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
g4d1
g4e2
g4f3
g4c8
g4d7
g4e6
g4f5
g4h3
g4h5
c5a5
c5b5
c5c3
c5c4
c5f5
c5e5
c5d5
c5c8
c5c7
c5c6
g5h5
g5h4
g5f4

## Board State Fen
8/8/1R6/2r3k1/6b1/2PB4/5K2/8 b - - 0 39
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
g4d1
g4e2
g4f3
g4c8
g4d7
g4e6
g4f5
g4h3
g4h5
c5a5
c5b5
c5c3
c5c4
c5f5
c5e5
c5d5
c5c8
c5c7
c5c6
g5h5
g5h4
g5f4

## Board State Fen
8/8/1R6/2r3k1/6b1/2PB4/5K2/8 b - - 0 39
assistant
c5c3