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
a2a4
a2a3
g1h2
g1h1
f1h2
d1a1
d1b1
d1c1
d1e1
c2b1
c2a4
c2b3
c2d3
c2c1
d2e2
d2d6
d2d5
d2d4
d2d3
f2f4
f2f3
g2f3
g2h1
c3b1
c3b5
c3d5
c3a4
c3e2
e3c5
e3d4
e3h6
e3g5
e3f4
g3g4
h3h4
e4e5

## Board State Fen
2rr2k1/1bq1bpp1/p1nppn1p/2p5/2P1P3/2N1B1PP/PPQR1PB1/3R1NK1 w - - 4 20
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
a2a4
a2a3
g1h2
g1h1
f1h2
d1a1
d1b1
d1c1
d1e1
c2b1
c2a4
c2b3
c2d3
c2c1
d2e2
d2d6
d2d5
d2d4
d2d3
f2f4
f2f3
g2f3
g2h1
c3b1
c3b5
c3d5
c3a4
c3e2
e3c5
e3d4
e3h6
e3g5
e3f4
g3g4
h3h4
e4e5

## Board State Fen
2rr2k1/1bq1bpp1/p1nppn1p/2p5/2P1P3/2N1B1PP/PPQR1PB1/3R1NK1 w - - 4 20
assistant
f2f4