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
d6a3
d6b4
d6c5
d6e7
e6a2
e6b3
e6c4
e6d5
e6c8
e6d7
e6h3
e6g4
e6f5
f6e4
f6g4
f6d5
f6d7
f6h5
f6h7
g6f4
g6h4
g6h8
g6e7
h6h5
c7c5
c7c6
b8a8
b8b1
b8b2
b8b3
b8b4
b8b5
b8b6
b8b7
b8d8
b8c8
e8a4
e8b5
e8c6
e8d7
e8c8
e8d8
e8e7
g8h8
g8h7

## Board State Fen
1r2qrk1/2p2pp1/3bbnnp/4p3/B3P3/2P1BNNP/2Q2PP1/R2R2K1 b - - 9 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
d6a3
d6b4
d6c5
d6e7
e6a2
e6b3
e6c4
e6d5
e6c8
e6d7
e6h3
e6g4
e6f5
f6e4
f6g4
f6d5
f6d7
f6h5
f6h7
g6f4
g6h4
g6h8
g6e7
h6h5
c7c5
c7c6
b8a8
b8b1
b8b2
b8b3
b8b4
b8b5
b8b6
b8b7
b8d8
b8c8
e8a4
e8b5
e8c6
e8d7
e8c8
e8d8
e8e7
g8h8
g8h7

## Board State Fen
1r2qrk1/2p2pp1/3bbnnp/4p3/B3P3/2P1BNNP/2Q2PP1/R2R2K1 b - - 9 21
assistant
e8c8