r3kb2/4ppr1/pnp1qn2/1N3Q1p/1P6/3PB2N/P1P2PPP/R1Kb1BR1 w q - 1 21
FEN state: r3kb2/4ppr1/pnp1qn2/1N3Q1p/1P6/3PB2N/P1P2PPP/R1Kb1BR1 w q - 1 21 ; Best move: b5c7
The current state of the chess board is: Black rook at a8, black king at e8 and black bishop at f8. Black pawn at e7, black pawn at f7 and black rook at g7. Black pawn at a6, black knight at b6, black pawn at c6, black queen at e6 and black knight at f6. White knight at b5, white queen at f5 and black pawn at h5. White pawn at b4. White pawn at d3, white bishop at e3 and white knight at h3. White pawn at a2, white pawn at c2, white pawn at f2, white pawn at g2 and white pawn at h2. White rook at a1, white king at c1, black bishop at d1, white bishop at f1 and white rook at g1. Black queenside is the only castle move available. Half move number is 1. Full move number is 21. White to move.