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
c5b3
c5b7
c5d3
c5d7
c5a4
c5e4
c5e6
c6b6
c6g6
c6f6
c6e6
c6d6
c7a7
c7b7
c7f7
c7e7
c7d7
c7c8
g7g5
g7g6
g8h8
g8h7

## Board State Fen
6k1/2r3p1/p1r4p/R1n2R1P/2P3P1/P4P2/4PK2/8 b - - 0 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
c5b3
c5b7
c5d3
c5d7
c5a4
c5e4
c5e6
c6b6
c6g6
c6f6
c6e6
c6d6
c7a7
c7b7
c7f7
c7e7
c7d7
c7c8
g7g5
g7g6
g8h8
g8h7

## Board State Fen
6k1/2r3p1/p1r4p/R1n2R1P/2P3P1/P4P2/4PK2/8 b - - 0 40
assistant
c5b7