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
a1c1
a1b1
d1b3
d1c2
d1h5
d1g4
d1f3
d1e2
d1b1
d1c1
d1d7
d1d6
d1d5
d1d4
d1d3
d1d2
e1f1
e1e4
e1e3
e1e2
g1h1
g1f1
a2a4
a2b3
a2a3
g2g4
g2g3
h2h4
h2h3
e5e6
b7a6
b7a8
b7f3
b7e4
b7d5
b7c6
b7c8

## Board State Fen
r4rk1/1B1pqpp1/pb5p/1p2P3/8/1n6/PP3PPP/R2QR1K1 w - - 0 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
a1c1
a1b1
d1b3
d1c2
d1h5
d1g4
d1f3
d1e2
d1b1
d1c1
d1d7
d1d6
d1d5
d1d4
d1d3
d1d2
e1f1
e1e4
e1e3
e1e2
g1h1
g1f1
a2a4
a2b3
a2a3
g2g4
g2g3
h2h4
h2h3
e5e6
b7a6
b7a8
b7f3
b7e4
b7d5
b7c6
b7c8

## Board State Fen
r4rk1/1B1pqpp1/pb5p/1p2P3/8/1n6/PP3PPP/R2QR1K1 w - - 0 18
assistant
a2b3