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
b1a1
b1e1
b1d1
b1c1
b1b6
b1b5
b1b4
b1b3
b1b2
f1c1
f1d1
f1e1
f1g1
h1g1
a3c1
a3b2
a3d6
a3c5
a3b4
a3b3
a3a5
a3a4
d3d4
e3c1
e3d2
e3b6
e3c5
e3d4
f3e1
f3e5
f3g1
f3g5
f3d2
f3d4
f3h4
c4c5
f4e5
f4f5

## Board State Fen
4rrk1/p1p3pp/1p1p1n2/n3p3/2P2P2/Q1PPBN1q/P3PP1P/1R3R1K 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
b1a1
b1e1
b1d1
b1c1
b1b6
b1b5
b1b4
b1b3
b1b2
f1c1
f1d1
f1e1
f1g1
h1g1
a3c1
a3b2
a3d6
a3c5
a3b4
a3b3
a3a5
a3a4
d3d4
e3c1
e3d2
e3b6
e3c5
e3d4
f3e1
f3e5
f3g1
f3g5
f3d2
f3d4
f3h4
c4c5
f4e5
f4f5

## Board State Fen
4rrk1/p1p3pp/1p1p1n2/n3p3/2P2P2/Q1PPBN1q/P3PP1P/1R3R1K w - - 2 18
assistant
c4c5