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
c2b1
c2a4
c2b3
c2d1
c2c1
c2e2
c2d2
c3b1
c3b5
c3d1
c3d5
c3a4
c3e2
c3e4
h2h4
h2h3
f2f3
a2a4
a2a3
g1h1
e1a1
e1b1
e1c1
e1d1
e1e2
d3a6
d3b5
d3c4
d3e2
d3h7
d3g6
d3f5
d3e4
e3e4
g3h4
f4e2
f4e6
f4g6
f4d5
f4h3
f4h5

## Board State Fen
r1bqrbk1/1p3pp1/n1pn3p/p2p4/3P1N2/2NBP1B1/PPQ2PPP/4RRK1 w - - 2 15
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
c2b1
c2a4
c2b3
c2d1
c2c1
c2e2
c2d2
c3b1
c3b5
c3d1
c3d5
c3a4
c3e2
c3e4
h2h4
h2h3
f2f3
a2a4
a2a3
g1h1
e1a1
e1b1
e1c1
e1d1
e1e2
d3a6
d3b5
d3c4
d3e2
d3h7
d3g6
d3f5
d3e4
e3e4
g3h4
f4e2
f4e6
f4g6
f4d5
f4h3
f4h5

## Board State Fen
r1bqrbk1/1p3pp1/n1pn3p/p2p4/3P1N2/2NBP1B1/PPQ2PPP/4RRK1 w - - 2 15
assistant
a2a3