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
a1a5
a1a4
a1a3
a1a2
e1b1
e1c1
e1d1
e1f1
e1e3
e1e2
g1h1
g1f1
b2b4
b2b3
c2c4
c2c3
g2g4
g2g3
h2h4
h2h3
f3e5
f3g5
f3d2
f3d4
f3h4

## Board State Fen
4rrk1/1p1n2pp/p3p3/b1p1p3/4P3/5N2/1PP2PPP/R3R1K1 w - - 0 19
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
a1a5
a1a4
a1a3
a1a2
e1b1
e1c1
e1d1
e1f1
e1e3
e1e2
g1h1
g1f1
b2b4
b2b3
c2c4
c2c3
g2g4
g2g3
h2h4
h2h3
f3e5
f3g5
f3d2
f3d4
f3h4

## Board State Fen
4rrk1/1p1n2pp/p3p3/b1p1p3/4P3/5N2/1PP2PPP/R3R1K1 w - - 0 19
assistant
a1a5