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
b7a7
b7b4
b7b5
b7b6
b7f7
b7e7
b7d7
b7c7
b7b8
a6a7
g2h3
g2h2
g2h1
g2g1
g2f3
g2f1
g3g4

## Board State Fen
8/1R3p2/P5p1/4k2p/1bp4P/6P1/4rPK1/8 w - - 0 42
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
b7a7
b7b4
b7b5
b7b6
b7f7
b7e7
b7d7
b7c7
b7b8
a6a7
g2h3
g2h2
g2h1
g2g1
g2f3
g2f1
g3g4

## Board State Fen
8/1R3p2/P5p1/4k2p/1bp4P/6P1/4rPK1/8 w - - 0 42
assistant
b7b4