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
f1a6
f1b5
f1c4
f1d3
f1e2
g1f3
g1h3
g1e2
b1a3
b1c3
e1e2
e1d1
a2a4
a2a3
b2a3
b2c1
b2c3
c2c4
c2c3
d2c1
d2a5
d2b4
d2c3
d2h6
d2g5
d2f4
d2e3
d2d1
d2e2
d2d3
f2f4
f2f3
g2g4
g2g3
h2h4
h2h3
b3b4
d4d5

## Board State Fen
r1bqk2r/ppp1bppp/2np1n2/8/3P4/1P6/PBPQ1PPP/RN2KBNR w KQkq - 3 7
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
f1a6
f1b5
f1c4
f1d3
f1e2
g1f3
g1h3
g1e2
b1a3
b1c3
e1e2
e1d1
a2a4
a2a3
b2a3
b2c1
b2c3
c2c4
c2c3
d2c1
d2a5
d2b4
d2c3
d2h6
d2g5
d2f4
d2e3
d2d1
d2e2
d2d3
f2f4
f2f3
g2g4
g2g3
h2h4
h2h3
b3b4
d4d5

## Board State Fen
r1bqk2r/ppp1bppp/2np1n2/8/3P4/1P6/PBPQ1PPP/RN2KBNR w KQkq - 3 7
assistant
d4d5