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
a6a5
e6a2
e6b3
e6c4
e6d5
e6h3
e6g4
e6f5
b7b5
b7b6
d7c7
e7f8
e7f6
e7e8
e7d8
e7d6
f7f5
f7f6
g7g5
g7g6
h7h5
h7h6
b8a8
b8h8
b8g8
b8f8
b8e8
b8d8
b8c8

## Board State Fen
1r6/1pRrkppp/p3b3/8/1P6/P4B1P/5PP1/2R3K1 b - - 4 29
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
a6a5
e6a2
e6b3
e6c4
e6d5
e6h3
e6g4
e6f5
b7b5
b7b6
d7c7
e7f8
e7f6
e7e8
e7d8
e7d6
f7f5
f7f6
g7g5
g7g6
h7h5
h7h6
b8a8
b8h8
b8g8
b8f8
b8e8
b8d8
b8c8

## Board State Fen
1r6/1pRrkppp/p3b3/8/1P6/P4B1P/5PP1/2R3K1 b - - 4 29
assistant
b7b6