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
e1c3
e1d2
e1f2
h2h4
h2h3
b3a1
b3a5
b3c1
b3c5
b3d2
b3d4
b4b5
c4b5

## Board State Fen
8/8/2nk1b1p/5p2/1PK1pPp1/1N1p2P1/7P/4B3 w - - 0 42
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
e1c3
e1d2
e1f2
h2h4
h2h3
b3a1
b3a5
b3c1
b3c5
b3d2
b3d4
b4b5
c4b5

## Board State Fen
8/8/2nk1b1p/5p2/1PK1pPp1/1N1p2P1/7P/4B3 w - - 0 42
assistant
b4b5