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
d4a4
d4b4
d4c4
d4d1
d4d2
d4d3
d4h4
d4g4
d4f4
d4e4
d4d8
d4d7
d4d6
d4d5
f6e4
f6e8
f6g4
f6d5
f6d7
f6h5
c6c5
e6a2
e6b3
e6c4
e6d5
e6c8
e6d7
e6f5
e5e4
a7a5
a7a6
b7b5
b7b6
g7f8
g7h6
g7h8
h7h5
h7h6
a8f8
a8e8
a8d8
a8c8
a8b8
g8h8
g8f8

## Board State Fen
r5k1/pp3pbp/2p1bn2/4pPB1/3r4/2N4P/PPP1B1P1/3R1RK1 b - - 0 15
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
d4a4
d4b4
d4c4
d4d1
d4d2
d4d3
d4h4
d4g4
d4f4
d4e4
d4d8
d4d7
d4d6
d4d5
f6e4
f6e8
f6g4
f6d5
f6d7
f6h5
c6c5
e6a2
e6b3
e6c4
e6d5
e6c8
e6d7
e6f5
e5e4
a7a5
a7a6
b7b5
b7b6
g7f8
g7h6
g7h8
h7h5
h7h6
a8f8
a8e8
a8d8
a8c8
a8b8
g8h8
g8f8

## Board State Fen
r5k1/pp3pbp/2p1bn2/4pPB1/3r4/2N4P/PPP1B1P1/3R1RK1 b - - 0 15
assistant
e6c4