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
e1b1
e1c1
e1d1
e1f1
e1e3
e1e2
b2b4
b2b3
g1h1
g1f1
a2a4
a2a3
a1d1
a1c1
a1b1
g2g4
g2g3
h2h4
h2h3
f3e5
f3d2
f3h4
d4d5
e4b1
e4c2
e4d3
e4c6
e4d5
e4g6
e4f5
e4e2
e4e3
e4h4
e4g4
e4f4
e4e8
e4e7
e4e6
e4e5
g5c1
g5d2
g5e3
g5f4
g5d8
g5e7
g5f6
g5h4
g5h6

## Board State Fen
r4rk1/1p1n1p1p/p1pb2p1/q5B1/3PQ3/5N2/PP3PPP/R3R1K1 w - - 5 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
e1b1
e1c1
e1d1
e1f1
e1e3
e1e2
b2b4
b2b3
g1h1
g1f1
a2a4
a2a3
a1d1
a1c1
a1b1
g2g4
g2g3
h2h4
h2h3
f3e5
f3d2
f3h4
d4d5
e4b1
e4c2
e4d3
e4c6
e4d5
e4g6
e4f5
e4e2
e4e3
e4h4
e4g4
e4f4
e4e8
e4e7
e4e6
e4e5
g5c1
g5d2
g5e3
g5f4
g5d8
g5e7
g5f6
g5h4
g5h6

## Board State Fen
r4rk1/1p1n1p1p/p1pb2p1/q5B1/3PQ3/5N2/PP3PPP/R3R1K1 w - - 5 18
assistant
a2a3