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
g2g4
g2g3
e3e4
h3h4
b4a3
b4a5
b4e1
b4d2
b4c3
b4f8
b4e7
b4d6
b4c5
d4e5
d4e4
d4d3
f4f5
b5a5
b5h5
b5g5
b5f5
b5e5
b5d5
b5c5
b5b8
b5b7
b5b6

## Board State Fen
6k1/5pp1/4p2p/1R6/1B1K1P2/4P2P/2r3P1/3n4 w - - 1 39
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
g2g4
g2g3
e3e4
h3h4
b4a3
b4a5
b4e1
b4d2
b4c3
b4f8
b4e7
b4d6
b4c5
d4e5
d4e4
d4d3
f4f5
b5a5
b5h5
b5g5
b5f5
b5e5
b5d5
b5c5
b5b8
b5b7
b5b6

## Board State Fen
6k1/5pp1/4p2p/1R6/1B1K1P2/4P2P/2r3P1/3n4 w - - 1 39
assistant
b5b8