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
a7a5
a7a6
g5g4
h6h5
c6c5
f7f5
f7f6
b8a8
b8b4
b8b5
b8b6
b8b7
b8d8
b8c8
e8c8
e8d8
e8e1
e8e2
e8e3
e8e4
e8e5
e8e6
e8e7
f8b4
f8c5
f8d6
f8e7
f8g7
g8h8
g8h7
g8g7

## Board State Fen
1r2rbk1/p4p2/2p4p/6p1/NP6/P2R2P1/5PP1/2R3K1 b - - 0 22
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
a7a5
a7a6
g5g4
h6h5
c6c5
f7f5
f7f6
b8a8
b8b4
b8b5
b8b6
b8b7
b8d8
b8c8
e8c8
e8d8
e8e1
e8e2
e8e3
e8e4
e8e5
e8e6
e8e7
f8b4
f8c5
f8d6
f8e7
f8g7
g8h8
g8h7
g8g7

## Board State Fen
1r2rbk1/p4p2/2p4p/6p1/NP6/P2R2P1/5PP1/2R3K1 b - - 0 22
assistant
a7a5