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
a5a4
f5f4
b6b5
g6f7
d7a7
d7b7
d7c7
d7d1
d7d2
d7d3
d7d4
d7d5
d7d6
d7f7
d7e7
d7d8

## Board State Fen
7R/3r2p1/1p4k1/p4pP1/1p5P/1P2K3/1P3P2/8 b - - 8 50
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
a5a4
f5f4
b6b5
g6f7
d7a7
d7b7
d7c7
d7d1
d7d2
d7d3
d7d4
d7d5
d7d6
d7f7
d7e7
d7d8

## Board State Fen
7R/3r2p1/1p4k1/p4pP1/1p5P/1P2K3/1P3P2/8 b - - 8 50
assistant
d7d1