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
g5c1
g5d2
g5e3
g5f4
g5d8
g5e7
g5f6
g5h4
e6d5
e6d7
e6h3
e6g4
e6f5
h6h5
f7f5
f7f6
g7g6
b8a8
b8b6
b8b7
c8a6
c8b7
c8d7
c8c3
c8c4
c8c5
c8c6
c8c7
c8e8
c8d8
f8d8
f8e8
f8g8
h8h7
h8g8

## Board State Fen
1rq2r1k/5pp1/3pb2p/pp1Np1b1/4P3/P1P3QP/1P2BPP1/3R1RK1 b - - 0 21
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
g5c1
g5d2
g5e3
g5f4
g5d8
g5e7
g5f6
g5h4
e6d5
e6d7
e6h3
e6g4
e6f5
h6h5
f7f5
f7f6
g7g6
b8a8
b8b6
b8b7
c8a6
c8b7
c8d7
c8c3
c8c4
c8c5
c8c6
c8c7
c8e8
c8d8
f8d8
f8e8
f8g8
h8h7
h8g8

## Board State Fen
1rq2r1k/5pp1/3pb2p/pp1Np1b1/4P3/P1P3QP/1P2BPP1/3R1RK1 b - - 0 21
assistant
c8d8