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
a1e1
a1d1
a1c1
a1b1
f1b1
f1c1
f1d1
f1e1
g1h1
a2a4
a2a3
b2b4
b2b3
f2f4
f2f3
g2g4
g2g3
h2h4
h2h3
c3a5
c3b4
c3e1
c3d2
d4c2
d4c6
d4e2
d4e6
d4b3
d4b5
d4f3
d4f5
e4e5

## Board State Fen
2br2k1/1p2bppp/rp2p3/8/3NP3/2B5/PP3PPP/R4RK1 w - - 0 15
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
a1e1
a1d1
a1c1
a1b1
f1b1
f1c1
f1d1
f1e1
g1h1
a2a4
a2a3
b2b4
b2b3
f2f4
f2f3
g2g4
g2g3
h2h4
h2h3
c3a5
c3b4
c3e1
c3d2
d4c2
d4c6
d4e2
d4e6
d4b3
d4b5
d4f3
d4f5
e4e5

## Board State Fen
2br2k1/1p2bppp/rp2p3/8/3NP3/2B5/PP3PPP/R4RK1 w - - 0 15
assistant
a2a4