Meanings of double solitaire in inglés

Kayak and Boreland were engaged in a close game of double solitaire.

She taught one of them to play double solitaire that very evening.

"I know a capital double solitaire-

"She's asleep?" She was sitting across the big table from my grandmother, smoking a cigarette and playing double solitaire on the vinyl, floral-patterned tablecloth.