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
b3a3
b3b1
b3b2
b3h3
b3g3
b3f3
b3e3
b3d3
b3c3
b3b8
b3b7
b3b6
b3b5
b3b4
g6g5
a7a5
a7a6
f7f5
f7f6
g7h6
g7f6
h7h5
h7h6

## Board State Fen
4R3/p4pkp/3P2p1/8/8/1r6/6PP/6K1 b - - 0 31
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
b3a3
b3b1
b3b2
b3h3
b3g3
b3f3
b3e3
b3d3
b3c3
b3b8
b3b7
b3b6
b3b5
b3b4
g6g5
a7a5
a7a6
f7f5
f7f6
g7h6
g7f6
h7h5
h7h6

## Board State Fen
4R3/p4pkp/3P2p1/8/8/1r6/6PP/6K1 b - - 0 31
assistant
b3d3