r3kn1r/1b3p1p/pQ2q3/3p2p1/1bP1p1n1/1P1P2BP/P2N2P1/R3KBNR w KQkq - 1 20
FEN state: r3kn1r/1b3p1p/pQ2q3/3p2p1/1bP1p1n1/1P1P2BP/P2N2P1/R3KBNR w KQkq - 1 20 ; Best move: b6b4
The current state of the chess board is: Black rook at a8, black king at e8, black knight at f8 and black rook at h8. Black bishop at b7, black pawn at f7 and black pawn at h7. Black pawn at a6, white queen at b6 and black queen at e6. Black pawn at d5 and black pawn at g5. Black bishop at b4, white pawn at c4, black pawn at e4 and black knight at g4. White pawn at b3, white pawn at d3, white bishop at g3 and white pawn at h3. White pawn at a2, white knight at d2 and white pawn at g2. White rook at a1, white king at e1, white bishop at f1, white knight at g1 and white rook at h1. White kingside, white queenside, black kingside and black queenside castles are available. Half move number is 1. Full move number is 20. White to move.