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
b4a4
b4b1
b4b2
b4b3
b4e4
b4d4
b4c4
b4b8
b4b7
b4b6
b4b5
d6d5
f6d8
f6e7
f6h4
f6g5
g6f4
g6h4
g6h8
g6e7
c7c5
c7c6
d7a4
d7b5
d7c6
d7c8
d7h3
d7g4
d7f5
d7e6
d7e8
d7e7
d7d8
h7h5
h7h6
f8a8
f8b8
f8c8
f8d8
f8e8
g8h8

## Board State Fen
5rk1/2pq1ppp/R2p1bn1/4p3/1r2P3/3PBN2/2P2PPP/3Q1RK1 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
b4a4
b4b1
b4b2
b4b3
b4e4
b4d4
b4c4
b4b8
b4b7
b4b6
b4b5
d6d5
f6d8
f6e7
f6h4
f6g5
g6f4
g6h4
g6h8
g6e7
c7c5
c7c6
d7a4
d7b5
d7c6
d7c8
d7h3
d7g4
d7f5
d7e6
d7e8
d7e7
d7d8
h7h5
h7h6
f8a8
f8b8
f8c8
f8d8
f8e8
g8h8

## Board State Fen
5rk1/2pq1ppp/R2p1bn1/4p3/1r2P3/3PBN2/2P2PPP/3Q1RK1 b - - 0 18
assistant
f8b8