Puzzle of the week #294

Level: 
4-Rook
Chess Diagram: 

[Event "Puzzle #294"][Date "2016.03.14"][Result "1-0"][SetUp "1"][FEN "2b3q1/8/7p/4P1p1/1p1pNp2/3PkP2/4P3/4K3 w - - 0 1"]

In this study white has to achieve an ambitious result (win), given the overwhelming material advantage on the black side: Your tasks:
a) Explain what is the need for each piece or group of pieces (like the pawns) on the chessboard; is there a piece not needed?
b) White to move and win
Total available points for this puzzle is 20. The answers will be published next time together with puzzle #295.

Puzzle #293 solution:
Rink, study 1903. The best answers:
a) Coco: "White is going to take advantage of Black's seemingly open, but actually limited queen's positioning. If the whole back rank is attacked, then the queen could only move to the following squares: Qe6, Qc4, Qa2, and Qh7 without visibly losing material ... yet. As a brief explanation, White's plan should be to trap the black queen, gain material, and promote."
b) The solution is:

[Event "Puzzle #293"][Date "2016.03.06"][Result "1-0"][SetUp "1"][FEN "6q1/6p1/2k4p/R6B/p7/8/2P3P1/2K5 w - - 0 1"]1.Ra8! Qa2 (1... Qxa8 2.Bf3+) (1... Qe6 2.Ra6+) (1... Qc4 2.Rc8+) (1... Qh7 2.Bg6 Qxg6 3.Ra6+) 2.Rxa4 Qg8 3.Ra8 Qh7 4.Bg6!! Qxg6 5.Ra6+

Correct solutions:
Coco, Jalen - 18 points
Ethan - 15 points
Cody, Bradley - 13 points
Deryk, Aaron - 5 points
Benjamin, Daniel - 4 points
Yakov - 2 points

Standings:
Jalen - 104 points
Bradley - 97 points
Daniel - 72 points
Deryk - 69 points
Coco - 66 points
Benjamin - 64 points
Cody - 38 points
Aaron - 46 points
Yakov - 41 points
Ethan - 15 points
Shya - 10 points
Dheera - 5 points

Comment: 

Interference