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
a5a4
b5b4
a6b4
a6b8
a6c5
a6c7
c6c5
d6c4
d6e4
d6b7
d6f5
f6d4
f6e5
f6d8
f6e7
f6h4
f6g5
f6e6
f6f4
f6f5
f6g6
h6h5
g7g5
g7g6
a8a7
a8b8
c8b7
c8h3
c8g4
c8f5
c8e6
c8d7
e8d8
e8e3
e8e4
e8e5
e8e6
e8e7
f8e7
g8h8

## Board State Fen
r1b1rbk1/5pp1/n1pn1q1p/pp1p4/3P1N2/P1NBPP2/1PQ2BPP/4RRK1 b - - 1 17
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
a5a4
b5b4
a6b4
a6b8
a6c5
a6c7
c6c5
d6c4
d6e4
d6b7
d6f5
f6d4
f6e5
f6d8
f6e7
f6h4
f6g5
f6e6
f6f4
f6f5
f6g6
h6h5
g7g5
g7g6
a8a7
a8b8
c8b7
c8h3
c8g4
c8f5
c8e6
c8d7
e8d8
e8e3
e8e4
e8e5
e8e6
e8e7
f8e7
g8h8

## Board State Fen
r1b1rbk1/5pp1/n1pn1q1p/pp1p4/3P1N2/P1NBPP2/1PQ2BPP/4RRK1 b - - 1 17
assistant
d6c4