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
c2b1
c2a4
c2b3
c2d1
c2h7
c2g6
c2f5
c2e4
c2d3
g1h1
g1g2
g1f1
b2b4
b2b3
a2a4
a2a3
a1f1
a1e1
a1d1
a1c1
a1b1
d2d1
d2e2
d2d4
d2d3
h2h4
h2h3
c3d4
c3c4
e3d4
e3h6
e3g5
e3f4
f3f4

## Board State Fen
r2r2k1/1p2nppp/p3n3/8/3b4/2P1BP2/PPBR1P1P/R5K1 w - - 0 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
c2b1
c2a4
c2b3
c2d1
c2h7
c2g6
c2f5
c2e4
c2d3
g1h1
g1g2
g1f1
b2b4
b2b3
a2a4
a2a3
a1f1
a1e1
a1d1
a1c1
a1b1
d2d1
d2e2
d2d4
d2d3
h2h4
h2h3
c3d4
c3c4
e3d4
e3h6
e3g5
e3f4
f3f4

## Board State Fen
r2r2k1/1p2nppp/p3n3/8/3b4/2P1BP2/PPBR1P1P/R5K1 w - - 0 21
assistant
e3d4