rn3bnr/1p2p1p1/p1pk1p2/1B5p/q3p2P/PQP4P/1P1P1P2/RNB1K1NR w Q - 0 12
FEN state: rn3bnr/1p2p1p1/p1pk1p2/1B5p/q3p2P/PQP4P/1P1P1P2/RNB1K1NR w Q - 0 12 ; Best move: b5a4
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at b7, black pawn at e7 and black pawn at g7. Black pawn at a6, black pawn at c6, black king at d6 and black pawn at f6. White bishop at b5 and black pawn at h5. Black queen at a4, black pawn at e4 and white pawn at h4. White pawn at a3, white queen at b3, white pawn at c3 and white pawn at h3. White pawn at b2, white pawn at d2 and white pawn at f2. White rook at a1, white knight at b1, white bishop at c1, white king at e1, white knight at g1 and white rook at h1. White queenside is the only castle move available. Half move number is 0. Full move number is 12. White to move.