1r2qbnr/2p2p1p/p1kp2p1/1p1n1pBP/1P1PP1P1/PN5b/2P2PR1/R3KB2 w Q - 0 21
FEN state: 1r2qbnr/2p2p1p/p1kp2p1/1p1n1pBP/1P1PP1P1/PN5b/2P2PR1/R3KB2 w Q - 0 21 ; Best move: e1c1
The current state of the chess board is: Black rook at b8, black queen at e8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at c7, black pawn at f7 and black pawn at h7. Black pawn at a6, black king at c6, black pawn at d6 and black pawn at g6. Black pawn at b5, black knight at d5, black pawn at f5, white bishop at g5 and white pawn at h5. White pawn at b4, white pawn at d4, white pawn at e4 and white pawn at g4. White pawn at a3, white knight at b3 and black bishop at h3. White pawn at c2, white pawn at f2 and white rook at g2. White rook at a1, white king at e1 and white bishop at f1. White queenside is the only castle move available. Half move number is 0. Full move number is 21. White to move.