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
a1d1
a1c1
a1b1
a1a4
a1a3
a1a2
e1b1
e1c1
e1d1
e1f1
e1e6
e1e5
e1e4
e1e3
e1e2
g1h1
g1g2
g1f1
b2b3
d2c4
d2e4
d2b1
d2b3
d2f1
d2f3
f2f4
f2f3
h2h4
h2h3
c3c4
g3g4
b4a2
b4a6
b4c2
b4c6
b4d3
b4d5
a5a6

## Board State Fen
1rr3k1/pp2nppp/4pn2/P2p4/1N1P4/2P3P1/1P1N1P1P/R3R1K1 w - - 1 20
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
a1d1
a1c1
a1b1
a1a4
a1a3
a1a2
e1b1
e1c1
e1d1
e1f1
e1e6
e1e5
e1e4
e1e3
e1e2
g1h1
g1g2
g1f1
b2b3
d2c4
d2e4
d2b1
d2b3
d2f1
d2f3
f2f4
f2f3
h2h4
h2h3
c3c4
g3g4
b4a2
b4a6
b4c2
b4c6
b4d3
b4d5
a5a6

## Board State Fen
1rr3k1/pp2nppp/4pn2/P2p4/1N1P4/2P3P1/1P1N1P1P/R3R1K1 w - - 1 20
assistant
b4d3