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
f6f5
g6g5
h6h5
b7b5
b7b6
c7d8
c7c8
c7b8
d7a4
d7b5
d7c6
d7c8
d7h3
d7g4
d7f5
d7e6
d7e8

## Board State Fen
8/1pkb4/p2p1ppp/P2p4/3N1P1P/2K3P1/1PP5/8 b - - 1 39
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
f6f5
g6g5
h6h5
b7b5
b7b6
c7d8
c7c8
c7b8
d7a4
d7b5
d7c6
d7c8
d7h3
d7g4
d7f5
d7e6
d7e8

## Board State Fen
8/1pkb4/p2p1ppp/P2p4/3N1P1P/2K3P1/1PP5/8 b - - 1 39
assistant
b7b6