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
a1b1
c1a3
c1b2
c1h6
c1g5
c1f4
c1e3
c1d2
d1a4
d1b3
d1c2
d1e1
d1d4
d1d3
d1d2
f1h3
f1g2
h1g1
a2a4
a2a3
e2d4
e2f4
e2c3
e2g1
f2g2
f2g1
f2e1
h2h4
h2h3
f3f4
g3g4
c4c5

## Board State Fen
r1bq2k1/pp3ppp/2n2n2/4r3/2PpP3/5PP1/P3NK1P/R1BQ1B1R w - - 2 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
a1b1
c1a3
c1b2
c1h6
c1g5
c1f4
c1e3
c1d2
d1a4
d1b3
d1c2
d1e1
d1d4
d1d3
d1d2
f1h3
f1g2
h1g1
a2a4
a2a3
e2d4
e2f4
e2c3
e2g1
f2g2
f2g1
f2e1
h2h4
h2h3
f3f4
g3g4
c4c5

## Board State Fen
r1bq2k1/pp3ppp/2n2n2/4r3/2PpP3/5PP1/P3NK1P/R1BQ1B1R w - - 2 13
assistant
e2f4