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
a1d1
a1c1
a1b1
e1d2
e1b1
e1c1
e1d1
e1f1
e1e8
e1e7
e1e6
e1e5
e1e4
e1e3
e1e2
g1h1
g1f1
a2a4
a2a3
b2b4
b2b3
g2g4
g2g3
h2h4
h2h3
c3c4
f3e5
f3g5
f3d2
f3h4
f4c1
f4d2
f4e3
f4c7
f4d6
f4e5
f4g3
f4h6
f4g5

## Board State Fen
r2q2k1/ppp2p1p/5bp1/3p1n2/3P1B2/2P2N2/PP3PPP/R3Q1K1 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
a1d1
a1c1
a1b1
e1d2
e1b1
e1c1
e1d1
e1f1
e1e8
e1e7
e1e6
e1e5
e1e4
e1e3
e1e2
g1h1
g1f1
a2a4
a2a3
b2b4
b2b3
g2g4
g2g3
h2h4
h2h3
c3c4
f3e5
f3g5
f3d2
f3h4
f4c1
f4d2
f4e3
f4c7
f4d6
f4e5
f4g3
f4h6
f4g5

## Board State Fen
r2q2k1/ppp2p1p/5bp1/3p1n2/3P1B2/2P2N2/PP3PPP/R3Q1K1 w - - 0 18
assistant
e1d2