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
f2g2
f2g1
f2f1
f2e3
f2e2
f2e1
a3a4
c3c4
f3f4
g3g4
h4a4
h4b4
h4c4
h4d4
h4e4
h4f4
h4g4
h4h1
h4h2
h4h3
h4h6
h4h5

## Board State Fen
3r4/1p4k1/2p4p/1p1p4/7R/P1P2PP1/1P3K2/8 w - - 1 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
f2g2
f2g1
f2f1
f2e3
f2e2
f2e1
a3a4
c3c4
f3f4
g3g4
h4a4
h4b4
h4c4
h4d4
h4e4
h4f4
h4g4
h4h1
h4h2
h4h3
h4h6
h4h5

## Board State Fen
3r4/1p4k1/2p4p/1p1p4/7R/P1P2PP1/1P3K2/8 w - - 1 38
assistant
f2e3