r2q3r/1p1bk1b1/3N1n2/p3ppp1/1PBn2pP/P1p1PPP1/1NPP4/R1B2K1R b - - 4 21
FEN state: r2q3r/1p1bk1b1/3N1n2/p3ppp1/1PBn2pP/P1p1PPP1/1NPP4/R1B2K1R b - - 4 21 ; Best move: d4f3
The current state of the chess board is: Black rook at a8, black queen at d8 and black rook at h8. Black pawn at b7, black bishop at d7, black king at e7 and black bishop at g7. White knight at d6 and black knight at f6. Black pawn at a5, black pawn at e5, black pawn at f5 and black pawn at g5. White pawn at b4, white bishop at c4, black knight at d4, black pawn at g4 and white pawn at h4. White pawn at a3, black pawn at c3, white pawn at e3, white pawn at f3 and white pawn at g3. White knight at b2, white pawn at c2 and white pawn at d2. White rook at a1, white bishop at c1, white king at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 4. Full move number is 21. Black to move.