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Explication
Une colonne est ouverte lorsqu'elle ne contient aucun pion blanc ni noir. Les tours et la dame peuvent s'y déplacer tant qu'aucune pièce ne bloque leur trajet.
Elle offre une voie de pression et d'entrée dans le camp adverse. Son occupation ne garantit toutefois aucun avantage si l'adversaire la conteste ou contrôle les cases d'invasion.
Contrôler n'est pas pénétrer
Pour exploiter la colonne, cherchez une case d'entrée sûre ou une cible concrète. Sans cela, son contrôle peut avoir peu de valeur immédiate.
Une contient les pions d'un seul camp, tandis qu'une contient des pions des deux camps.
Confusions fréquentes
Colonne ouverte et ligne dégagée
La définition dépend des pions. D'autres pièces peuvent occuper la colonne sans qu'elle cesse d'être ouverte.
Sources
- 1.File, Chess.com
- 2.Open file, Wikipedia
- 3.FIDE Laws of Chess taking effect from 1 January 2023, FIDE