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
a7a5
a7a6
d6d5
d7e5
d7b8
d7f6
g6g5
b6b5
b7a6
b7e4
b7d5
b7c6
b7c8
e6e5
c5d4
e7d8
e7h4
e7g5
e7f6
e7e8
f7f5
f7f6
g7d4
g7e5
g7f6
g7h6
g7h8
h7h5
h7h6
a8e8
a8d8
a8c8
a8b8
f8b8
f8c8
f8d8
f8e8
g8h8

## Board State Fen
r4rk1/pb1nqpbp/1p1pp1p1/2p5/2PPP2P/1PN2NP1/P1Q2PB1/3RR1K1 b - - 0 16
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
a7a5
a7a6
d6d5
d7e5
d7b8
d7f6
g6g5
b6b5
b7a6
b7e4
b7d5
b7c6
b7c8
e6e5
c5d4
e7d8
e7h4
e7g5
e7f6
e7e8
f7f5
f7f6
g7d4
g7e5
g7f6
g7h6
g7h8
h7h5
h7h6
a8e8
a8d8
a8c8
a8b8
f8b8
f8c8
f8d8
f8e8
g8h8

## Board State Fen
r4rk1/pb1nqpbp/1p1pp1p1/2p5/2PPP2P/1PN2NP1/P1Q2PB1/3RR1K1 b - - 0 16
assistant
c5d4