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
b1a1
b1e1
b1d1
b1c1
b1b8
b1b7
b1b6
b1b5
b1b4
b1b3
b1b2
g1h1
g1g2
f1g2
a2a4
a2a3
d2d3
h2h4
h2h3
f3f4
g3g4

## Board State Fen
2k5/p1p2ppp/4r3/8/3r4/5PP1/P2P1P1P/1R3KR1 w - - 0 20
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
b1a1
b1e1
b1d1
b1c1
b1b8
b1b7
b1b6
b1b5
b1b4
b1b3
b1b2
g1h1
g1g2
f1g2
a2a4
a2a3
d2d3
h2h4
h2h3
f3f4
g3g4

## Board State Fen
2k5/p1p2ppp/4r3/8/3r4/5PP1/P2P1P1P/1R3KR1 w - - 0 20
assistant
b1b2