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
c1b2
c1e3
c1d2
a1b1
a1a2
d1a4
d1b3
d1c2
d1h5
d1g4
d1f3
d1e2
d1d8
d1d7
d1d6
d1d5
d1d4
d1d3
d1d2
h1f1
h1g1
f2e3
f2f3
g2g4
g2g3
h2h4
h2h3
a3a4
b4c5
b4b5
f4e2
f4e6
f4g6
f4d3
f4d5
f4h3
f4h5

## Board State Fen
r4rk1/p4ppp/qp3n2/2n5/1P3N2/P3p3/5PPP/R1BQK2R w KQ - 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
c1b2
c1e3
c1d2
a1b1
a1a2
d1a4
d1b3
d1c2
d1h5
d1g4
d1f3
d1e2
d1d8
d1d7
d1d6
d1d5
d1d4
d1d3
d1d2
h1f1
h1g1
f2e3
f2f3
g2g4
g2g3
h2h4
h2h3
a3a4
b4c5
b4b5
f4e2
f4e6
f4g6
f4d3
f4d5
f4h3
f4h5

## Board State Fen
r4rk1/p4ppp/qp3n2/2n5/1P3N2/P3p3/5PPP/R1BQK2R w KQ - 0 18
assistant
b4c5