Although we habitually call it snookered only when it is fully blocked, the official definition is quite different: it is snookered when each Ball on is blocked, even partially, by a Ball not on. The free ball and other rules are based on this definition.
Case A. Snookered
The green blocks the right-hand side of the furthest red (the other red doesn't count), and the yellow blocks the right-hand side of the closest red.
Case B. Not snookered
It is helpful to analyze each red as if the other reds don't exist (see image). The furthest red is not blocked by any colour, not even partially. Thus, the cue-ball is not snookered.
Case C. Not a free ball
You can hit both sides if you place the cue-ball very close to the red, which means it is not snookered. Remember, after a foul, it is a free ball if, and only if, the cue-ball is snookered.
The correct option is thus the fifth.
Responded correctly: 6%
Official definition
Section 2.17 Snookered
The cue-ball is snookered when a direct stroke in a straight line to every ball on is wholly or partially obstructed by a ball or balls not on. If one or more balls on can be hit at both extreme edges free of obstruction by any ball not on, the cue-ball is not snookered.
(a) If in-hand, the cue-ball is snookered if it is obstructed as described above from all possible positions on or within the lines of the āDā.
(b) If the cue-ball is so obstructed from hitting a ball on by more than one ball not on:
(i) the ball nearest to the cue-ball is considered to be the effective snookering ball; and
(ii) should more than one obstructing ball be equidistant from the cue-ball, all such balls will be considered to be effective snookering balls.
(c) When Red is the ball on, if the cue-ball is obstructed from hitting different Reds by different balls not on, there is no effective snookering ball.
(d) The striker is said to be snookered when the cue-ball is snookered as above.
(e) The cue-ball cannot be snookered by a cushion.
Source: Official Rules of the Games of Snooker and English Billiards, v. Nov 2019
Survey results: youtube.com/CesarMuroya/C...
Cesar Muroya
ANSWER - Snookered
Q - In which cases is the cue-ball snookered?
Although we habitually call it snookered only when it is fully blocked, the official definition is quite different: it is snookered when each Ball on is blocked, even partially, by a Ball not on.
The free ball and other rules are based on this definition.
Case A. Snookered
The green blocks the right-hand side of the furthest red (the other red doesn't count), and the yellow blocks the right-hand side of the closest red.
Case B. Not snookered
It is helpful to analyze each red as if the other reds don't exist (see image). The furthest red is not blocked by any colour, not even partially. Thus, the cue-ball is not snookered.
Case C. Not a free ball
You can hit both sides if you place the cue-ball very close to the red, which means it is not snookered.
Remember, after a foul, it is a free ball if, and only if, the cue-ball is snookered.
The correct option is thus the fifth.
Responded correctly: 6%
Official definition
Section 2.17 Snookered
The cue-ball is snookered when a direct stroke in a straight line to every ball on is wholly or partially obstructed by a ball or balls not on. If one or more balls on can be hit at both extreme edges free of obstruction by any ball not on, the cue-ball is not snookered.
(a) If in-hand, the cue-ball is snookered if it is obstructed as described above from all possible positions on or within the lines of the āDā.
(b) If the cue-ball is so obstructed from hitting a ball on by more than one ball not on:
(i) the ball nearest to the cue-ball is considered to be the effective snookering ball; and
(ii) should more than one obstructing ball be equidistant from the cue-ball, all such balls will be considered to be effective snookering balls.
(c) When Red is the ball on, if the cue-ball is obstructed from hitting different Reds by different balls not on, there is no effective snookering ball.
(d) The striker is said to be snookered when the cue-ball is snookered as above.
(e) The cue-ball cannot be snookered by a cushion.
Source: Official Rules of the Games of Snooker and English Billiards, v. Nov 2019
Survey results: youtube.com/CesarMuroya/C...
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