rnb1k3/2pq1pb1/pp2pn2/1P1P3p/3P2r1/N1P2PpP/P2KN1P1/R1BQ1BR1 w q - 3 20
FEN state: rnb1k3/2pq1pb1/pp2pn2/1P1P3p/3P2r1/N1P2PpP/P2KN1P1/R1BQ1BR1 w q - 3 20 ; Best move: d5e6
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8 and black king at e8. Black pawn at c7, black queen at d7, black pawn at f7 and black bishop at g7. Black pawn at a6, black pawn at b6, black pawn at e6 and black knight at f6. White pawn at b5, white pawn at d5 and black pawn at h5. White pawn at d4 and black rook at g4. White knight at a3, white pawn at c3, white pawn at f3, black pawn at g3 and white pawn at h3. White pawn at a2, white king at d2, white knight at e2 and white pawn at g2. White rook at a1, white bishop at c1, white queen at d1, white bishop at f1 and white rook at g1. Black queenside is the only castle move available. Half move number is 3. Full move number is 20. White to move.