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
f2g3
f2g2
f2g1
f2f1
f2e3
f2e2
f2e1
h2h4
h2h3
f3f4
b5a5
b5b3
b5b4
b5h5
b5g5
b5f5
b5e5
b5d5
b5c5
b5b8
b5b7
b5b6

## Board State Fen
8/3k1ppp/8/1R6/r7/5P2/1P3K1P/8 w - - 1 36
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
f2g3
f2g2
f2g1
f2f1
f2e3
f2e2
f2e1
h2h4
h2h3
f3f4
b5a5
b5b3
b5b4
b5h5
b5g5
b5f5
b5e5
b5d5
b5c5
b5b8
b5b7
b5b6

## Board State Fen
8/3k1ppp/8/1R6/r7/5P2/1P3K1P/8 w - - 1 36
assistant
b5b7