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
e1a1
e1b1
e1c1
e1d1
e1f1
e1e2
g1h1
g1f1
b2a2
b2b1
b2e2
b2d2
b2c2
b2b3
f2f4
f2f3
g2g4
g2g3
h2h4
h2h3
a3a4
e3e4
b4a5
b4c5
b4b5

## Board State Fen
1r1r2k1/5p1p/6p1/p1p5/1P6/P3P3/1R3PPP/4R1K1 w - a6 0 28
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
e1a1
e1b1
e1c1
e1d1
e1f1
e1e2
g1h1
g1f1
b2a2
b2b1
b2e2
b2d2
b2c2
b2b3
f2f4
f2f3
g2g4
g2g3
h2h4
h2h3
a3a4
e3e4
b4a5
b4c5
b4b5

## Board State Fen
1r1r2k1/5p1p/6p1/p1p5/1P6/P3P3/1R3PPP/4R1K1 w - a6 0 28
assistant
b4b5