r1b1kb2/6pr/p2qp1Np/2ppP2n/p4PpP/2PRP3/1P6/1NBQKB1R w q - 1 20
FEN state: r1b1kb2/6pr/p2qp1Np/2ppP2n/p4PpP/2PRP3/1P6/1NBQKB1R w q - 1 20 ; Best move: e5d6
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8 and black bishop at f8. Black pawn at g7 and black rook at h7. Black pawn at a6, black queen at d6, black pawn at e6, white knight at g6 and black pawn at h6. Black pawn at c5, black pawn at d5, white pawn at e5 and black knight at h5. Black pawn at a4, white pawn at f4, black pawn at g4 and white pawn at h4. White pawn at c3, white rook at d3 and white pawn at e3. White pawn at b2. White knight at b1, white bishop at c1, white queen at d1, white king at e1, white bishop at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 1. Full move number is 20. White to move.