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
c5c4
h6h5
b7b5
b7b6
d7b6
d7b8
d7f6
g7g5
g7g6
c8a8
c8b8
c8c6
c8c7
c8e8
c8d8
f8d8
f8e8
f8f3
f8f4
f8f5
f8f6
f8f7
g8h8
g8h7
g8f7

## Board State Fen
2r2rk1/1p1n2p1/p3p2p/R1p1p3/4P3/5N2/1PP2PPP/3R1K2 b - - 1 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
c5c4
h6h5
b7b5
b7b6
d7b6
d7b8
d7f6
g7g5
g7g6
c8a8
c8b8
c8c6
c8c7
c8e8
c8d8
f8d8
f8e8
f8f3
f8f4
f8f5
f8f6
f8f7
g8h8
g8h7
g8f7

## Board State Fen
2r2rk1/1p1n2p1/p3p2p/R1p1p3/4P3/5N2/1PP2PPP/3R1K2 b - - 1 21
assistant
c8c7