1rn1kbnr/1p1qpbpp/B1p2p2/8/P1PPp3/1P6/3BNPPP/RN1Q1KR1 w k - 0 20
FEN state: 1rn1kbnr/1p1qpbpp/B1p2p2/8/P1PPp3/1P6/3BNPPP/RN1Q1KR1 w k - 0 20 ; Best move: a6b5
The current state of the chess board is: Black rook at b8, black knight at c8, black king at e8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at b7, black queen at d7, black pawn at e7, black bishop at f7, black pawn at g7 and black pawn at h7. White bishop at a6, black pawn at c6 and black pawn at f6. White pawn at a4, white pawn at c4, white pawn at d4 and black pawn at e4. White pawn at b3. White bishop at d2, white knight at e2, white pawn at f2, white pawn at g2 and white pawn at h2. White rook at a1, white knight at b1, white queen at d1, white king at f1 and white rook at g1. Black kingside is the only castle move available. Half move number is 0. Full move number is 20. White to move.