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
b4c6
b4d3
b4d5
d4c4
d4d1
d4d2
d4d3
d4h4
d4g4
d4f4
d4e4
d4d8
d4d7
d4d6
d4d5
e6e5
h6h5
f7f5
f7f6
g7g5
g7g6
f8g8
f8e8

## Board State Fen
5k2/2R2pp1/4p2p/1P6/1n1r4/6P1/1P3PB1/1K6 b - - 6 38
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
b4c6
b4d3
b4d5
d4c4
d4d1
d4d2
d4d3
d4h4
d4g4
d4f4
d4e4
d4d8
d4d7
d4d6
d4d5
e6e5
h6h5
f7f5
f7f6
g7g5
g7g6
f8g8
f8e8

## Board State Fen
5k2/2R2pp1/4p2p/1P6/1n1r4/6P1/1P3PB1/1K6 b - - 6 38
assistant
d4d1