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
a1b1
c1a3
c1b2
d1e2
d1f1
d1e1
g1h1
g1f1
a2a4
a2a3
c2b1
c2a4
c2b3
d2c4
d2e4
d2b1
d2b3
d2f1
g2g4
g2g3
c3c4
d3d4
f3e1
f3e5
f3g5
f3d4
f3h2
f3h4
h3h4
b5b6

## Board State Fen
4r1k1/pppq1ppp/3b4/nP1n3b/8/2PP1N1P/P1BN1PP1/R1BQ2K1 w - - 2 18
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
a1b1
c1a3
c1b2
d1e2
d1f1
d1e1
g1h1
g1f1
a2a4
a2a3
c2b1
c2a4
c2b3
d2c4
d2e4
d2b1
d2b3
d2f1
g2g4
g2g3
c3c4
d3d4
f3e1
f3e5
f3g5
f3d4
f3h2
f3h4
h3h4
b5b6

## Board State Fen
4r1k1/pppq1ppp/3b4/nP1n3b/8/2PP1N1P/P1BN1PP1/R1BQ2K1 w - - 2 18
assistant
d2e4