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
a4a3
d7c5
d7e5
d7b6
d7b8
d7f6
d7f8
g7g5
g7g6
h7h8
h7g8
d8a8
d8b8
d8c8
d8h8
d8g8
d8f8
d8e8

## Board State Fen
3r4/3n2pk/3R3p/4Np1P/p4P2/4p3/4K3/8 b - - 1 49
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
a4a3
d7c5
d7e5
d7b6
d7b8
d7f6
d7f8
g7g5
g7g6
h7h8
h7g8
d8a8
d8b8
d8c8
d8h8
d8g8
d8f8
d8e8

## Board State Fen
3r4/3n2pk/3R3p/4Np1P/p4P2/4p3/4K3/8 b - - 1 49
assistant
a4a3