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
a1g1
a1f1
a1e1
a1d1
a1c1
a1b1
a1a6
a1a5
a1a4
a1a3
a1a2
b2b4
b2b3
h1b1
h1c1
h1d1
h1e1
h1f1
h1g1
d2c1
d2e1
d2h6
d2g5
d2f4
d2e3
e2f2
e2f1
e2e1
e2d3
e2d1
h2h4
h2h3
c3b1
c3d1
c3d5
c3a2
c3a4
c3e4
f3f4
g4g5
b5a6
b5b6
c5b3
c5b7
c5d3
c5d7
c5a4
c5a6
c5e4
c5e6

## Board State Fen
1r1r4/1p2kppp/p2b1n2/1PNp4/2nP2P1/2N2P2/1P1BK2P/R6R w - - 1 21
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
a1g1
a1f1
a1e1
a1d1
a1c1
a1b1
a1a6
a1a5
a1a4
a1a3
a1a2
b2b4
b2b3
h1b1
h1c1
h1d1
h1e1
h1f1
h1g1
d2c1
d2e1
d2h6
d2g5
d2f4
d2e3
e2f2
e2f1
e2e1
e2d3
e2d1
h2h4
h2h3
c3b1
c3d1
c3d5
c3a2
c3a4
c3e4
f3f4
g4g5
b5a6
b5b6
c5b3
c5b7
c5d3
c5d7
c5a4
c5a6
c5e4
c5e6

## Board State Fen
1r1r4/1p2kppp/p2b1n2/1PNp4/2nP2P1/2N2P2/1P1BK2P/R6R w - - 1 21
assistant
g4g5