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
d4c4
d4d1
d4d2
d4d3
d4h4
d4g4
d4f4
d4e4
d4d8
d4d7
d4d6
d4d5
e5e4
f5g6
f5g5

## Board State Fen
8/8/1R3p2/4pk2/1p1r4/1P3K2/P4P2/8 b - - 5 42
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
d4c4
d4d1
d4d2
d4d3
d4h4
d4g4
d4f4
d4e4
d4d8
d4d7
d4d6
d4d5
e5e4
f5g6
f5g5

## Board State Fen
8/8/1R3p2/4pk2/1p1r4/1P3K2/P4P2/8 b - - 5 42
assistant
d4d2