Prophylaxis and Improving Pieces are two key concepts in chess strategy. Prophylaxis refers to a move or series of moves that is made to prevent the opponent from carrying out a certain plan. It is about anticipating the opponent's intentions and taking steps to neutralize them. Improving pieces, on the other hand, refers to a player's ability to reposition their pieces in a way that maximizes their potential. Both concepts are important for achieving a strong position and controlling the game. GM R B Ramesh gives some complex positions to Aravindh Chithambaram and Karthikeyan Murali where both of these play a big role.