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
a4c2
a4b3
a4b5
a4a2
a4a3
a4c4
a4b4
a4a6
a4a5
d4d3
e5d3
e5d7
e5f3
e5c4
e5g4
c6b4
c6b8
c6d8
c6a5
c6e7
e6d5
e6c8
e6d7
e6g4
e6f5
a7a5
a7a6
b7b5
b7b6
f7f5
f7f6
g7f6
g7h6
g7h8
h7h5
h7h6
a8e8
a8d8
a8c8
a8b8
f8b8
f8c8
f8d8
f8e8
g8h8

## Board State Fen
r4rk1/pp3pbp/2n1b1p1/2NNn1B1/q2pP1P1/5P2/PPB4P/R2Q1RK1 b - - 7 19
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
a4c2
a4b3
a4b5
a4a2
a4a3
a4c4
a4b4
a4a6
a4a5
d4d3
e5d3
e5d7
e5f3
e5c4
e5g4
c6b4
c6b8
c6d8
c6a5
c6e7
e6d5
e6c8
e6d7
e6g4
e6f5
a7a5
a7a6
b7b5
b7b6
f7f5
f7f6
g7f6
g7h6
g7h8
h7h5
h7h6
a8e8
a8d8
a8c8
a8b8
f8b8
f8c8
f8d8
f8e8
g8h8

## Board State Fen
r4rk1/pp3pbp/2n1b1p1/2NNn1B1/q2pP1P1/5P2/PPB4P/R2Q1RK1 b - - 7 19
assistant
a4b5