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
a1h1
a1g1
a1f1
a1e1
a1d1
a1c1
a1b1
a1a3
a1a2
h2h4
h2h3
a4a5
g4h5
g4h4
g4h3
g4f5
g4f4
g4f3

## Board State Fen
8/p2k2pp/1p3p2/1P1p4/P2Pn1K1/4P1N1/6rP/R7 w - - 0 39
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
a1h1
a1g1
a1f1
a1e1
a1d1
a1c1
a1b1
a1a3
a1a2
h2h4
h2h3
a4a5
g4h5
g4h4
g4h3
g4f5
g4f4
g4f3

## Board State Fen
8/p2k2pp/1p3p2/1P1p4/P2Pn1K1/4P1N1/6rP/R7 w - - 0 39
assistant
a4a5