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
d1b3
d1c2
d1e2
d1b1
d1c1
d1d2
d3d4
g2g4
g2g3
h2h4
h2h3
e1f1
e1e2
e3d5
e3f1
e3f5
e3c2
e3c4
e3g4
c3c4
g1h1
g1f1
a1c1
a1b1
a1a3
a1a2
f3e5
f3g5
f3d2
f3d4
f3h4
b4a5
b4b5

## Board State Fen
r2q2k1/1pp2pp1/2nprn1p/p3p3/PP2P3/2PPNN2/5PPP/R2QR1K1 w - - 0 15
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
d1b3
d1c2
d1e2
d1b1
d1c1
d1d2
d3d4
g2g4
g2g3
h2h4
h2h3
e1f1
e1e2
e3d5
e3f1
e3f5
e3c2
e3c4
e3g4
c3c4
g1h1
g1f1
a1c1
a1b1
a1a3
a1a2
f3e5
f3g5
f3d2
f3d4
f3h4
b4a5
b4b5

## Board State Fen
r2q2k1/1pp2pp1/2nprn1p/p3p3/PP2P3/2PPNN2/5PPP/R2QR1K1 w - - 0 15
assistant
b4b5