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
b1c3
b1d2
c1h6
c1g5
c1f4
c1e3
c1d2
d1a4
d1b3
d1c2
d1e1
d1d3
d1d2
f1e1
g1h1
a2a4
a2a3
b2b4
b2b3
e2e4
e2e3
f2f4
f2f3
g2b7
g2c6
g2d5
g2e4
g2f3
g2h1
g2h3
h2h4
h2h3
g3g4
c4b6
c4d2
c4d6
c4a3
c4a5
c4e3
c4e5
d4d5

## Board State Fen
r1bq1rk1/ppp1ppbp/1n3np1/8/2NP4/6P1/PP2PPBP/RNBQ1RK1 w - - 1 9
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
b1c3
b1d2
c1h6
c1g5
c1f4
c1e3
c1d2
d1a4
d1b3
d1c2
d1e1
d1d3
d1d2
f1e1
g1h1
a2a4
a2a3
b2b4
b2b3
e2e4
e2e3
f2f4
f2f3
g2b7
g2c6
g2d5
g2e4
g2f3
g2h1
g2h3
h2h4
h2h3
g3g4
c4b6
c4d2
c4d6
c4a3
c4a5
c4e3
c4e5
d4d5

## Board State Fen
r1bq1rk1/ppp1ppbp/1n3np1/8/2NP4/6P1/PP2PPBP/RNBQ1RK1 w - - 1 9
assistant
c4a5