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
d1f3
d1e2
d1d4
d1d3
d1d2
e1f1
e1e3
e1e2
g1h2
g1h1
g1f1
a2a4
a2a3
b2b4
b2b3
c2c4
c2c3
f2f4
f2f3
g2f1
g2f3
g2h1
h3h4
e4e5
g4g5
d5c3
d5c7
d5e3
d5e7
d5b4
d5b6
d5f4
d5f6

## Board State Fen
r2qkb1r/1b1n1ppp/p2pp3/1p1N4/4P1P1/7P/PPP2PB1/R1BQR1K1 w kq - 4 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
c1h6
c1g5
c1f4
c1e3
c1d2
d1f3
d1e2
d1d4
d1d3
d1d2
e1f1
e1e3
e1e2
g1h2
g1h1
g1f1
a2a4
a2a3
b2b4
b2b3
c2c4
c2c3
f2f4
f2f3
g2f1
g2f3
g2h1
h3h4
e4e5
g4g5
d5c3
d5c7
d5e3
d5e7
d5b4
d5b6
d5f4
d5f6

## Board State Fen
r2qkb1r/1b1n1ppp/p2pp3/1p1N4/4P1P1/7P/PPP2PB1/R1BQR1K1 w kq - 4 13
assistant
d1d4