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
a4a5
a4a3
b5b4
h4h3
d5a2
d5b3
d5c4
d5a8
d5b7
d5c6
d5f3
d5e4
d5e6
f7f5
f7f6

## Board State Fen
8/5p2/8/1p1b4/k4p1p/2PB1P2/2K3P1/8 b - - 21 65
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
a4a5
a4a3
b5b4
h4h3
d5a2
d5b3
d5c4
d5a8
d5b7
d5c6
d5f3
d5e4
d5e6
f7f5
f7f6

## Board State Fen
8/5p2/8/1p1b4/k4p1p/2PB1P2/2K3P1/8 b - - 21 65
assistant
a4a5