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
g4h5
g4h4
g4g5
g4f4
f5f4

## Board State Fen
R7/8/8/5p2/6k1/1r6/6K1/8 b - - 4 69
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
g4h5
g4h4
g4g5
g4f4
f5f4

## Board State Fen
R7/8/8/5p2/6k1/1r6/6K1/8 b - - 4 69
assistant
f5f4