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
b4a3
b4a5
b4e1
b4d2
b4c3
b4f8
b4e7
b4d6
b4c5
f5g6
f5g5
f5g4
f5f6
f5f4
f5e6

## Board State Fen
8/8/8/5K2/1Bpk4/8/8/8 w - - 7 67
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
b4a3
b4a5
b4e1
b4d2
b4c3
b4f8
b4e7
b4d6
b4c5
f5g6
f5g5
f5g4
f5f6
f5f4
f5e6

## Board State Fen
8/8/8/5K2/1Bpk4/8/8/8 w - - 7 67
assistant
f5f4