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
a2a1
a2c2
a2b2
a2a8
a2a7
a2a6
a2a5
a2a4
a2a3
c5b4
c5c4
e5d3
e5d7
e5f3
e5c4
e5c6
e5g4
e5g6
d6d5
e6b3
e6c4
e6d5
e6c8
e6d7
e6h3
e6g4
e6f5
c7c6
f7f5
f7f6
g7g5
g7g6
h7h5
h7h6
e8a8
e8b8
e8c8
e8d8
e8e7
e8f8
g8h8
g8f8

## Board State Fen
4r1k1/2p2ppp/3pb3/2p1n3/1P2P3/2R2PP1/r1PNB1P1/5RK1 b - - 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
a2a1
a2c2
a2b2
a2a8
a2a7
a2a6
a2a5
a2a4
a2a3
c5b4
c5c4
e5d3
e5d7
e5f3
e5c4
e5c6
e5g4
e5g6
d6d5
e6b3
e6c4
e6d5
e6c8
e6d7
e6h3
e6g4
e6f5
c7c6
f7f5
f7f6
g7g5
g7g6
h7h5
h7h6
e8a8
e8b8
e8c8
e8d8
e8e7
e8f8
g8h8
g8f8

## Board State Fen
4r1k1/2p2ppp/3pb3/2p1n3/1P2P3/2R2PP1/r1PNB1P1/5RK1 b - - 0 21
assistant
e5d7