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
d1a1
d1b1
d1c1
d1h1
d1g1
d1f1
d1e1
d1d8
d1d7
d1d6
d1d5
d1d4
d1d3
d1d2
b6a4
b6a8
b6c4
b6c8
b6d5
b6d7
g6g5
f7f5
f7f6
g8h8
g8h7
g8f8

## Board State Fen
6k1/5pp1/RnN3p1/8/8/7P/5PPK/3r4 b - - 4 37
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
d1a1
d1b1
d1c1
d1h1
d1g1
d1f1
d1e1
d1d8
d1d7
d1d6
d1d5
d1d4
d1d3
d1d2
b6a4
b6a8
b6c4
b6c8
b6d5
b6d7
g6g5
f7f5
f7f6
g8h8
g8h7
g8f8

## Board State Fen
6k1/5pp1/RnN3p1/8/8/7P/5PPK/3r4 b - - 4 37
assistant
b6c4