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
a1b1
c1h6
c1g5
c1f4
c1e3
c1d2
a2a4
a2a3
b2b4
b2b3
f2g1
f2f1
f2e3
f2e2
f2e1
g2f4
g2h4
g2e1
g2e3
h2h4
h2h3
c3c4
d3b1
d3c2
d3a6
d3b5
d3c4
d3f1
d3e2
d3g6
d3f5
d3e4
f3f4
g3g4

## Board State Fen
4r1k1/pp3p1p/2pbb1p1/3p3n/3P4/2PB1PP1/PP3KNP/R1B5 w - - 0 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
a1b1
c1h6
c1g5
c1f4
c1e3
c1d2
a2a4
a2a3
b2b4
b2b3
f2g1
f2f1
f2e3
f2e2
f2e1
g2f4
g2h4
g2e1
g2e3
h2h4
h2h3
c3c4
d3b1
d3c2
d3a6
d3b5
d3c4
d3f1
d3e2
d3g6
d3f5
d3e4
f3f4
g3g4

## Board State Fen
4r1k1/pp3p1p/2pbb1p1/3p3n/3P4/2PB1PP1/PP3KNP/R1B5 w - - 0 21
assistant
a2a4