Acol
Acol is a traditional contract bridge bidding system that originated in the United Kingdom during the 1920s and is named for the Acol Bridge Club in London. It became one of the most widely used natural bidding systems in Britain and remains influential in club play, particularly in the British and Commonwealth bridge communities.
The system is characterized by natural and descriptive bidding. Openings at the one level typically show four
Over the decades, Acol has evolved into several variants and has been integrated with modern conventions, including