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
a1c1
a1b1
a1a5
a1a4
a1a3
a1a2
d1c3
d1e3
d1b2
d1f2
f1e1
f1f2
g1h2
g1h1
g1f2
c2c4
c2c3
g2g4
g2g3
b3b4
f3f4
e4e5

## Board State Fen
1rr3k1/4pp2/1n1p2p1/p6p/4P2P/1P3P2/2P3P1/R2N1RK1 w - - 2 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
a1c1
a1b1
a1a5
a1a4
a1a3
a1a2
d1c3
d1e3
d1b2
d1f2
f1e1
f1f2
g1h2
g1h1
g1f2
c2c4
c2c3
g2g4
g2g3
b3b4
f3f4
e4e5

## Board State Fen
1rr3k1/4pp2/1n1p2p1/p6p/4P2P/1P3P2/2P3P1/R2N1RK1 w - - 2 21
assistant
d1e3