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
a7a5
a7a6
b7b5
b7b6
c7c5
c7c6
d7a4
d7b5
d7c6
d7c8
d7h3
d7g4
d7f5
d7e6
f7f5
f7f6
g7g5
g7g6
h7h5
h7h6
a8d8
a8c8
a8b8
e8b8
e8c8
e8d8
e8e3
e8e4
e8e5
e8e6
e8e7
f8a3
f8b4
f8c5
f8d6
f8e7
g8h8

## Board State Fen
r3rbk1/pppb1ppp/8/8/Q6P/P1B1PB2/1P3P2/3RK2R b K - 0 18
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
a7a5
a7a6
b7b5
b7b6
c7c5
c7c6
d7a4
d7b5
d7c6
d7c8
d7h3
d7g4
d7f5
d7e6
f7f5
f7f6
g7g5
g7g6
h7h5
h7h6
a8d8
a8c8
a8b8
e8b8
e8c8
e8d8
e8e3
e8e4
e8e5
e8e6
e8e7
f8a3
f8b4
f8c5
f8d6
f8e7
g8h8

## Board State Fen
r3rbk1/pppb1ppp/8/8/Q6P/P1B1PB2/1P3P2/3RK2R b K - 0 18
assistant
d7a4