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
b4a2
b4a6
b4c2
b4d3
b4d5
f5b1
f5c2
f5d3
f5e4
f5c8
f5d7
f5e6
f5h3
f5g4
f5g6
b7b5
b7b6
c7b6
c7b8
c7e5
c7d6
c7d8
c7e7
c7d7
c7c8
g7g5
g7g6
h7h5
h7h6
a8a6
a8a7
a8e8
a8d8
a8c8
a8b8
f8b8
f8c8
f8d8
f8e8
g8h8

## Board State Fen
r4rk1/1pq2ppp/2p5/p1P1Nb2/PnB5/5Q2/1P3PPP/R3R1K1 b - - 1 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
b4a2
b4a6
b4c2
b4d3
b4d5
f5b1
f5c2
f5d3
f5e4
f5c8
f5d7
f5e6
f5h3
f5g4
f5g6
b7b5
b7b6
c7b6
c7b8
c7e5
c7d6
c7d8
c7e7
c7d7
c7c8
g7g5
g7g6
h7h5
h7h6
a8a6
a8a7
a8e8
a8d8
a8c8
a8b8
f8b8
f8c8
f8d8
f8e8
g8h8

## Board State Fen
r4rk1/1pq2ppp/2p5/p1P1Nb2/PnB5/5Q2/1P3PPP/R3R1K1 b - - 1 20
assistant
f5e6