r3qbnr/pbp3pp/2n1k3/1pp2p2/1PN1p1PP/2BP1N2/P1RKPP2/4QBR1 b - - 1 21
FEN state: r3qbnr/pbp3pp/2n1k3/1pp2p2/1PN1p1PP/2BP1N2/P1RKPP2/4QBR1 b - - 1 21 ; Best move: e4f3
The current state of the chess board is: Black rook at a8, black queen at e8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at a7, black bishop at b7, black pawn at c7, black pawn at g7 and black pawn at h7. Black knight at c6 and black king at e6. Black pawn at b5, black pawn at c5 and black pawn at f5. White pawn at b4, white knight at c4, black pawn at e4, white pawn at g4 and white pawn at h4. White bishop at c3, white pawn at d3 and white knight at f3. White pawn at a2, white rook at c2, white king at d2, white pawn at e2 and white pawn at f2. White queen at e1, white bishop at f1 and white rook at g1. Both players have exhausted their castles. Half move number is 1. Full move number is 21. Black to move.