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
c1h6
c1g5
c1f4
c1e3
c1d2
d1a4
d1b3
d1c2
d1h5
d1g4
d1f3
d1e2
d1d3
d1d2
e1f1
e1e7
e1e6
e1e5
e1e4
e1e3
e1e2
g1h2
g1h1
g1f1
a2a4
a2a3
b2b3
f2f4
f2f3
g2g4
g2g3
h3h4
d4d5

## Board State Fen
5rk1/pq1rpp1p/5np1/8/1p1P4/7P/PP3PP1/R1BQR1K1 w - - 1 21
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
c1h6
c1g5
c1f4
c1e3
c1d2
d1a4
d1b3
d1c2
d1h5
d1g4
d1f3
d1e2
d1d3
d1d2
e1f1
e1e7
e1e6
e1e5
e1e4
e1e3
e1e2
g1h2
g1h1
g1f1
a2a4
a2a3
b2b3
f2f4
f2f3
g2g4
g2g3
h3h4
d4d5

## Board State Fen
5rk1/pq1rpp1p/5np1/8/1p1P4/7P/PP3PP1/R1BQR1K1 w - - 1 21
assistant
c1e3