Care must therefore be taken to avoid them ( but there are exceptions -- for instance see Boleslavsky hole below ) .
Weaknesses in the pawn structure , such as isolated , doubled or backward pawns and holes , once created , are usually permanent .
Care must be taken to avoid them ( but there are exceptions -- for instance see Boleslavsky hole below ) .
Weaknesses in the pawn structure , such as isolated , doubled or backward pawns and holes , once created , are usually permanent .