Please 2 D Bridge move which may be executed in a situation such as a Vienna coup (7) U?B?O?K (Possible Unblock)
12 D Rarely executed move in chess ( 2,7) ?N ???S?N?
18 Ac Symbol used to guide ramblers, cyclists and riders exploring the National Trail series of routes around England and Wales (5) ????N
Thanks to any one who can be of assistance.
Thank you seekeerz and Oldred, I'n not a bridge player so I couldn't confirm unblock. I've heard en passant but forgot it was chess related, with regards to the acorn I must need a cuppa.