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
c3b3
c3c1
c3c2
c3g3
c3f3
c3e3
c3d3
c3c8
c3c7
c3c6
c3c5
c3c4
d5e6
d5e4
d5d6
d5d4
d5c6
g6g5
f7f6

## Board State Fen
8/1R3p2/6p1/p2k1p1p/P2P1P1P/1Pr3P1/5K2/8 b - - 1 40
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
c3b3
c3c1
c3c2
c3g3
c3f3
c3e3
c3d3
c3c8
c3c7
c3c6
c3c5
c3c4
d5e6
d5e4
d5d6
d5d4
d5c6
g6g5
f7f6

## Board State Fen
8/1R3p2/6p1/p2k1p1p/P2P1P1P/1Pr3P1/5K2/8 b - - 1 40
assistant
d5d4