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
f1a1
f1b1
f1c1
f1d1
f1e1
f1h1
f1g1
f1f5
f1f4
f1f3
f1f2
b4b3
h4h3
g5c1
g5d2
g5e3
g5f4
g5h6
h5h6
h5g4

## Board State Fen
8/1R6/3B1p2/P4Pbk/1p2K2p/8/6P1/5r2 b - - 0 47
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
f1a1
f1b1
f1c1
f1d1
f1e1
f1h1
f1g1
f1f5
f1f4
f1f3
f1f2
b4b3
h4h3
g5c1
g5d2
g5e3
g5f4
g5h6
h5h6
h5g4

## Board State Fen
8/1R6/3B1p2/P4Pbk/1p2K2p/8/6P1/5r2 b - - 0 47
assistant
f1a1