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
a6a5
c6b4
c6b8
c6d4
c6d8
c6a5
c6a7
c6e5
c6e7
h6h5
b7b5
b7b6
g7g5
g7g6
a8a7
a8e8
a8d8
a8c8
a8b8
f8b8
f8c8
f8d8
f8e8
f8f4
f8f5
f8f6
f8f7
g8h8
g8h7

## Board State Fen
r4rk1/1pp3p1/p1n4p/8/P1PPpR2/4P2P/2PN2P1/R5K1 b - - 0 20
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
a6a5
c6b4
c6b8
c6d4
c6d8
c6a5
c6a7
c6e5
c6e7
h6h5
b7b5
b7b6
g7g5
g7g6
a8a7
a8e8
a8d8
a8c8
a8b8
f8b8
f8c8
f8d8
f8e8
f8f4
f8f5
f8f6
f8f7
g8h8
g8h7

## Board State Fen
r4rk1/1pp3p1/p1n4p/8/P1PPpR2/4P2P/2PN2P1/R5K1 b - - 0 20
assistant
f8f4