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
b3b4
h3h4
c4c5
b6c7
b6c5
b6b7
b6a7

## Board State Fen
8/1p4k1/pK6/P4p2/2P2P2/1P5P/6n1/8 w - - 2 51
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
b3b4
h3h4
c4c5
b6c7
b6c5
b6b7
b6a7

## Board State Fen
8/1p4k1/pK6/P4p2/2P2P2/1P5P/6n1/8 w - - 2 51
assistant
b6b7