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
g5g4
e6e5
a7a5
a7a6
b7a6
b7a8
b7g2
b7f3
b7e4
b7d5
b7c6
b7c8
c7c5
c7c6
f7f5
f7f6
g7g6
b8a8
b8c8
d8c8
d8d4
d8d5
d8d6
d8d7
d8f8
d8e8
g8h8
g8h7
g8f8

## Board State Fen
1r1r2k1/pbp2pp1/4p3/6p1/3P4/1PN4P/P4PP1/3RR1K1 b - - 0 21
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
g5g4
e6e5
a7a5
a7a6
b7a6
b7a8
b7g2
b7f3
b7e4
b7d5
b7c6
b7c8
c7c5
c7c6
f7f5
f7f6
g7g6
b8a8
b8c8
d8c8
d8d4
d8d5
d8d6
d8d7
d8f8
d8e8
g8h8
g8h7
g8f8

## Board State Fen
1r1r2k1/pbp2pp1/4p3/6p1/3P4/1PN4P/P4PP1/3RR1K1 b - - 0 21
assistant
d8d6