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
b2b4
b2b3
e2f3
e2f2
e2f1
e2e1
e2d3
e2d2
e2d1
e4e5
h4f4
h4g4
h4h1
h4h2
h4h3
h4h8
h4h7
h4h6
h4h5

## Board State Fen
8/8/p3r1p1/1pk5/4P2R/4P3/1P2K3/8 w - - 0 38
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
b2b4
b2b3
e2f3
e2f2
e2f1
e2e1
e2d3
e2d2
e2d1
e4e5
h4f4
h4g4
h4h1
h4h2
h4h3
h4h8
h4h7
h4h6
h4h5

## Board State Fen
8/8/p3r1p1/1pk5/4P2R/4P3/1P2K3/8 w - - 0 38
assistant
e2d3