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
b5b4
c5a3
c5b4
c5d4
c5f8
c5e7
c5d6
a6a5
b6a5
b6a7
b6d8
b6c7
b6d6
b6c6
b6b7
e6e5
f6e4
f6g4
f6g8
f6d5
f6h5
d7d5
d7d6
g7g5
g7g6
h7h5
h7h6
a8a7
b8c6
c8b7
e8g8
e8f8
e8e7
e8d8
h8f8
h8g8

## Board State Fen
rnb1k2r/3p1ppp/pq2pn2/1pb5/3NP3/3BB3/PPP1NPPP/R2Q1RK1 b kq - 7 9
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
b5b4
c5a3
c5b4
c5d4
c5f8
c5e7
c5d6
a6a5
b6a5
b6a7
b6d8
b6c7
b6d6
b6c6
b6b7
e6e5
f6e4
f6g4
f6g8
f6d5
f6h5
d7d5
d7d6
g7g5
g7g6
h7h5
h7h6
a8a7
b8c6
c8b7
e8g8
e8f8
e8e7
e8d8
h8f8
h8g8

## Board State Fen
rnb1k2r/3p1ppp/pq2pn2/1pb5/3NP3/3BB3/PPP1NPPP/R2Q1RK1 b kq - 7 9
assistant
f6g4