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Explication
Une colonne est semi-ouverte lorsqu'un seul camp y conserve des pions. Il faut préciser le point de vue : sans pion blanc mais avec un pion noir, elle est semi-ouverte pour les Blancs.
La tour ou la dame du camp sans pion dispose d'une ligne directe vers le pion adverse. Si ce pion disparaît, la colonne peut devenir une .
Usages fréquents
- Attaquer le pion adverse de la colonne.
- Faire pression sur une case d'entrée.
- Fixer le pion par un .
- Obliger une pièce adverse à rester en défense.
La colonne semi-ouverte n'est pas automatiquement favorable. Le pion restant peut être bien défendu ou avancer avec tempo.
Confusions fréquentes
Semi-ouverte et fermée
Une contient des pions des deux couleurs. Une semi-ouverte n'en contient que d'une couleur.
Voir le termeSources
- 1.File, Chess.com
- 2.Half-open file, Wikipedia
- 3.FIDE Laws of Chess taking effect from 1 January 2023, FIDE