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
a4d7
a4c6
a4b5
a4a1
a4a2
a4a3
a4d4
a4c4
a4b4
a4a5
a6a5
f7f5
f7f6
d8a8
d8b8
d8c8
d8d4
d8d5
d8d6
d8d7
e8b5
e8c6
e8d7
g8g7

## Board State Fen
3rb1k1/5pP1/p3p3/4N2Q/q2PN3/6P1/1K4P1/3R3R b - - 4 31
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
a4d7
a4c6
a4b5
a4a1
a4a2
a4a3
a4d4
a4c4
a4b4
a4a5
a6a5
f7f5
f7f6
d8a8
d8b8
d8c8
d8d4
d8d5
d8d6
d8d7
e8b5
e8c6
e8d7
g8g7

## Board State Fen
3rb1k1/5pP1/p3p3/4N2Q/q2PN3/6P1/1K4P1/3R3R b - - 4 31
assistant
a4b4