Endgame Studies for Beginners - GM Varuzhan Akobian
Wrong Rook Pawn Endgames - GM Ben Finegold
Rooks belong behind passed pawns
Principle of two weaknesses
Zugzwang and the principle of two weaknesses
常青藤国际象棋基本杀法(一)
常青藤国际象棋基本杀法(二)
常青藤国际象棋基本杀法(三)
常青藤国际象棋基本杀法(四)