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
f2f4
f2f3
g1h1
g1g2
h2h4
h2h3
f1a6
f1b5
f1c4
f1d3
f1e2
f1h3
f1g2
a1e1
a1d1
a1c1
a1b1
a1a3
a1a2
g3g4
d4b4
d4c4
d4d1
d4d2
d4d3
d4d8
d4d7
d4d6
d4d5
e4e5

## Board State Fen
2r3k1/pp3p1p/6p1/r7/P2RP3/1b4P1/5P1P/R4BK1 w - - 0 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
f2f4
f2f3
g1h1
g1g2
h2h4
h2h3
f1a6
f1b5
f1c4
f1d3
f1e2
f1h3
f1g2
a1e1
a1d1
a1c1
a1b1
a1a3
a1a2
g3g4
d4b4
d4c4
d4d1
d4d2
d4d3
d4d8
d4d7
d4d6
d4d5
e4e5

## Board State Fen
2r3k1/pp3p1p/6p1/r7/P2RP3/1b4P1/5P1P/R4BK1 w - - 0 23
assistant
d4b4