r4b2/qn2p1kr/p4pp1/1Ppp4/2PPPP2/R5KN/1P3BPP/1N1Q1B1R b - - 0 21
FEN state: r4b2/qn2p1kr/p4pp1/1Ppp4/2PPPP2/R5KN/1P3BPP/1N1Q1B1R b - - 0 21 ; Best move: d5e4
The current state of the chess board is: Black rook at a8 and black bishop at f8. Black queen at a7, black knight at b7, black pawn at e7, black king at g7 and black rook at h7. Black pawn at a6, black pawn at f6 and black pawn at g6. White pawn at b5, black pawn at c5 and black pawn at d5. White pawn at c4, white pawn at d4, white pawn at e4 and white pawn at f4. White rook at a3, white king at g3 and white knight at h3. White pawn at b2, white bishop at f2, white pawn at g2 and white pawn at h2. White knight at b1, white queen at d1, white bishop at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 0. Full move number is 21. Black to move.