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
e1a1
e1b1
e1c1
e1d1
e1f1
e1e8
e1e7
e1e6
e1e5
e1e4
e1e3
e1e2
a3a4
d4c5
d5c5
d5h5
d5g5
d5f5
d5e5
d5d8
d5d7
d5d6
g2g4
g2g3
f2f4
f2f3
g1h2
g1h1
g1f1

## Board State Fen
3r4/5pk1/1p4q1/p1pR4/3P3p/P6P/1P3PP1/4R1K1 w - - 0 45
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
e1a1
e1b1
e1c1
e1d1
e1f1
e1e8
e1e7
e1e6
e1e5
e1e4
e1e3
e1e2
a3a4
d4c5
d5c5
d5h5
d5g5
d5f5
d5e5
d5d8
d5d7
d5d6
g2g4
g2g3
f2f4
f2f3
g1h2
g1h1
g1f1

## Board State Fen
3r4/5pk1/1p4q1/p1pR4/3P3p/P6P/1P3PP1/4R1K1 w - - 0 45
assistant
d5d8