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
b3a1
b3a5
b3c1
b3c5
b3d2
b3d4
h3c3
h3d3
h3e3
h3f3
h3g3
h3h1
h3h2
h3h5
h3h4
b5b4
e5f4
h6h5

## Board State Fen
4k3/1R6/4N2p/1p2p3/4PP2/Pn5r/2K5/8 b - - 4 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
b3a1
b3a5
b3c1
b3c5
b3d2
b3d4
h3c3
h3d3
h3e3
h3f3
h3g3
h3h1
h3h2
h3h5
h3h4
b5b4
e5f4
h6h5

## Board State Fen
4k3/1R6/4N2p/1p2p3/4PP2/Pn5r/2K5/8 b - - 4 42
assistant
e5f4