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
a2b1
a2c4
a2b3
a5a4
d5c3
d5e3
d5b4
d5b6
d5f6
f5e5
f5h5
f5g5
f5f8
f5f7
f5f6
g6g5
b7b5
b7b6
c7c5
c7c6
e7e6
g7e5
g7f6
g7f8
g7h6
g7h8
h7h5
h7h6
a8a6
a8a7
a8f8
a8e8
a8d8
a8c8
a8b8
g8h8
g8f8
g8f7

## Board State Fen
r5k1/1pp1p1bp/6p1/p2nPr2/5p1P/P2B1P1N/bP3BP1/2K1R2R b - - 3 19
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
a2b1
a2c4
a2b3
a5a4
d5c3
d5e3
d5b4
d5b6
d5f6
f5e5
f5h5
f5g5
f5f8
f5f7
f5f6
g6g5
b7b5
b7b6
c7c5
c7c6
e7e6
g7e5
g7f6
g7f8
g7h6
g7h8
h7h5
h7h6
a8a6
a8a7
a8f8
a8e8
a8d8
a8c8
a8b8
g8h8
g8f8
g8f7

## Board State Fen
r5k1/1pp1p1bp/6p1/p2nPr2/5p1P/P2B1P1N/bP3BP1/2K1R2R b - - 3 19
assistant
f5e5