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
a6a5
c5b3
c5d3
c5d7
c5a4
c5e4
c5e6
b7b5
b7b6
a7b6
a7b8
d5d4
e7f5
e7c6
e7c8
e7g6
f7f5
f7f6
g7g5
g7g6
h7h5
h7h6
a8d8
a8c8
a8b8
e8b8
e8c8
e8d8
e8f8
g8h8
g8f8

## Board State Fen
r3r1k1/bp2nppp/p7/2np4/5B2/N1P2P2/PPB2P1P/3RR1K1 b - - 1 18
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
a6a5
c5b3
c5d3
c5d7
c5a4
c5e4
c5e6
b7b5
b7b6
a7b6
a7b8
d5d4
e7f5
e7c6
e7c8
e7g6
f7f5
f7f6
g7g5
g7g6
h7h5
h7h6
a8d8
a8c8
a8b8
e8b8
e8c8
e8d8
e8f8
g8h8
g8f8

## Board State Fen
r3r1k1/bp2nppp/p7/2np4/5B2/N1P2P2/PPB2P1P/3RR1K1 b - - 1 18
assistant
c5e6