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
d4d5
d4d3
d4c5
d4c4
d4c3
e4f4
e4e8
e4e7
e4e6
e4e5

## Board State Fen
8/8/5k2/6p1/3KR1P1/4P1r1/8/8 w - - 23 100
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
d4d5
d4d3
d4c5
d4c4
d4c3
e4f4
e4e8
e4e7
e4e6
e4e5

## Board State Fen
8/8/5k2/6p1/3KR1P1/4P1r1/8/8 w - - 23 100
assistant
d4d5