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
a6a5
c6c5
g6g5
a7e7
a7d7
a7c7
a7b7
a7a8
f7f5
f7f6
h7h5
h7h6
b8d7
e8e7
e8d8
e8d7
g8f8
g8g7
g8h8

## Board State Fen
1n2k1r1/r4pBp/p1p3p1/1p6/1P2B3/4P3/1P2KP1P/R6R b - - 0 20
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
a6a5
c6c5
g6g5
a7e7
a7d7
a7c7
a7b7
a7a8
f7f5
f7f6
h7h5
h7h6
b8d7
e8e7
e8d8
e8d7
g8f8
g8g7
g8h8

## Board State Fen
1n2k1r1/r4pBp/p1p3p1/1p6/1P2B3/4P3/1P2KP1P/R6R b - - 0 20
assistant
g8g7