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
b5a4
b5b4
h5h4
a6a5
c6c5
g6g5
b7a8
c7a5
c7b6
c7b8
c7e5
c7d6
d7c5
d7e5
d7b6
d7b8
d7f6
d7f8
e7a3
e7b4
e7c5
e7d6
e7h4
e7g5
e7f6
e7f8
f7f5
f7f6
c8b8
d8g8
d8f8
d8e8
h8e8
h8f8
h8g8
h8h6
h8h7

## Board State Fen
2kr3r/1bqnbp2/p1p1p1p1/1p2P2p/P1pP1P2/2P1NQP1/R5BP/R1B3K1 b - - 5 18
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
b5a4
b5b4
h5h4
a6a5
c6c5
g6g5
b7a8
c7a5
c7b6
c7b8
c7e5
c7d6
d7c5
d7e5
d7b6
d7b8
d7f6
d7f8
e7a3
e7b4
e7c5
e7d6
e7h4
e7g5
e7f6
e7f8
f7f5
f7f6
c8b8
d8g8
d8f8
d8e8
h8e8
h8f8
h8g8
h8h6
h8h7

## Board State Fen
2kr3r/1bqnbp2/p1p1p1p1/1p2P2p/P1pP1P2/2P1NQP1/R5BP/R1B3K1 b - - 5 18
assistant
h5h4