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
a6a5
c7a5
c7b6
c7b8
c7d6
c7d7
c7c8
c6b4
c6b8
c6d4
c6a5
c6a7
e5e4
e7a3
e7b4
e7c5
e7d6
e7g5
e7f6
e7f8
f7f5
f7f6
h7h5
h7h6
a8a7
a8c8
a8b8
d8b8
d8c8
d8d5
d8d6
d8d7
d8f8
d8e8
g8h8
g8g7
g8f8

## Board State Fen
r2r2k1/1pq1bp1p/p1n3p1/3Rp1N1/2P4P/P2QP1B1/1P3PP1/1K5R 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
a6a5
c7a5
c7b6
c7b8
c7d6
c7d7
c7c8
c6b4
c6b8
c6d4
c6a5
c6a7
e5e4
e7a3
e7b4
e7c5
e7d6
e7g5
e7f6
e7f8
f7f5
f7f6
h7h5
h7h6
a8a7
a8c8
a8b8
d8b8
d8c8
d8d5
d8d6
d8d7
d8f8
d8e8
g8h8
g8g7
g8f8

## Board State Fen
r2r2k1/1pq1bp1p/p1n3p1/3Rp1N1/2P4P/P2QP1B1/1P3PP1/1K5R b - - 2 18
assistant
a8b8