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
b5a4
e5d4
a6a5
c6c5
d6d5
f6e4
f6g4
f6d5
f6h5
b7c8
d7c5
d7b6
d7b8
g7g5
g7g6
h7h5
h7h6
a8a7
a8c8
a8b8
d8a5
d8b6
d8c7
d8e7
d8b8
d8c8
e8e6
e8e7
f8e7
g8h8

## Board State Fen
r2qrbk1/1b1n1ppp/p1pp1n2/1p2p3/PP1PP3/2PB1N1P/3N1PP1/R1BQR1K1 b - b3 0 15
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
b5a4
e5d4
a6a5
c6c5
d6d5
f6e4
f6g4
f6d5
f6h5
b7c8
d7c5
d7b6
d7b8
g7g5
g7g6
h7h5
h7h6
a8a7
a8c8
a8b8
d8a5
d8b6
d8c7
d8e7
d8b8
d8c8
e8e6
e8e7
f8e7
g8h8

## Board State Fen
r2qrbk1/1b1n1ppp/p1pp1n2/1p2p3/PP1PP3/2PB1N1P/3N1PP1/R1BQR1K1 b - b3 0 15
assistant
d7b6