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
b1a3
b1d2
c1a3
c1b2
c1h6
c1g5
c1f4
c1e3
c1d2
d1a4
d1b3
d1c2
d1e2
d1f1
d1e1
d1d2
g1h2
g1h1
g1f1
a2a4
a2a3
g2g4
g2g3
d3d4
f3e1
f3g5
f3d2
f3d4
f3h2
f3h4
h3h4
c4b3
c4f7
c4e6
c4d5
b5b6
e5c5
e5d5
e5e1
e5e2
e5e3
e5e4
e5h5
e5g5
e5f5
e5e7
e5e6

## Board State Fen
r2q1rk1/ppp1bppp/5n2/nP2R2b/2B5/2PP1N1P/P4PP1/RNBQ2K1 w - - 1 13
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
b1a3
b1d2
c1a3
c1b2
c1h6
c1g5
c1f4
c1e3
c1d2
d1a4
d1b3
d1c2
d1e2
d1f1
d1e1
d1d2
g1h2
g1h1
g1f1
a2a4
a2a3
g2g4
g2g3
d3d4
f3e1
f3g5
f3d2
f3d4
f3h2
f3h4
h3h4
c4b3
c4f7
c4e6
c4d5
b5b6
e5c5
e5d5
e5e1
e5e2
e5e3
e5e4
e5h5
e5g5
e5f5
e5e7
e5e6

## Board State Fen
r2q1rk1/ppp1bppp/5n2/nP2R2b/2B5/2PP1N1P/P4PP1/RNBQ2K1 w - - 1 13
assistant
b1d2