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
d6a6
d6b6
d6c6
d6d1
d6d2
d6d3
d6d4
d6d5
d6e6
d6d8
d6d7
f6f7
f6e7
f6e6
f6e5

## Board State Fen
8/7k/3R1Kp1/6P1/r7/8/8/8 w - - 8 78
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
d6a6
d6b6
d6c6
d6d1
d6d2
d6d3
d6d4
d6d5
d6e6
d6d8
d6d7
f6f7
f6e7
f6e6
f6e5

## Board State Fen
8/7k/3R1Kp1/6P1/r7/8/8/8 w - - 8 78
assistant
d6d7