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
c1d2
d1f1
d1e1
d1d3
d1d2
g1h1
g1f1
a2b1
a2f7
a2e6
a2d5
a2c4
a2b3
b2b4
b2b3
e2b5
e2c4
e2d3
e2f1
e2h5
e2g4
e2f3
e2c2
e2d2
e2e1
f2f4
f2f3
g2g4
g2g3
h2h4
h2h3
a3a4
d4c2
d4c6
d4e6
d4b3
d4b5
d4f3
d4f5

## Board State Fen
r4rk1/1b2qppp/p7/1pn1p3/3Nn3/P3P3/BP2QPPP/R1BR2K1 w - - 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
a1b1
c1d2
d1f1
d1e1
d1d3
d1d2
g1h1
g1f1
a2b1
a2f7
a2e6
a2d5
a2c4
a2b3
b2b4
b2b3
e2b5
e2c4
e2d3
e2f1
e2h5
e2g4
e2f3
e2c2
e2d2
e2e1
f2f4
f2f3
g2g4
g2g3
h2h4
h2h3
a3a4
d4c2
d4c6
d4e6
d4b3
d4b5
d4f3
d4f5

## Board State Fen
r4rk1/1b2qppp/p7/1pn1p3/3Nn3/P3P3/BP2QPPP/R1BR2K1 w - - 0 18
assistant
f2f3