Chess Terms Beginning with 'U'

UCI
UCT
Ukrainian Two-Knights
Ultrabullet
Unclear (∞)
Uncommon Opening
undefended
undefended piece
Undefined
Under-X section
Underdog
undermining
underpromotion
Undisputed champion
Undisputed title
Unknown
Unknown Opening
Unknown Opening*
Unknown openings
Unrated
Unsound
Upfloat
Upset
Urusov Attack, KGA
Urusov Gambit
USCF
Last updated 2025-10-27