r1q4r/p1p1k1pR/np1p4/1RPb1P2/2P2pn1/P2P1P2/4P3/1NBK1BN1 b - - 0 21
FEN state: r1q4r/p1p1k1pR/np1p4/1RPb1P2/2P2pn1/P2P1P2/4P3/1NBK1BN1 b - - 0 21 ; Best move: h8h7
The current state of the chess board is: Black rook at a8, black queen at c8 and black rook at h8. Black pawn at a7, black pawn at c7, black king at e7, black pawn at g7 and white rook at h7. Black knight at a6, black pawn at b6 and black pawn at d6. White rook at b5, white pawn at c5, black bishop at d5 and white pawn at f5. White pawn at c4, black pawn at f4 and black knight at g4. White pawn at a3, white pawn at d3 and white pawn at f3. White pawn at e2. White knight at b1, white bishop at c1, white king at d1, white bishop at f1 and white knight at g1. Both players have exhausted their castles. Half move number is 0. Full move number is 21. Black to move.