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
b6a4
b6c4
b6c8
b6d7
f5d3
f5e4
f5c8
f5d7
f5e6
f5h3
f5g4
f5h7
f5g6
c6c5
d6a3
d6b4
d6c5
d6b8
d6c7
d6g3
d6f4
d6e5
d6f8
d6e7
f6e4
f6g4
f6d7
f6h5
f6h7
h6h5
g7g5
g7g6
a8a6
a8a7
a8c8
a8b8
d8c7
d8e7
d8b8
d8c8
d8d7
e8e3
e8e4
e8e5
e8e6
e8e7
e8f8
g8h8
g8h7
g8f8

## Board State Fen
r2qr1k1/1p3pp1/1npb1n1p/p2p1b2/P2P4/1PNNP1P1/1B3PBP/R2QR1K1 b - - 7 18
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
b6a4
b6c4
b6c8
b6d7
f5d3
f5e4
f5c8
f5d7
f5e6
f5h3
f5g4
f5h7
f5g6
c6c5
d6a3
d6b4
d6c5
d6b8
d6c7
d6g3
d6f4
d6e5
d6f8
d6e7
f6e4
f6g4
f6d7
f6h5
f6h7
h6h5
g7g5
g7g6
a8a6
a8a7
a8c8
a8b8
d8c7
d8e7
d8b8
d8c8
d8d7
e8e3
e8e4
e8e5
e8e6
e8e7
e8f8
g8h8
g8h7
g8f8

## Board State Fen
r2qr1k1/1p3pp1/1npb1n1p/p2p1b2/P2P4/1PNNP1P1/1B3PBP/R2QR1K1 b - - 7 18
assistant
f6e4