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
b4a3
b4a5
b4e1
b4d2
b4c3
b4f8
b4e7
b4d6
b4c5
f6f5
g6g5
a7a5
a7a6
b7b6
c7c5
c7c6
d7b5
d7c6
d7h3
d7g4
d7f5
d7e6
d7e8
c8b8
d8g8
d8f8
d8e8
h8e8
h8f8
h8g8
h8h4
h8h5
h8h6
h8h7

## Board State Fen
2kr3r/pppb2p1/5pp1/1P6/Pb5P/4P3/1B2BPP1/R4K1R b - - 2 19
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
b4a3
b4a5
b4e1
b4d2
b4c3
b4f8
b4e7
b4d6
b4c5
f6f5
g6g5
a7a5
a7a6
b7b6
c7c5
c7c6
d7b5
d7c6
d7h3
d7g4
d7f5
d7e6
d7e8
c8b8
d8g8
d8f8
d8e8
h8e8
h8f8
h8g8
h8h4
h8h5
h8h6
h8h7

## Board State Fen
2kr3r/pppb2p1/5pp1/1P6/Pb5P/4P3/1B2BPP1/R4K1R b - - 2 19
assistant
b4c5