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
b1a1
b1h1
b1g1
b1f1
b1e1
b1d1
b1c1
b1b3
b1b2
d4a1
d4b2
d4c3
d4c5
d4g1
d4f2
d4e3
e5f4
b6b5
g7g5
g7g6
h7h5
h7h6
g8h8
g8f8
g8f7

## Board State Fen
6k1/6pp/1p6/3Rp3/3bNP2/1P5P/4K1P1/1r6 b - - 6 37
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
b1a1
b1h1
b1g1
b1f1
b1e1
b1d1
b1c1
b1b3
b1b2
d4a1
d4b2
d4c3
d4c5
d4g1
d4f2
d4e3
e5f4
b6b5
g7g5
g7g6
h7h5
h7h6
g8h8
g8f8
g8f7

## Board State Fen
6k1/6pp/1p6/3Rp3/3bNP2/1P5P/4K1P1/1r6 b - - 6 37
assistant
b1b3