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
e5e4
f5f4
e6c8
e6d7
e6f7
e7a7
e7b7
e7c7
e7d7
e7f7
e7e8
g7f6
g7h6
g7h8
h7h5
h7h6
d8a5
d8b6
d8c7
d8a8
d8b8
d8c8
d8d6
d8d7
d8e8
f8e8
f8f6
f8f7
g8h8
g8f7

## Board State Fen
3q1rk1/4r1bp/R3b3/1B1ppp2/8/2P1N3/1P3PPP/3Q1RK1 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
e5e4
f5f4
e6c8
e6d7
e6f7
e7a7
e7b7
e7c7
e7d7
e7f7
e7e8
g7f6
g7h6
g7h8
h7h5
h7h6
d8a5
d8b6
d8c7
d8a8
d8b8
d8c8
d8d6
d8d7
d8e8
f8e8
f8f6
f8f7
g8h8
g8f7

## Board State Fen
3q1rk1/4r1bp/R3b3/1B1ppp2/8/2P1N3/1P3PPP/3Q1RK1 b - - 1 21
assistant
f5f4