Difference between revisions of "Irrelevant move"
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| − | An '''irrelevant move''' is a move that does not improve the position of the player who makes the move. It is considered as a waste of time and | + | An '''irrelevant move''' or '''wasted move''' is a move that does not improve the position of the player who makes the move. It is considered as a waste of time and should be avoided. |
| − | + | Any move in a [[dead cell]] is irrelevant. An example of this is the [[useless triangle]]. If a player plays in a dead cell, the opponent does not have to respond, i.e., the situation is as if the player had passed. | |
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| + | Another example of an irrelevant move is a move in a cell that is already [[captured cell|captured]] by the same player. Such moves can also be ignored by the opponent, i.e., they are equivalent to passing. | ||
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| + | A move in a cell that is [[captured cell|captured]] by the opponent is also an irrelevant move, but sometimes the opponent is forced to respond to maintain the capture. While such a move does not improve the position of the player who makes it, it can sometimes happen that it does not improve the opponent's position either. Thus, the effect of such a move is in the best case neutral for the player who makes it. However, if the opponent has a better response available, such a move can still hurt the player who makes it. | ||
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| + | Any move that the opponent can [[dead cell|kill]] with the next move is also irrelevant, as it only helps the opponent and doesn't help the player. | ||
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| + | A move that does not interfere with any of the opponent's threats is also irrelevant. | ||
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| + | == Examples == | ||
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| + | Red to move. | ||
| + | <hexboard size="6x6" | ||
| + | coords="top left" | ||
| + | contents="B b2 c1 d1 d2 R f1 E *:c2 *:e1 R e5 E *:d6 R c4 B e4 E *:f3 *:b5" | ||
| + | /> | ||
| + | A red move at c2 would be irrelevant because it is in a [[useless triangle]] (therefore [[dead cell|dead]]). | ||
| + | A red move at e1 would be irrelevant because e1 is also dead. | ||
| + | A red move at d6 would be irrelevant because d6 is already [[captured cell|captured]] by Red. | ||
| + | A red move at f3 would be irrelevant because f3 is already captured by Blue. Blue could in principle respond at f4 to [[dead cell|kill]] f3, showing that f3 had no possible benefit for Red. (However, it is much better for Blue to instead respond at e3, which is winning for Blue, unlike f4, which is losing). | ||
| + | A red move at b5 would be irrelevant because it is not in the path of any of Blue's threatened connections. | ||
[[Category:Definition]] | [[Category:Definition]] | ||
Revision as of 04:29, 25 December 2020
An irrelevant move or wasted move is a move that does not improve the position of the player who makes the move. It is considered as a waste of time and should be avoided.
Any move in a dead cell is irrelevant. An example of this is the useless triangle. If a player plays in a dead cell, the opponent does not have to respond, i.e., the situation is as if the player had passed.
Another example of an irrelevant move is a move in a cell that is already captured by the same player. Such moves can also be ignored by the opponent, i.e., they are equivalent to passing.
A move in a cell that is captured by the opponent is also an irrelevant move, but sometimes the opponent is forced to respond to maintain the capture. While such a move does not improve the position of the player who makes it, it can sometimes happen that it does not improve the opponent's position either. Thus, the effect of such a move is in the best case neutral for the player who makes it. However, if the opponent has a better response available, such a move can still hurt the player who makes it.
Any move that the opponent can kill with the next move is also irrelevant, as it only helps the opponent and doesn't help the player.
A move that does not interfere with any of the opponent's threats is also irrelevant.
Examples
Red to move.
A red move at c2 would be irrelevant because it is in a useless triangle (therefore dead). A red move at e1 would be irrelevant because e1 is also dead. A red move at d6 would be irrelevant because d6 is already captured by Red. A red move at f3 would be irrelevant because f3 is already captured by Blue. Blue could in principle respond at f4 to kill f3, showing that f3 had no possible benefit for Red. (However, it is much better for Blue to instead respond at e3, which is winning for Blue, unlike f4, which is losing). A red move at b5 would be irrelevant because it is not in the path of any of Blue's threatened connections.
