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
f1a1
f1b1
f1c1
f1d1
f1e1
g1h1
f2f4
f2f3
g2g4
g2g3
h2h4
h2h3
a3b1
a3b5
a3c2
a3c4
d7a7
d7b7
d7c7
d7d1
d7d2
d7d3
d7d4
d7d5
d7d6
d7f7
d7e7
d7d8

## Board State Fen
r4rk1/3R1p1p/p7/8/4p3/N7/Pb3PPP/5RK1 w - - 0 23
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
f1a1
f1b1
f1c1
f1d1
f1e1
g1h1
f2f4
f2f3
g2g4
g2g3
h2h4
h2h3
a3b1
a3b5
a3c2
a3c4
d7a7
d7b7
d7c7
d7d1
d7d2
d7d3
d7d4
d7d5
d7d6
d7f7
d7e7
d7d8

## Board State Fen
r4rk1/3R1p1p/p7/8/4p3/N7/Pb3PPP/5RK1 w - - 0 23
assistant
a3c4