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
a4d1
a4c2
a4b3
a4e8
a4d7
a4c6
a4b5
a6c4
a6b5
a6a5
a6d6
a6c6
a6b6
f6e5
f6f5
g6g5
b7b5
b7b6
a8c8
a8b8
d8b8
d8c8
d8d4
d8d5
d8d6
d8d7
d8f8
d8e8
g8h8
g8h7
g8f8
g8f7

## Board State Fen
r2r2k1/pp4p1/q3ppp1/2P1P3/b1PB4/P1Q2P2/6PP/2R2RK1 b - - 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
a4d1
a4c2
a4b3
a4e8
a4d7
a4c6
a4b5
a6c4
a6b5
a6a5
a6d6
a6c6
a6b6
f6e5
f6f5
g6g5
b7b5
b7b6
a8c8
a8b8
d8b8
d8c8
d8d4
d8d5
d8d6
d8d7
d8f8
d8e8
g8h8
g8h7
g8f8
g8f7

## Board State Fen
r2r2k1/pp4p1/q3ppp1/2P1P3/b1PB4/P1Q2P2/6PP/2R2RK1 b - - 0 21
assistant
f6f5