Given the available moves based on the current board state in FEN notation, think carefully about which move would be best, then make that move. Be sure to note your color indicated in the FEN notation before deciding.
## Available Moves
a4d1
a4c2
a4b3
a4e8
a4d7
a4c6
a4b5
h4e4
h4f4
h4g4
h4h1
h4h2
h4h3
h4h6
h4h5
g6g5
g7h8
g7h6
g7g8
g7f8
h7h5
h7h6

## Board State Fen
8/6kp/3N2p1/R3K3/b3P2r/8/8/8 b - - 0 42
system
You are a chess playing AI.
user
Given the available moves based on the current board state in FEN notation, think carefully about which move would be best, then make that move. Be sure to note your color indicated in the FEN notation before deciding.
## Available Moves
a4d1
a4c2
a4b3
a4e8
a4d7
a4c6
a4b5
h4e4
h4f4
h4g4
h4h1
h4h2
h4h3
h4h6
h4h5
g6g5
g7h8
g7h6
g7g8
g7f8
h7h5
h7h6

## Board State Fen
8/6kp/3N2p1/R3K3/b3P2r/8/8/8 b - - 0 42
assistant
a4b3