rnb1kbr1/1p1ppnpp/1q6/1Bp1P3/1p4PP/N4p1R/PBPP1P2/R2Q1KN1 w q - 0 12
FEN state: rnb1kbr1/1p1ppnpp/1q6/1Bp1P3/1p4PP/N4p1R/PBPP1P2/R2Q1KN1 w q - 0 12 ; Best move: a1b1
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at b7, black pawn at d7, black pawn at e7, black knight at f7, black pawn at g7 and black pawn at h7. Black queen at b6. White bishop at b5, black pawn at c5 and white pawn at e5. Black pawn at b4, white pawn at g4 and white pawn at h4. White knight at a3, black pawn at f3 and white rook at h3. White pawn at a2, white bishop at b2, white pawn at c2, white pawn at d2 and white pawn at f2. White rook at a1, white queen at d1, white king at f1 and white knight at g1. Black queenside is the only castle move available. Half move number is 0. Full move number is 12. White to move.