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
d4a4
d4b4
d4c4
d4d1
d4d2
d4d3
d4f4
d4e4
d4d6
d4d5
h7e7
h7f7
h7g7
h7h6
h7h8
d7e8
d7e7
d7d8
d7c8
d7c7
c6c5

## Board State Fen
8/3k3r/2p3RP/8/3r1N2/5KP1/8/8 b - - 12 53
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
d4a4
d4b4
d4c4
d4d1
d4d2
d4d3
d4f4
d4e4
d4d6
d4d5
h7e7
h7f7
h7g7
h7h6
h7h8
d7e8
d7e7
d7d8
d7c8
d7c7
c6c5

## Board State Fen
8/3k3r/2p3RP/8/3r1N2/5KP1/8/8 b - - 12 53
assistant
d4b4