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
a6b5
a6c8
a6b7
c4b3
b6a4
b6a8
b6c8
b6d5
b6d7
e6e5
e7c5
e7d6
e7h4
e7g5
e7f6
f7f5
f7f6
g7g5
g7g6
h7h5
h7h6
b8a8
b8b7
b8c8
d8c7
d8c8
d8d4
d8d5
d8d6
d8d7
d8e8
f8e8
g8h8

## Board State Fen
1r1q1rk1/p3bppp/bnp1p3/2N5/2pP4/1PB3P1/P3QP1P/R3RBK1 b - - 5 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
a6b5
a6c8
a6b7
c4b3
b6a4
b6a8
b6c8
b6d5
b6d7
e6e5
e7c5
e7d6
e7h4
e7g5
e7f6
f7f5
f7f6
g7g5
g7g6
h7h5
h7h6
b8a8
b8b7
b8c8
d8c7
d8c8
d8d4
d8d5
d8d6
d8d7
d8e8
f8e8
g8h8

## Board State Fen
1r1q1rk1/p3bppp/bnp1p3/2N5/2pP4/1PB3P1/P3QP1P/R3RBK1 b - - 5 18
assistant
d8c8