I would like to ask Mr. Robertie to comment two positions in accordance with the theory descrabed in his "Modern Backgammon" book: "If the nets were human, they would tell you that they guide their play according to four fundamental principles of maneuver. Arranged roughly in order of importance, the four principles are these: Efficiency, Connectivity, Non-Commitment, Robustness."

Here are problems 81 and 82 from the book "New Ideas in Backgammon" and I would like to ask which principle will guide the human to make this moves: Efficiency, Connectivity, Non-Commitment or Robustness?

Problem 81. White to play 1-1. 7/5(2)
Problem 82. White to play 2-2. 15/11(2)



Thanks in advance.