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
a5a2
a5a3
a5a4
a5h5
a5g5
a5f5
a5e5
a5d5
a5c5
a5b5
a5a6
b4b3
b6a4
b6a8
b6c4
b6d5
b6d7
g6g5
a7a6
e7e5
e7e6
f7f5
f7f6
g7h8
g7g8
g7f8
g7f6
h7h5
h7h6
c8a8
c8b8
c8c6
c8c7
c8h8
c8g8
c8f8
c8e8
c8d8

## Board State Fen
2r5/p3ppkp/1nP3p1/q7/1p2P3/5P2/P2QBP1P/2R3K1 b - - 2 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
a5a2
a5a3
a5a4
a5h5
a5g5
a5f5
a5e5
a5d5
a5c5
a5b5
a5a6
b4b3
b6a4
b6a8
b6c4
b6d5
b6d7
g6g5
a7a6
e7e5
e7e6
f7f5
f7f6
g7h8
g7g8
g7f8
g7f6
h7h5
h7h6
c8a8
c8b8
c8c6
c8c7
c8h8
c8g8
c8f8
c8e8
c8d8

## Board State Fen
2r5/p3ppkp/1nP3p1/q7/1p2P3/5P2/P2QBP1P/2R3K1 b - - 2 21
assistant
b6a4