have raised the flag for offside, but decided to wait and see. This can be accepted in some cases if the assistant feels that the goalkeeper would catch the ball, there is no speed involved and that advantage could be applied. In the given scenario the assistant should raise the flag for offside after seeing the violent conduct - this makes the final decision more understandable.
 The attacker runs a distance from here... |  ... to there - this is a challenge for the ball |
 Before the ball is played - a challenging distance |  Illegal use of studs |
Video nr 3
The attacker is in an offside position when being fouled by the defender. But as the attacker is not interfering with play and is not interfering with the opponent then awarding the penalty kick was the correct decision. This is also the official statement by UEFA.
The attacker is not challenging the defender for the ball and the ball is clearly not in playing distance.
Being in an offside position is not an infringement itself, but a clear holding by the defender is.
Video nr 4
The attacker is in an offside position, but is not interfering with play or with an opponent. Free kick must be given for deliberatley handling the ball.
If the attacker would not be in an offside position then the defender should be shown a red card for DOGSO. But as the attacker would be called offside here, then he does not have a scoring opportunity, so yellow card for promising attack is also out of the question.
The next possibility would be a yellow card for "deliberately handling the ball to prevent an opponent from gaining possession". But there is no attacking player who would have a legitimate possibility to gain possession of the ball.
There is also no possibility to use "image of the game" as an argument for a yellow as the handball is not "blatant" and the hand is in a natural position.
Offside Explained verdict would be free kick + no card. A yellow card could be somewhat understandable, but when following the meaning of the Law then it does not directly state that.
Video nr 5
The foul is made about 1 second before the ball is played. In theory an attacker may be penalised for offside before he plays the ball, but there are exceptions to it. When looking in detail then the foul is made clearly before the attacker must be called offside, so when the assistant raises his flag then the referee should cancel the advantage and penalize the defender for the foul.
There can be no promising attack (because offside would be the outcome here), but a yellow card should be shown for holding.
As an assistant referee you should raise the flag to indicate the offside infringement. When using head-sets then you should advise the referee to take the foul as there was no advantage - a perfect example is given in the next video.
Video nr 6
This is almost the same incident as in the last video, but this time it is excellently handled by the referee. The body language is clear and the referee explains to the players why the foul needed to be taken.
As an assistant you should raise the flag in such situations. When using head-sets you should also advise the referee to take the foul if you are aware of it.
As an assistant you should raise the flag in such situations. When using head-sets you should also advise the referee to take the foul if you are aware of it.
Video nr 7
The referee waits for advantage, but correctly orders a free kick as the attacker receiving the ball is in an offside position. Another great example of good team-work and understanding of the game!
Video nr 8
A penalty kick should be awarded as the foul is made clearly before the offside offence occurs. Teamwork, co-operation and calm assessing is needed by the refereeing team. The referee needs to understand Law 11 perfectly (like in the 2 previous videos) as it is hard for the assistant to judge if a foul was committed.
Video nr 9
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In this kind of incidents there is no offside offence. A yellow card could be given for the "image of the game" not for a promising attack. But a yellow card is not compulsory.
Video nr 10
If there is a foul then it is made slightly before the players are challenging for the ball. By the book, this would be a foul, because the offside offence has not occured yet.
In real time these two offences seem to happen basically at the same time. When the referees are not certain if the holding took place before the offside offence happened then offside should be called.
In real time these two offences seem to happen basically at the same time. When the referees are not certain if the holding took place before the offside offence happened then offside should be called.