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
a4b2
a4b6
a4c3
a4c5
g5g4
e6f7
e6d7
e6d6
f6f5
a7a5
a7a6
b7b5
b7b6
c7c5
c7c6
e7a3
e7b4
e7c5
e7d6
e7f8
h7h6
a8c8
a8b8
d8b8
d8c8
d8d2
d8d3
d8d4
d8d5
d8d6
d8d7
d8h8
d8g8
d8f8
d8e8

## Board State Fen
r2r4/ppp1b2p/4kp2/4p1pP/n3P3/2P2P2/PP1BK1PN/1R1R4 b - - 6 18
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
a4b2
a4b6
a4c3
a4c5
g5g4
e6f7
e6d7
e6d6
f6f5
a7a5
a7a6
b7b5
b7b6
c7c5
c7c6
e7a3
e7b4
e7c5
e7d6
e7f8
h7h6
a8c8
a8b8
d8b8
d8c8
d8d2
d8d3
d8d4
d8d5
d8d6
d8d7
d8h8
d8g8
d8f8
d8e8

## Board State Fen
r2r4/ppp1b2p/4kp2/4p1pP/n3P3/2P2P2/PP1BK1PN/1R1R4 b - - 6 18
assistant
b7b5