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
b1a1
b1h1
b1g1
b1f1
b1e1
b1d1
b1c1
b1b5
b1b4
b1b3
b1b2
f6f5
g6h7
g6h6
g6g7
g6f7

## Board State Fen
1R6/8/5pk1/1P6/5KP1/8/8/1r6 b - - 2 73
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
b1a1
b1h1
b1g1
b1f1
b1e1
b1d1
b1c1
b1b5
b1b4
b1b3
b1b2
f6f5
g6h7
g6h6
g6g7
g6f7

## Board State Fen
1R6/8/5pk1/1P6/5KP1/8/8/1r6 b - - 2 73
assistant
b1b4