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
b5b4
a6a5
d6a3
d6b4
d6c5
d6g3
d6f4
d6e5
f6e4
f6e8
f6g4
f6d5
f6d7
f6h5
e7d8
e7d7
e7e3
e7e4
e7e5
e7e6
e7e8
g7g5
g7g6
h7h5
h7h6
a8a7
a8e8
a8d8
a8c8
a8b8
f8b8
f8c8
f8d8
f8e8
g8h8

## Board State Fen
r4rk1/2p1qppp/p1Qb1n2/1p6/8/1N2B1P1/PP2PP1P/R4RK1 b - - 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
b5b4
a6a5
d6a3
d6b4
d6c5
d6g3
d6f4
d6e5
f6e4
f6e8
f6g4
f6d5
f6d7
f6h5
e7d8
e7d7
e7e3
e7e4
e7e5
e7e6
e7e8
g7g5
g7g6
h7h5
h7h6
a8a7
a8e8
a8d8
a8c8
a8b8
f8b8
f8c8
f8d8
f8e8
g8h8

## Board State Fen
r4rk1/2p1qppp/p1Qb1n2/1p6/8/1N2B1P1/PP2PP1P/R4RK1 b - - 0 18
assistant
f6g4