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
b5b4
a6a5
h6h5
d7c5
d7e5
d7b6
d7b8
d7f6
e7a3
e7b4
e7c5
e7d6
e7d8
e7h4
e7g5
e7f6
f7f5
f7f6
g7g5
g7g6
h7g5
h7f6
c8b7
e8d8
f8g8
h8g8

## Board State Fen
1Nb1qr1k/3nbppn/p3p2p/1p2P3/4Q2P/1BN5/PPP2BP1/R4RK1 b - - 0 21
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
b5b4
a6a5
h6h5
d7c5
d7e5
d7b6
d7b8
d7f6
e7a3
e7b4
e7c5
e7d6
e7d8
e7h4
e7g5
e7f6
f7f5
f7f6
g7g5
g7g6
h7g5
h7f6
c8b7
e8d8
f8g8
h8g8

## Board State Fen
1Nb1qr1k/3nbppn/p3p2p/1p2P3/4Q2P/1BN5/PPP2BP1/R4RK1 b - - 0 21
assistant
d7b8