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
a3a4
c2c4
c2c3
h1e1
h1f1
h1g1
b3a2
b3a4
b3f7
b3e6
b3d5
b3c4
f3f4
b4a5
b4e1
b4d2
b4c3
b4f8
b4e7
b4d6
b4c5
b4a4
b4d4
b4c4
b4b7
b4b6
b4b5
h2h4
h2h3
b2a1
b2d4
b2c3
d1g1
d1f1
d1e1
d1d4
d1d3
d1d2
c1d2
c1b1

## Board State Fen
2r3kr/1bq2np1/5p2/4p3/1Q1pP3/PB3P2/1BP4P/2KR3R w - - 4 23
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
a3a4
c2c4
c2c3
h1e1
h1f1
h1g1
b3a2
b3a4
b3f7
b3e6
b3d5
b3c4
f3f4
b4a5
b4e1
b4d2
b4c3
b4f8
b4e7
b4d6
b4c5
b4a4
b4d4
b4c4
b4b7
b4b6
b4b5
h2h4
h2h3
b2a1
b2d4
b2c3
d1g1
d1f1
d1e1
d1d4
d1d3
d1d2
c1d2
c1b1

## Board State Fen
2r3kr/1bq2np1/5p2/4p3/1Q1pP3/PB3P2/1BP4P/2KR3R w - - 4 23
assistant
b4b5