Changes

'''Open Pawns''' have no mechanical obstruction - an opponent pawn in front. They are at least half-free or even free [[Passed Pawn|passers]]. Thus, open pawns are a superset of passed pawns and half-free pawns like [[Candidate Passed Pawn|candidates]] but also weak pawns like the half-free [[Backward Pawns (Bitboards)#Straggler|straggler]] ([[Backward Pawn|backward pawn]] ) or half-free [[Isolated Pawn|isolanis]]. Open pawns are vulnerable from opponent rook-attacks on [[Half-open fileFile|half-open files]].