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
b6b5
c6b4
c6b8
c6d4
c6d8
c6a5
c6e5
c6e7
h6h5
a7a5
a7a6
b7a6
b7a8
f7f5
f7f6
g7g5
g7g6
c8a8
c8b8
c8c7
c8e8
c8d8
f8g8
f8e8
f8e7

## Board State Fen
2r2k2/pb3pp1/1pnR3p/2p5/2P5/P1P1PN2/4BPPP/6K1 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
b6b5
c6b4
c6b8
c6d4
c6d8
c6a5
c6e5
c6e7
h6h5
a7a5
a7a6
b7a6
b7a8
f7f5
f7f6
g7g5
g7g6
c8a8
c8b8
c8c7
c8e8
c8d8
f8g8
f8e8
f8e7

## Board State Fen
2r2k2/pb3pp1/1pnR3p/2p5/2P5/P1P1PN2/4BPPP/6K1 b - - 0 19
assistant
f8e7