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
a1f6
a1e5
a1d4
a1c3
a1b2
b6b5
d6c4
d6c8
d6e4
d6b5
d6b7
d6f7
h6g5
d7e7
d7d8
d7c8
d7c7
g7g6
e8a8
e8b8
e8c8
e8d8
e8e3
e8e4
e8e5
e8e6
e8e7
e8h8
e8g8
e8f8

## Board State Fen
4r3/3k2p1/1p1n3p/p1pP1pPP/P1P2P2/3BBK2/4R3/b7 b - - 15 51
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
a1f6
a1e5
a1d4
a1c3
a1b2
b6b5
d6c4
d6c8
d6e4
d6b5
d6b7
d6f7
h6g5
d7e7
d7d8
d7c8
d7c7
g7g6
e8a8
e8b8
e8c8
e8d8
e8e3
e8e4
e8e5
e8e6
e8e7
e8h8
e8g8
e8f8

## Board State Fen
4r3/3k2p1/1p1n3p/p1pP1pPP/P1P2P2/3BBK2/4R3/b7 b - - 15 51
assistant
a1d4