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
a7e3
a7d4
a7c5
a7b6
a7b8
b7b1
b7b2
b7b3
b7b4
b7b5
b7b6
b7e7
b7d7
b7c7
b7b8
g3g4
h2h4
h2h3
f2f4
f2f3
a2a4
a2a3
g1h1
g1g2
g1f1

## Board State Fen
r7/BR2bp1p/4k1p1/8/2p5/2P3P1/P4P1P/6K1 w - - 2 31
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
a7e3
a7d4
a7c5
a7b6
a7b8
b7b1
b7b2
b7b3
b7b4
b7b5
b7b6
b7e7
b7d7
b7c7
b7b8
g3g4
h2h4
h2h3
f2f4
f2f3
a2a4
a2a3
g1h1
g1g2
g1f1

## Board State Fen
r7/BR2bp1p/4k1p1/8/2p5/2P3P1/P4P1P/6K1 w - - 2 31
assistant
a7d4