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
f5f4
a6a5
b6b5
h6h5
b7d5
b7c6
b7c8
e7a3
e7b4
e7c5
e7d6
e7d8
e7h4
e7g5
e7f6
e7c7
e7d7
e7e3
e7e4
e7e5
e7e6
e7e8
g7g5
g7g6
a8a7
a8e8
a8d8
a8c8
a8b8
f8b8
f8c8
f8d8
f8e8
g8h8
g8h7

## Board State Fen
r4rk1/1b2qpp1/pp5p/3B1p2/P7/1Q2P3/1P3PPP/R4RK1 b - - 0 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
f5f4
a6a5
b6b5
h6h5
b7d5
b7c6
b7c8
e7a3
e7b4
e7c5
e7d6
e7d8
e7h4
e7g5
e7f6
e7c7
e7d7
e7e3
e7e4
e7e5
e7e6
e7e8
g7g5
g7g6
a8a7
a8e8
a8d8
a8c8
a8b8
f8b8
f8c8
f8d8
f8e8
g8h8
g8h7

## Board State Fen
r4rk1/1b2qpp1/pp5p/3B1p2/P7/1Q2P3/1P3PPP/R4RK1 b - - 0 19
assistant
b7d5