r1k3nb/2qnpp1r/pp2b2p/3p2pP/1BN3P1/1PPpPP1R/P3BK2/RQ4N1 b - - 1 21
FEN state: r1k3nb/2qnpp1r/pp2b2p/3p2pP/1BN3P1/1PPpPP1R/P3BK2/RQ4N1 b - - 1 21 ; Best move: d5c4
The current state of the chess board is: Black rook at a8, black king at c8, black knight at g8 and black bishop at h8. Black queen at c7, black knight at d7, black pawn at e7, black pawn at f7 and black rook at h7. Black pawn at a6, black pawn at b6, black bishop at e6 and black pawn at h6. Black pawn at d5, black pawn at g5 and white pawn at h5. White bishop at b4, white knight at c4 and white pawn at g4. White pawn at b3, white pawn at c3, black pawn at d3, white pawn at e3, white pawn at f3 and white rook at h3. White pawn at a2, white bishop at e2 and white king at f2. White rook at a1, white queen at b1 and white knight at g1. Both players have exhausted their castles. Half move number is 1. Full move number is 21. Black to move.