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
a5a4
b6a6
b6b3
b6b4
b6b5
b6b8
b6b7
c6a4
c6b5
c6b7
c6f3
c6e4
c6d5
c6e8
c6d7
h6h5
g7g5
g7g6
h7h8
h7g6
a8a6
a8a7
a8h8
a8g8
a8f8
a8e8
a8d8
a8c8
a8b8

## Board State Fen
r7/6pk/1rb4p/p7/8/RBP2P2/6PP/R5K1 b - - 6 23
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
a5a4
b6a6
b6b3
b6b4
b6b5
b6b8
b6b7
c6a4
c6b5
c6b7
c6f3
c6e4
c6d5
c6e8
c6d7
h6h5
g7g5
g7g6
h7h8
h7g6
a8a6
a8a7
a8h8
a8g8
a8f8
a8e8
a8d8
a8c8
a8b8

## Board State Fen
r7/6pk/1rb4p/p7/8/RBP2P2/6PP/R5K1 b - - 6 23
assistant
b6b5