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
a1b1
c1e3
c1d2
e1e2
e1d1
h1f1
h1g1
a2a4
a2a3
b2b3
c2b1
c2a4
c2b3
c2d1
c2g2
c2f2
c2e2
c2d2
d3a6
d3b5
d3c4
d3f1
d3e2
d3e4
g3g4
d4c6
d4e2
d4e6
d4b3
d4b5
d4f3
d4f5
f4f5
e5e6

## Board State Fen
r1b2rk1/pp1n1ppp/8/3pP3/1b1NnP2/2NB2Pq/PPQ4P/R1B1K2R w KQ - 1 13
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
a1b1
c1e3
c1d2
e1e2
e1d1
h1f1
h1g1
a2a4
a2a3
b2b3
c2b1
c2a4
c2b3
c2d1
c2g2
c2f2
c2e2
c2d2
d3a6
d3b5
d3c4
d3f1
d3e2
d3e4
g3g4
d4c6
d4e2
d4e6
d4b3
d4b5
d4f3
d4f5
f4f5
e5e6

## Board State Fen
r1b2rk1/pp1n1ppp/8/3pP3/1b1NnP2/2NB2Pq/PPQ4P/R1B1K2R w KQ - 1 13
assistant
c1d2