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
b2b4
b2b3
f1a6
f1b5
f1c4
f1d3
f1e2
h2h4
h2h3
d4d5
e4d2
e4d6
e4f6
e4c3
e4c5
e4g3
e4g5
g2g4
g2g3
f2f4
f2f3
c2c4
c2c3
a2a4
a2a3
g1f3
g1h3
g1e2
e1e2
e1d2
c1h6
c1g5
c1f4
c1e3
c1d2
d1h5
d1g4
d1f3
d1e2
d1d3
d1d2
a1b1

## Board State Fen
rnbqkb1r/pp2pppp/2p2n2/8/3PN3/8/PPP2PPP/R1BQKBNR w KQkq - 1 5
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
b2b4
b2b3
f1a6
f1b5
f1c4
f1d3
f1e2
h2h4
h2h3
d4d5
e4d2
e4d6
e4f6
e4c3
e4c5
e4g3
e4g5
g2g4
g2g3
f2f4
f2f3
c2c4
c2c3
a2a4
a2a3
g1f3
g1h3
g1e2
e1e2
e1d2
c1h6
c1g5
c1f4
c1e3
c1d2
d1h5
d1g4
d1f3
d1e2
d1d3
d1d2
a1b1

## Board State Fen
rnbqkb1r/pp2pppp/2p2n2/8/3PN3/8/PPP2PPP/R1BQKBNR w KQkq - 1 5
assistant
e4f6