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
d5d4
f6a6
f6b6
f6c6
f6d6
f6e6
f6f3
f6f4
f6f5
f6f8
f6f7
g6f4
g6f8
g6h4
g6h8
g6e5
a7a5
a7a6
b7b5
b7b6
e7f5
e7c6
h7h5
h7h6
c8a8
c8b8
c8c3
c8c4
c8c5
c8c6
c8c7
c8d8
e8a4
e8b5
e8c6
e8d7
e8f7
g8h8
g8f8
g8f7

## Board State Fen
2r1b1k1/pp2n1pp/5rn1/3p4/1P6/P1NB1N2/1BP2PPP/R5K1 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
d5d4
f6a6
f6b6
f6c6
f6d6
f6e6
f6f3
f6f4
f6f5
f6f8
f6f7
g6f4
g6f8
g6h4
g6h8
g6e5
a7a5
a7a6
b7b5
b7b6
e7f5
e7c6
h7h5
h7h6
c8a8
c8b8
c8c3
c8c4
c8c5
c8c6
c8c7
c8d8
e8a4
e8b5
e8c6
e8d7
e8f7
g8h8
g8f8
g8f7

## Board State Fen
2r1b1k1/pp2n1pp/5rn1/3p4/1P6/P1NB1N2/1BP2PPP/R5K1 b - - 1 21
assistant
g6f4