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
a6b5
a6a5
c6b6
c6c3
c6c4
c6c5
c6c7
d6d5
e6f7
e6f6
e6f5
e6e7
e6d7
e6d5
g6g5
c8a8
c8b8
c8c7
c8h8
c8g8
c8f8
c8e8
c8d8

## Board State Fen
2r5/8/p1rpk1p1/1P2p2p/4R2P/2PK1P2/1P1R2P1/8 b - - 0 31
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
a6b5
a6a5
c6b6
c6c3
c6c4
c6c5
c6c7
d6d5
e6f7
e6f6
e6f5
e6e7
e6d7
e6d5
g6g5
c8a8
c8b8
c8c7
c8h8
c8g8
c8f8
c8e8
c8d8

## Board State Fen
2r5/8/p1rpk1p1/1P2p2p/4R2P/2PK1P2/1P1R2P1/8 b - - 0 31
assistant
a6b5