2nqkb1r/7p/2rp1ppn/p6R/1pp2P2/P3P2B/RPbPQK2/2B3N1 w k - 0 20
FEN state: 2nqkb1r/7p/2rp1ppn/p6R/1pp2P2/P3P2B/RPbPQK2/2B3N1 w k - 0 20 ; Best move: a3b4
The current state of the chess board is: Black knight at c8, black queen at d8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at h7. Black rook at c6, black pawn at d6, black pawn at f6, black pawn at g6 and black knight at h6. Black pawn at a5 and white rook at h5. Black pawn at b4, black pawn at c4 and white pawn at f4. White pawn at a3, white pawn at e3 and white bishop at h3. White rook at a2, white pawn at b2, black bishop at c2, white pawn at d2, white queen at e2 and white king at f2. White bishop at c1 and white knight at g1. Black kingside is the only castle move available. Half move number is 0. Full move number is 20. White to move.