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
c3c4
e3e4
b4a4
b4b1
b4b2
b4b3
b4c4
b4b7
b4b6
b4b5
d4a7
d4b6
d4c5
d4f6
d4e5
f4g3
g4g5
h4h5

## Board State Fen
2b5/1p4p1/p1r2pkp/P2p4/1R1B1KPP/2P1PP2/8/8 w - - 18 41
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
c3c4
e3e4
b4a4
b4b1
b4b2
b4b3
b4c4
b4b7
b4b6
b4b5
d4a7
d4b6
d4c5
d4f6
d4e5
f4g3
g4g5
h4h5

## Board State Fen
2b5/1p4p1/p1r2pkp/P2p4/1R1B1KPP/2P1PP2/8/8 w - - 18 41
assistant
e3e4