r3k2r/2pn1ppp/8/1p2p1N1/pP2p1bP/P2P1PQ1/2P3Pn/R1BNKBb1 b kq - 4 21
FEN state: r3k2r/2pn1ppp/8/1p2p1N1/pP2p1bP/P2P1PQ1/2P3Pn/R1BNKBb1 b kq - 4 21 ; Best move: f7f5
The current state of the chess board is: Black rook at a8, black king at e8 and black rook at h8. Black pawn at c7, black knight at d7, black pawn at f7, black pawn at g7 and black pawn at h7. Black pawn at b5, black pawn at e5 and white knight at g5. Black pawn at a4, white pawn at b4, black pawn at e4, black bishop at g4 and white pawn at h4. White pawn at a3, white pawn at d3, white pawn at f3 and white queen at g3. White pawn at c2, white pawn at g2 and black knight at h2. White rook at a1, white bishop at c1, white knight at d1, white king at e1, white bishop at f1 and black bishop at g1. Black kingside and black queenside castles are available. Half move number is 4. Full move number is 21. Black to move.