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
a5a4
h5h4
c6a6
c6b6
c6c1
c6c2
c6c3
c6c4
c6c5
c6c8
c6c7
f6f5
g6h7
g6h6
g6g7
g6g5
g6f7
b7c5
b7d8

## Board State Fen
8/Nn6/2rp1pk1/p2Rp2p/4P3/PP3PP1/3K4/8 b - - 1 40
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
a5a4
h5h4
c6a6
c6b6
c6c1
c6c2
c6c3
c6c4
c6c5
c6c8
c6c7
f6f5
g6h7
g6h6
g6g7
g6g5
g6f7
b7c5
b7d8

## Board State Fen
8/Nn6/2rp1pk1/p2Rp2p/4P3/PP3PP1/3K4/8 b - - 1 40
assistant
c6b6