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
b4a2
b4a6
b4c2
b4d3
b4d5
a5a4
b6b5
c6d5
c6c5
e6d5
b7a6
b7c8
d7c5
d7e5
d7b8
d7f6
e7c5
e7d6
e7h4
e7g5
e7f6
f7f5
f7f6
g7g5
g7g6
h7h5
h7h6
a8a6
a8a7
a8c8
a8b8
d8c7
d8b8
d8c8
d8e8
f8e8
g8h8

## Board State Fen
r2q1rk1/1b1nbppp/1pp1p3/p2PP3/1n1P4/5NP1/PP1N1PBP/RQBR2K1 b - - 2 13
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
b4a2
b4a6
b4c2
b4d3
b4d5
a5a4
b6b5
c6d5
c6c5
e6d5
b7a6
b7c8
d7c5
d7e5
d7b8
d7f6
e7c5
e7d6
e7h4
e7g5
e7f6
f7f5
f7f6
g7g5
g7g6
h7h5
h7h6
a8a6
a8a7
a8c8
a8b8
d8c7
d8b8
d8c8
d8e8
f8e8
g8h8

## Board State Fen
r2q1rk1/1b1nbppp/1pp1p3/p2PP3/1n1P4/5NP1/PP1N1PBP/RQBR2K1 b - - 2 13
assistant
b4d5