die Läuferin
female runner
A female person who runs as a sport or leisure activity.
Die Läuferin trainiert jeden Tag für den bevorstehenden Marathon.
The female runner trains every day for the upcoming marathon.

female runner / bishop
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female runner
A female person who runs as a sport or leisure activity.
Die Läuferin trainiert jeden Tag für den bevorstehenden Marathon.
The female runner trains every day for the upcoming marathon.

'Läuferin' (female runner) is the feminine form of 'Läufer' (runner). The ending '-in' is used by default in German to form the feminine form from a masculine term for a person.
Jede Teilnehmerin des Rennens war eine erfahrene Läuferin.
Every female participant in the race was an experienced runner.
In a sports context, 'Läuferin' (female runner) is often combined with verbs like 'trainieren' (to train), 'teilnehmen an' (to participate in), or adjectives like 'schnell' (fast), 'erfahren' (experienced), and 'begeistert' (enthusiastic).
Als begeisterte Läuferin nimmt sie an vielen lokalen Wettkämpfen teil.
As an enthusiastic runner, she participates in many local competitions.
You can clearly recognize the meaning as a chess piece from the context. Words like 'Schach' (chess), 'Brett' (board), 'Figur' (piece), 'Partie' (game), or the mention of squares, e.g. 'weißfeldrig' (light-squared), signal this special meaning.
Er opferte seine Läuferin, um die gegnerische Dame zu schlagen.
He sacrificed his bishop in order to capture the opponent's queen.
runner / runner rug / bishop
'der Läufer' and 'die Läuferin' can both refer to a person who runs. The most important difference is gender: 'der Läufer' means a man or is sometimes used generally, while 'die Läuferin' means a woman. In chess, the piece is normally called 'der Läufer' (bishop); 'die Läuferin' as the feminine form is possible, but less common. The words can be confused because they look almost the same. Pay special attention to the article: 'der' for the masculine form, 'die' for the feminine form.

Die Läuferin kam kurz vor dem Ziel noch an zwei anderen vorbei.
The female runner passed two others shortly before the finish line.
Der Läufer trainiert jeden Morgen im Park.
The runner trains in the park every morning.