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
b2a2
b2b1
b2h2
b2g2
b2f2
b2e2
b2d2
b2c2
b2b4
b2b3
f5f4
g5g4
a6b5
a6a7
e6d4
e6d8
e6f4
e6f8
e6c5
e6c7
e6g7
b7b5
b7b6

## Board State Fen
8/1p6/k1p1n3/N1P1Ppp1/1PR5/4P1P1/1r6/5K2 b - - 1 43
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
b2a2
b2b1
b2h2
b2g2
b2f2
b2e2
b2d2
b2c2
b2b4
b2b3
f5f4
g5g4
a6b5
a6a7
e6d4
e6d8
e6f4
e6f8
e6c5
e6c7
e6g7
b7b5
b7b6

## Board State Fen
8/1p6/k1p1n3/N1P1Ppp1/1PR5/4P1P1/1r6/5K2 b - - 1 43
assistant
a6b5