rn2k2r/p4p2/bp2P1pp/P7/1bpn1p1N/2N3P1/2PK3P/R1B1QB1R w q - 4 20
FEN state: rn2k2r/p4p2/bp2P1pp/P7/1bpn1p1N/2N3P1/2PK3P/R1B1QB1R w q - 4 20 ; Best move: e1e5
The current state of the chess board is: Black rook at a8, black knight at b8, black king at e8 and black rook at h8. Black pawn at a7 and black pawn at f7. Black bishop at a6, black pawn at b6, white pawn at e6, black pawn at g6 and black pawn at h6. White pawn at a5. Black bishop at b4, black pawn at c4, black knight at d4, black pawn at f4 and white knight at h4. White knight at c3 and white pawn at g3. White pawn at c2, white king at d2 and white pawn at h2. White rook at a1, white bishop at c1, white queen at e1, white bishop at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 4. Full move number is 20. White to move.