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
d5c3
d5e3
d5e7
d5b4
d5b6
d5f4
d5f6
a6a5
d6a3
d6b4
d6c5
d6e5
d6f8
d6e7
h6h5
b7c6
b7c8
c7c5
c7c6
f7f5
f7f6
g7g5
g7g6
a8a7
a8c8
a8b8
d8h4
d8g5
d8f6
d8e7
d8b8
d8c8
d8d7
e8e5
e8e6
e8e7
e8f8
g8h8
g8h7
g8f8

## Board State Fen
r2qr1k1/1bp2pp1/p2b3p/1p1nN3/3P4/7P/PP1B1PP1/2RQRBK1 b - - 1 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
b5b4
d5c3
d5e3
d5e7
d5b4
d5b6
d5f4
d5f6
a6a5
d6a3
d6b4
d6c5
d6e5
d6f8
d6e7
h6h5
b7c6
b7c8
c7c5
c7c6
f7f5
f7f6
g7g5
g7g6
a8a7
a8c8
a8b8
d8h4
d8g5
d8f6
d8e7
d8b8
d8c8
d8d7
e8e5
e8e6
e8e7
e8f8
g8h8
g8h7
g8f8

## Board State Fen
r2qr1k1/1bp2pp1/p2b3p/1p1nN3/3P4/7P/PP1B1PP1/2RQRBK1 b - - 1 19
assistant
c7c5