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
b6a6
b6b1
b6b2
b6b3
b6b4
b6b5
b6f6
b6e6
b6d6
b6c6
b6b7
a1f1
a1e1
a1d1
a1c1
a1b1
a1a3
a1a2
a4a5
f2f4
f2f3
d4c5
d4e3
d4f6
d4e5
g3g4
c3c4
g1h1
g1g2
g1f1
h2h4
h2h3
e2e4
e2e3

## Board State Fen
r5k1/1prb2pp/pR3p2/3p4/P2B4/2P3P1/4PP1P/R5K1 w - - 2 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
b6a6
b6b1
b6b2
b6b3
b6b4
b6b5
b6f6
b6e6
b6d6
b6c6
b6b7
a1f1
a1e1
a1d1
a1c1
a1b1
a1a3
a1a2
a4a5
f2f4
f2f3
d4c5
d4e3
d4f6
d4e5
g3g4
c3c4
g1h1
g1g2
g1f1
h2h4
h2h3
e2e4
e2e3

## Board State Fen
r5k1/1prb2pp/pR3p2/3p4/P2B4/2P3P1/4PP1P/R5K1 w - - 2 23
assistant
a4a5