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
a5b4
a5a4
b6c7
b6b7
b6a7
b6a6
h6h5
c8a6
c8b7
c8e6
c8d7

## Board State Fen
2b5/8/1k1p3p/p2p1p2/1P1N1P1P/1KP5/8/8 b - - 4 74
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
a5b4
a5a4
b6c7
b6b7
b6a7
b6a6
h6h5
c8a6
c8b7
c8e6
c8d7

## Board State Fen
2b5/8/1k1p3p/p2p1p2/1P1N1P1P/1KP5/8/8 b - - 4 74
assistant
a5b4