r1b1kb1r/p2pppp1/npp4p/q7/PP2P1P1/B1PP4/3KP2P/RN1Q1BNR w kq - 0 10
FEN state: r1b1kb1r/p2pppp1/npp4p/q7/PP2P1P1/B1PP4/3KP2P/RN1Q1BNR w kq - 0 10 ; Best move: b4a5
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at a7, black pawn at d7, black pawn at e7, black pawn at f7 and black pawn at g7. Black knight at a6, black pawn at b6, black pawn at c6 and black pawn at h6. Black queen at a5. White pawn at a4, white pawn at b4, white pawn at e4 and white pawn at g4. White bishop at a3, white pawn at c3 and white pawn at d3. White king at d2, white pawn at e2 and white pawn at h2. White rook at a1, white knight at b1, white queen at d1, white bishop at f1, white knight at g1 and white rook at h1. Black kingside and black queenside castles are available. Half move number is 0. Full move number is 10. White to move.