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
a1a2
d1a4
d1b3
d1c2
d1b1
d1c1
d1d4
d1d3
d1d2
e1g1
e1f1
h1f1
h1g1
b2b3
e2b5
e2c4
e2d3
e2f1
e2h5
e2g4
e2f3
f2f4
f2f3
g2g4
g2g3
h2h4
h2h3
a3a4
c3c4
b4a2
b4a6
b4c2
b4c6
b4d3
d5c7
d5e3
d5e7
d5b6
d5f4
d5f6

## Board State Fen
1r1q1rk1/1b3ppp/2np4/pp1Np1b1/1N2P3/P1P5/1P2BPPP/R2QK2R w KQ - 0 16
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
a1a2
d1a4
d1b3
d1c2
d1b1
d1c1
d1d4
d1d3
d1d2
e1g1
e1f1
h1f1
h1g1
b2b3
e2b5
e2c4
e2d3
e2f1
e2h5
e2g4
e2f3
f2f4
f2f3
g2g4
g2g3
h2h4
h2h3
a3a4
c3c4
b4a2
b4a6
b4c2
b4c6
b4d3
d5c7
d5e3
d5e7
d5b6
d5f4
d5f6

## Board State Fen
1r1q1rk1/1b3ppp/2np4/pp1Np1b1/1N2P3/P1P5/1P2BPPP/R2QK2R w KQ - 0 16
assistant
b4c6