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
c7a5
c7b6
c7b8
c7g3
c7f4
c7e5
c7d6
c7d8
g8h8
g8g7
g8f8
c8b8
c8f8
c8e8
c8d8
g6e4
g6f5
g6h5
a8b8
b7b5
b7b6
e6e5
h7h5
h7h6
a7a5
a7a6
f6f5

## Board State Fen
r1r3k1/ppbR1p1p/4ppb1/8/4P3/NP4P1/P4PBP/R5K1 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
c7a5
c7b6
c7b8
c7g3
c7f4
c7e5
c7d6
c7d8
g8h8
g8g7
g8f8
c8b8
c8f8
c8e8
c8d8
g6e4
g6f5
g6h5
a8b8
b7b5
b7b6
e6e5
h7h5
h7h6
a7a5
a7a6
f6f5

## Board State Fen
r1r3k1/ppbR1p1p/4ppb1/8/4P3/NP4P1/P4PBP/R5K1 b - - 0 21
assistant
a7a5