rn2kr2/p2p1p2/bp1Q4/1N2p2p/Pp4p1/3PbPPN/2P3BP/R1B1K1R1 b q - 1 20
FEN state: rn2kr2/p2p1p2/bp1Q4/1N2p2p/Pp4p1/3PbPPN/2P3BP/R1B1K1R1 b q - 1 20 ; Best move: a6b5
The current state of the chess board is: Black rook at a8, black knight at b8, black king at e8 and black rook at f8. Black pawn at a7, black pawn at d7 and black pawn at f7. Black bishop at a6, black pawn at b6 and white queen at d6. White knight at b5, black pawn at e5 and black pawn at h5. White pawn at a4, black pawn at b4 and black pawn at g4. White pawn at d3, black bishop at e3, white pawn at f3, white pawn at g3 and white knight at h3. White pawn at c2, white bishop at g2 and white pawn at h2. White rook at a1, white bishop at c1, white king at e1 and white rook at g1. Black queenside is the only castle move available. Half move number is 1. Full move number is 20. Black to move.