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
a3a1
a3a2
a3d3
a3c3
a3b3
a3a5
a3a4
e7f8
e7f7
e7e8
e7d8
e7d7
f6e5
f6f5
c8b7
c8d7
a6a5

## Board State Fen
1Rb5/4k3/p3pp1p/4P2P/4K1P1/r2B4/8/8 b - - 1 42
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
a3a1
a3a2
a3d3
a3c3
a3b3
a3a5
a3a4
e7f8
e7f7
e7e8
e7d8
e7d7
f6e5
f6f5
c8b7
c8d7
a6a5

## Board State Fen
1Rb5/4k3/p3pp1p/4P2P/4K1P1/r2B4/8/8 b - - 1 42
assistant
c8d7