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
e1d1
e1f1
e1e8
e1e7
e1e6
e1e5
e1e4
e1e3
e1e2
c1a3
c1b2
c1h6
c1g5
c1f4
c1e3
c1d2
g1h1
g1g2
g1f1
h2h4
h2h3
f3f4
a4a1
a4a2
a4a3
a4b4
a4a7
a4a6
a4a5
c4b2
c4b6
c4d2
c4d6
c4a3
c4a5
c4e3
c4e5
b5b6

## Board State Fen
r4rk1/p2p2pp/5bp1/1P1b4/R1NP4/5P2/5P1P/2B1R1K1 w - - 0 23
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
e1d1
e1f1
e1e8
e1e7
e1e6
e1e5
e1e4
e1e3
e1e2
c1a3
c1b2
c1h6
c1g5
c1f4
c1e3
c1d2
g1h1
g1g2
g1f1
h2h4
h2h3
f3f4
a4a1
a4a2
a4a3
a4b4
a4a7
a4a6
a4a5
c4b2
c4b6
c4d2
c4d6
c4a3
c4a5
c4e3
c4e5
b5b6

## Board State Fen
r4rk1/p2p2pp/5bp1/1P1b4/R1NP4/5P2/5P1P/2B1R1K1 w - - 0 23
assistant
c4e5