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
b7b5
b7b6
c6b4
c6b8
c6d4
c6a5
c6e7
a7a5
a7a6
e5f4
e5e4
f7f5
f7f6
g7g5
g7g6
h7h5
h7h6
a8b8
c8h3
c8g4
c8f5
c8e6
c8d7
d8e7
d8d7
d8c7
e8e6
e8e7
e8h8
e8g8
e8f8

## Board State Fen
r1bkr3/pp3ppp/2n5/4p3/2P2P2/P1P1B3/5KPP/1R3B1R b - - 2 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
b7b5
b7b6
c6b4
c6b8
c6d4
c6a5
c6e7
a7a5
a7a6
e5f4
e5e4
f7f5
f7f6
g7g5
g7g6
h7h5
h7h6
a8b8
c8h3
c8g4
c8f5
c8e6
c8d7
d8e7
d8d7
d8c7
e8e6
e8e7
e8h8
e8g8
e8f8

## Board State Fen
r1bkr3/pp3ppp/2n5/4p3/2P2P2/P1P1B3/5KPP/1R3B1R b - - 2 18
assistant
d8c7