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
a2b1
a2b3
a2a5
a2a4
a2a3
b2b4
b2b3
f2f4
f2f3
g2g4
g2g3
h2h4
h2h3
c4b3
c4a6
c4b5
c4e2
c4d3
d5c7
d5e3
d5e7
d5b4
d5b6
d5f4
d5f6

## Board State Fen
rq3r1k/5ppp/2bp4/p2Np1b1/2B1P3/2P5/QP3PPP/R4RK1 w - - 6 21
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
a2b1
a2b3
a2a5
a2a4
a2a3
b2b4
b2b3
f2f4
f2f3
g2g4
g2g3
h2h4
h2h3
c4b3
c4a6
c4b5
c4e2
c4d3
d5c7
d5e3
d5e7
d5b4
d5b6
d5f4
d5f6

## Board State Fen
rq3r1k/5ppp/2bp4/p2Np1b1/2B1P3/2P5/QP3PPP/R4RK1 w - - 6 21
assistant
a2b1