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
e1f2
e1d1
b2b4
b2b3
e4e5
b5a5
b5b3
b5b4
b5c5
b5b8
b5b7
b5b6
c6a8
c6b7
c6e8
c6d7

## Board State Fen
r5k1/6b1/2Bp2p1/1RpP3p/2P1P2P/8/1P3r2/4K3 w - - 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
e1f2
e1d1
b2b4
b2b3
e4e5
b5a5
b5b3
b5b4
b5c5
b5b8
b5b7
b5b6
c6a8
c6b7
c6e8
c6d7

## Board State Fen
r5k1/6b1/2Bp2p1/1RpP3p/2P1P2P/8/1P3r2/4K3 w - - 0 40
assistant
e1f2